Botany Commons^™

Functional Characterization Of Haloarchaeal Udp-Glucose 4-Epimerase And 3-Hydroxybutyryl-Coa Dehydrogenase Genes In Nicotiana Tabacum, Çi̇ğdem Otur, Sezer Okay, Aslihan Kurt Kizildoğan

Turkish Journal of Botany

The objective of the studyAbiotic stress poses a significant threat to plant survival. In response to the challenging conditions, plants have evolved various resistance mechanisms. Recently, genetic strategies have become increasingly prevalent in efforts to enhance abiotic stress tolerance and develop stress-resistant plant varieties. In this study, we employed heterologous expression of two metabolism-related haloarchaeal genes in the Nicotiana tabacum genome to improve its mechanism for salt and drought tolerance.Experimental procedure(s)The U2642 and CL165 genes encoding 3-hydroxybutyryl-CoA dehydrogenase and UDP-glucose 4-epimerase, respectively, were subcloned into the pIPKb004 vector under the control of Cauliflower mosaic virus 35S (CaMV35S) promoter using the …

Investigation And Computational Analysis Of The Iqd Gene Family In Common Bean (Phaseolus Vulgaris L.): Expression Profiling Under Salt Stress, Tarik Kirlioğlu, Aybüke Okay, Emi̇ne Sümer Aras, İlker Büyük

Turkish Journal of Botany

Common bean is one of the most nutritionally important legumes because of its high-quality protein content. While its genome has been widely studied however, the IQD gene family has not been extensively investigated in common bean to date. The IQD proteins (IQ-67 domain), a type of calmodulin-binding protein, are involved in plant growth and development, as well as the plant's response to environmental stressors. In this study, thirty-six PvIQD genes were discovered and their proteins were found to be classified into four groups according to the phylogenetic tree. The proteins which are encoded by PvIQD genes with similar exon-intron pattern …

Primary Distribution And Rt-Pcr-Based Detection Of Citrus Dwarfing Viroid (Cdvd) In Citrus Cultivars Of Pakistan, Zia Ul Haq, Amjad Ali, Syed A.H. Naqvi, Faheem Shehzad Baloch, Ummad U.D. Umar

Turkish Journal of Botany

Viroid diseases have emerged as a significant threat to citrus orchards globally. In Pakistan, viroid infections have rapidly spread across different citrus cultivar, posing serious challenges to the survival of orchards. This study encompasses the determination of the prevalence and detection of Citrus dwarfing viroid (CDVd) in both reported and newly introduced citrus cultivars in Pakistan using RT-PCR. RNA was extracted from 122 infected citrus samples and examined for the presence of viroids following the successful optimization of newly designed CDVd primers (CDVd AF1/AR1). This led to the confirmation of CDVd in 72 samples (59.01%).. Biological indexing was performed using …

Innovations In Plant Genome Editing And Biotechnology: Addressing Global Agricultural Challenges, Bayram Ali̇ Yerli̇kaya, Karam Mostafa, Abdullah Aydin, Seher Yerli̇kaya, Momna Mehmood, Ni̇sa Nur Yilmaz, Kubi̇lay Yildirim, Musa Kavas

Turkish Journal of Botany

Developments in genome editing and plant biotechnology in recent years, especially CRISPR-Cas9 and RNA interference (RNAi) technologies, offer essential tools for solving global agricultural problems that are worsened by climate change and the increasing food demand caused by the rising world population. This review focuses on the urgent need to feed a growing global population. It explores how key biotechnological tools can enhance crop resilience and nutritional quality amid climate variability and extreme weather. The applicability of CRISPR-Cas technologies in the development of climate-friendly, more nutritious, and higher-yielding crops has opened a biotechnological avenue for the development of both transgenic …

Advancements In Qtl Mapping And Gwas Application In Plant Improvement, Muhammad Tanveer Altaf, Muhammed Tatar, Amjad Ali, Waqas Liaqat, Parnaz Mortazvi, Ceyhun Kayihan, Fati̇h Ölmez, Muhammad Azhar Nadeem, Jazib Javed, Jin-Ying Gou, Meng-Lu Wang, Ummad Ud Din Umar, Hayri̇ye Yildiz Daşgan, Cemal Kurt, Mehtap Yildiz, Sheikh Mansoor, Abdelfattah A. Dababat, Nafiz Çeli̇ktaş, Faheem Shehzad Baloch

Turkish Journal of Botany

Molecular markers play a crucial role in modern plant breeding by enabling the precise identification of genetic loci associated with important agronomic traits. This article focuses on the advancements in Quantitative Trait Locus (QTL) mapping and Genome-Wide Association Studies (GWAS), which are pivotal in identifying and dissecting complex traits such as stress tolerance, yield improvement, and nutrient efficiency. Through QTL mapping, significant genetic regions linked to desired traits are identified, while GWAS leverages larger populations for higher resolution in genetic association studies. The integration of next-generation sequencing, CRISPR, and transcriptomics technologies has revolutionized the precision and efficiency of these methods, …

Identification Of Genes Associated With Zinc And Copper Concentrations In Walnut (Juglans Regia L.) By Gwas Analysis, Berfi̇n Nazlican Kaman, Bülent Yağmur, Erdal Orman, Muhammed Bahatti̇n Tanyolaç, Duygu Ateş

Turkish Journal of Botany

154 walnut genotypes from various geographic regions were analyzed in the study. Micronutrient concentrations of zinc (Zn) ranged from 1.61 to 8.98 mg/100 g, and the concentrations of copper (Cu) varied between 0.12 and 0.38 mg/100 g. 16,473 SNPs were generated using Diversity Array Technology (DArT) for genome-wide association (GWAS) studies. The Mixed Linear Model (MLM) utilizing the Q + K model revealed seven associated markers for the element Zn in 2021 and four in 2022. The MLM (Q + K) model indicated two associated markers for the element Cu in 2021 and three in 2022. The markers found in …

Genome-Wide Identification And Characterization Of The Lea Gene Family In Common Bean And The Role Of The Dehydrin Gene Pvhdn3 In Enhancing Salt And Drought Tolerance In Transgenic Tobacco Plant., Gökhan Gökdemi̇r, Zafer Seçgin, Karam Mostafa, Mohamed Farah Abdulla, Musa Kavas

Turkish Journal of Botany

Global climate change exposes crops to numerous abiotic and biotic stress factors, significantly threatening their growth, development, and overall productivity. Among the various abiotic stresses, salt and drought are the most detrimental, having a severe impact on yield stability. Late Embryogenesis Abundant proteins (LEA) represent a broad and varied class of polypeptides that accumulate in response to cellular dehydration across diverse organisms. Nonetheless, there has been a scarcity of studies on this protein family in common beans prior to this investigation. In this study, we identified 69 members of the LEA gene family in common bean, characterized by conserved LEA …

Gene Expression Changes In The Seagrass Cymodocea Nodosa Individuals In Response To Aquatic Acidification, Enes Göksal, Esra Öztürk Yi̇ği̇t

Turkish Journal of Botany

Human activities have caused a rise in atmospheric carbon dioxide (CO2) levels, leading to greater absorption of CO2 by oceans and causing ocean acidification. This phenomenon, marked by a reduction in pH, represents substantial risks to marine ecosystems, including seagrass meadows. Seagrasses are vital elements of coastal ecosystems, performing important functions in carbon storage, stabilizing shorelines, and preserving biodiversity; however, reactions to ocean acidification are not well understood, especially in terms of molecular.This research study examined alterations in gene expression within seagrass meadows, namely the species Cymodocea nodosa, in reaction to simulated ocean acidification conditions. Climate chamber system to adjust …

Phylogenomics Of The Tribe Leonureae Reveals A New Genus: Paraleonurus (Lamiaceae, Lamioideae), Mei-Lin Qian, Ya-Ping Chen, Tuncay Di̇rmenci̇, Yue Zhao, Guo-Xiong Hu, Fei Zhao, Ferhat Celep, Bo Li, Chunlei Xiang

Turkish Journal of Botany

With approximately 80 species across six genera (Leonurus, Lagopsis, Panzerina, Lagochilus, Chaiturus, and Loxocalyx), the tribe Leonureae represents one of the most morphologically diverse tribes within the subfamily Lamioideae of Lamiaceae. Previous studies indicated that Leonurus and Lagopsis are not monophyletic, and relationships among and within these genera remain unclear due to limited sampling and DNA markers. In this study, we present the most comprehensive phylogenomic analyses of Leonureae based on complete plastome sequences and 127 nuclear loci retrieved from next-generation sequencing data. Our results provide strong evidence for the monophyly of Leonureae, which can be further divided into six …

Selective Indel Marker Identification Across The Peanut (Arachis Hypogaea L.) Genome Using Ddradseq, Moin Qureshi, Bi̇rgül Guden, Hi̇lal Şule Tosun, Mojtaba Kordrostami, Sunil Shiwaji Gangurde, Bülent Uzun, Engi̇n Yol

Turkish Journal of Botany

The advent of next-generation sequencing technologies, mainly double digest restriction site-associated DNA sequencing (ddRADSeq), has significantly advanced the development of molecular markers for crop genetics. This study used ddRADSeq to identify and develop insertion-deletion (InDel) markers in 25 peanut genotypes from diverse geographic regions. The bioinformatic analysis unveiled 62728 InDels across the peanut genome, predominantly between 1-5 bp, which constituted 96% of the total, while InDels of ≥ 6 bp accounted for 3.96%. We focused on 1013 InDels of at least 10 bp for further analysis, representing 1.61% of the total reads, with a distribution of 832 insertions and 181 …

Exploring The Population Structure And Genetic Diversity In Apple Germplasm Using Ipbs-Retrotransposon Markers, Aigul Madenova, Angsagan Kuan, Amjad Ali, Muhammad Azhar Nadeem, Muhammad Tanveer Altaf, Balnur Kabylbekova, Dinara Kaldybaeva, Ti̇mur Turdi̇yev, Faheem Shahzad Baloch

Turkish Journal of Botany

The apple (Malus domestica [Suckow] Borkh) is economically and culturally significant worldwide, thriving in temperate regions. This study examined genetic variations among 52 apple accessions from three research centers in Kazakhstan using the iPBS-retrotransposons marker system. Out of 35 screened markers, 12 highly polymorphic markers were selected for PCR amplification, resulting in 280 bands, 279 of which were polymorphic, yielding a 99.64% polymorphism rate. Genetic diversity indices showed substantial variation: effective number of alleles (ne=1.655), Shannon's information index (I=0.373), gene diversity (h=0.549), and an average genetic distance of 1.2. The analysis of molecular variance (AMOVA) indicated that 98.80% of the …

Heterologous Expression Of Haloarchaeal Transporter Genes In Nicotiana Tabacum Under Salt And Drought Stresses, Çi̇ğdem Otur, Musa Kavas, Aslihan Kurt Kizildoğan

Turkish Journal of Botany

The objective of the study: Climate change and human activities impose severe biotic and abiotic stresses that threaten plant survival. To cope with these extreme conditions, plants have evolved various resistance mechanisms. In recent years, genetic approaches have been increasingly employed to enhance abiotic stress tolerance and develop stress-resistant plants. In this study, we introduced three transporter-related genes from extreme haloarchaea, which thrive in saturated NaCl environments, into the Nicotiana tabacum genome to improve its salt and drought tolerance mechanisms.E xperimental procedure(s) : The U2845, U3508, and CL165 genes were subcloned into the pIPKb004 vector, which includes the cauliflower mosaic …

Role Of Sulfur Metabolism In Acquiring Of Boron Tolerance In Arabidopsis Thaliana, Seda Yi̇rmi̇beş, Ceyhun Kayihan, Nuran Çi̇çek, Yasemi̇n Ekmekçi̇

Turkish Journal of Botany

The purpose of this study was to assess whether sulfate applications (pre- and combined) caused the changes of tolerance against boron (B) toxicity in Arabidopsis thaliana at physiological, biochemical and molecular levels. Plants were germinated and grown on MS medium for 12 days, and then, sulfate pre-treatment groups (PS-B) were transferred to sulfate-containing media for 3 days. Subsequently, PS-B, combined (S+B) and un-treated application groups were transferred to medium containing 3 and 5 mM B for 10 days. Leaf area, plant biomass and total chlorophyll content decreased significantly depending on the accumulation of B. Toxic levels of B adversely affected …

Roquea, A New Genus Of Lychnophorinae (Vernonieae, Asteraceae) From Brazil And Its Phylogenetic Placement, Benoit Loeuille, Roberto Baptista Pereira Almeida, Carolina Moriani Siniscalchi, Makeli G. Lusa, Guilherme Medeiros Antar

UL Publications

Lychnophorinae (Vernonieae, Asteraceae) consists of 21 genera and approximately 150 species, primarily distributed in the Brazilian Central Plateau, with several novelties recently described. With new botanical expeditions conducted in Serra da Formosa, state of Minas Gerais, a set of collections that belong to Lychnophorinae but were not easily assigned to a genus was discovered. After morphological and anatomical analyses and phylogenetic studies, we describe and illustrate Roquea, a new genus of Asteraceae from Brazil, to accommodate the new species Roquea multiserialis. Affinities of the new genus with other genera of Lychnophorinae are discussed along with a preliminary conservation …

Leveraging Within-Field Spatial Variability To Optimize Soybean Yield, Seed Quality, And Profitability, Marina Marly Dalla Betta

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Optimizing yield and seed quality in soybean production is critical for both profitability and meeting market demands. However, within-field variability in soil properties poses a challenge in determining optimal management strategies to maximize soybean yield, seed quality, and profitability. This work aimed to evaluate the spatial variability of soybean fields to optimize soybean seeding rates, seed quality, and profitability. Two case studies were used to carry over this research. The first study looked at the optimal economical site-specific soybean seeding rates using 11 on-farm precision experiments across Nebraska. The second study looked at the protein and oil variability within 22 …

Induced Systemic Resistance Against Nematodes By Plant Growth-Promoting Microbes In Potatoes, Cole Grannan

Master's Theses

Biofertilizers consist of plant growth-promoting microorganisms that establish symbiotic relationships with plant roots and stems. These beneficial microbes play a crucial role in enhancing plant defenses against various threats including insects, nematodes, and microbial pathogens. The purpose of this study was to investigate the effectiveness of two fungal biofertilizers (an endophytic strain of Beauveria bassiana (BA) and a mixture of arbuscular mycorrhizal (AM) fungi), specifically their ability to induce systemic resistance against plant- parasitic nematodes (PPNs) in potatoes (Solanum tuberosum cv. Masquerade) under controlled greenhouse conditions. The study utilized soil collected from Colorado State University’s San Luis Valley (SLV) Research …

Evaluating The Duckweeds Lemna Minor And Spirodela Polyrhiza As Alternative Aquatic Hosts For The Spread Of The Bacterial Wilt Pathogen, Ralstonia Solanacearum, Irelynn Smith

Honors Theses

Ralstonia solanacearum is a plant pathogen that causes bacterial wilt disease in major crops such as tomatoes and potatoes. Recently, this bacterium was discovered in floating pennywort (Hydrocotyle ranunculoides) and Pennsylvania smartweed (Polygonum pennysylvanicum), two previously unsuspected aquatic plants. Duckweed is an aquatic plant with a high level of resilience and short doubling time. Common duckweed (Lemna minor) has previously demonstrated its capability as a versatile high-yield infection model for other types of pathogenic bacteria. Given this newfound branch of aquatic hosts and the fact that duckweed is a common pond weed previously identified in several ponds located nearby infected …

Evaluating The Roles Of Pollinators In Shaping The Floral Color Variation Of Phacelia Dubia, Katherine Riddle

All Theses

Floral color variation within a species is a common occurrence and its maintenance has been a long-standing question in evolutionary biology. Differences in flower color between populations can be shaped by pollinator-mediated selection. Pollinators can exhibit innate and learned preferences for color that may influence floral color variation. These preferences may be molded by the visual environment in which pollinators forage. Most current understanding of how pollinators shape floral color variation involves dramatic differences in dominant pollinators between populations (e.g., hawkmoth vs. bee) and most behavioral work utilized model pollinators like honeybee and bumble bee. However, less is known about …

Elevation And Population Size Effects On The Survival Of Drosera Rotundifolia, Jessica Williams

Electronic Theses and Dissertations

Carnivorous plants face significant conservation challenges due to habitat destruction, climate change, and illegal harvesting. This study explores how elevation and population size influence key-life history traits of D. rotundifolia, such as flowering phenology, prey capture efficiency, seed production, and germination rates. Higher elevations and larger populations are associated with extended flowering durations and increased prey capture. However, seed production and germination rates show complex patterns that are likely influenced by genetic diversity, resource availability, or environmental conditions. These insights inform targeted conservation strategies, emphasizing habitat preservation, enhancing prey availability, and maintaining genetic diversity. Public education and community engagement …

Broad-Spectrum Resistance To Fungal Foliar Diseases In Wheat: Recent Efforts And Achievements, Amira M.I. Mourad, Asmaa A.M. Ahmed, P. Stephen Baenziger, Andreas Börner, Ahmed Sallam

Department of Agronomy and Horticulture: Faculty Publications

Wheat (Triticum spp.) is one of the most important cereal crops in the world. Several diseases affect wheat production and can cause 20-80% yield loss annually. Out of these diseases, stripe rust, also known as yellow rust (Puccinia striiformis f. sp. tritici), stem rust (Puccinia graminis f. sp. tritici), leaf rust (Puccinia recondita), and powdery mildew (Blumeria graminis f. sp. tritici) are the most important fungal diseases that infect the foliar part of the plant. Many efforts were made to improve wheat resistance to these diseases. Due to the continuous advancement in …

Disentangling Genotype And Environment Specific Latent Features For Improved Trait Prediction Using A Compositional Autoencoder, Anirudha Powadi, Talukder Zaki Jubery, Michael C. Tross, James C. Schnable, Baskar Ganapathysubramanian

Department of Agronomy and Horticulture: Faculty Publications

In plant breeding and genetics, predictive models traditionally rely on compact representations of high-dimensional data, often using methods like Principal Component Analysis (PCA) and, more recently, Autoencoders (AE). However, these methods do not separate genotype-specific and environment-specific features, limiting their ability to accurately predict traits influenced by both genetic and environmental factors. We hypothesize that disentangling these representations into genotype-specific and environment-specific components can enhance predictive models. To test this, we developed a compositional autoencoder (CAE) that decomposes high-dimensional data into distinct genotype-specific and environment-specific latent features. Our CAE framework employed a hierarchical architecture within an autoencoder to effectively separate …

Industrial Hemp Biomass Negatively Affected By Herbicide Drift From Corn And Soybean Herbicides, Milos Zaric, Bruno Canella Vieira, Barbara Houston, Guilherme Sousa Alves, Samuel E. Wortman, Julie A. Peterson, Greg R. Kruger

Department of Agronomy and Horticulture: Faculty Publications

The establishment of industrial hemp (Cannabis sativa L.) fields near row crops has raised concerns about the potential adverse effects of herbicide drift on hemp production. This study examined hemp susceptibility to drift of herbicides registered for use in corn and/or soybeans. Herbicide solutions (2,4-D, dicamba, glufosinate, glyphosate, imazethapyr, lactofen, mesotrione) were applied separately in the wind tunnel (3.6 m s⁻¹ airspeed), simulating drift scenarios, with conventional TP95015EVS (TP) and air inclusion AI95015EVS (AI) flat fan nozzles calibrated to deliver 140 L ha⁻¹ carrier volume at 230 kPa. Mylar cards and hemp plants (20–25 cm tall) were placed …

Oregon State Rank Assessment For Pt. Reyes Bird's-Beak (Chloropyron Maritinum Ssp. Palustre), Nora Dunkirk, Gabriel E. Campbell

Institute for Natural Resources Publications

Oregon state conservation status assessment for Pt. Reyes bird's-beak (Chloropyron maritimum ssp. palustre) using NatureServe methodology, 2024.

A Multidirectional Study On Chemical Fingerprints And Biological Activities Of Three Cistus Extracts (C. Creticus, C. Laurifolius, And C. Salviifolius) With Ethnomedicinal Uses, Sakina Yagi, Gökhan Zengi̇n, Selami̇ Selvi̇, Güneş Ak, Zoltán Cziáky, József Jekő, Maria J. Rodrigues, Luisa Custodio, Roberto Venanzoni, Giancarlo Angeles Flores, Gaia Cusumano, Paola Angelini

Turkish Journal of Botany

Humans have used medicinal plants to treat various diseases for thousands of years. Cistus species are also widely used in traditional medicine and have various medicinal applications; therefore, they deserve more in-depth research. The present study evaluated the chemical profile, antioxidant, enzyme inhibition, and cytotoxic properties of the twigs and leaves of C. creticus L., C. laurifolius L., and C. salviifolius L. grown in Türkiye. Methanolic extracts of the three species were rich in phenolics, mainly flavonoids, and exerted potent antioxidant activity with methanolic extract from the leaves of C. salviifolius displayed the highest total phenolic (97.08 mg GAE (gallic …

Responses Of Salvia Nemorosa L. To Silver Nanoparticle And Methyl Jasmonate Stimuli Under Salt Stress, Bi̇lal Andi̇ç, Pinar Orcan

Turkish Journal of Botany

The present study evaluated the effects of methyl jasmonate (MeJA) and silver nanoparticles (AgNP) on Salvia nemorosa L. under NaCl stress. To this end, total soluble sugar, total phenolic and flavonoid contents, total antioxidant capacity, H2O2 content, photosynthetic pigment, MDA, and proline contents, and enzymatic antioxidant activities were assessed. When the results for photosynthetic pigment contents were evaluated, the highest levels of total carotenoid content, chlorophyll a, and chlorophyll b were obtained with NaCl + AgNP + MeJA treatment. Under NaCl stress, MDA and H2O2 levels increased, but they decreased when AgNP and MeJA were applied. All treatment groups had …

Morpho-Environmental Variability For Scilla L. The Biogeographic Dynamism Under Climate Change Scenarios, João Rocha, Rubén Ramírez-Rodríguez, Francisco Amich, Darinka Gonzalez, Mário Santos, Reinaldo Cajaiba, António L. Crespí

Turkish Journal of Botany

This paper explores the correlations between morphological variability and range dynamics in western Eurasian-Mediterranean flora through a fluctuating asymmetry (FA) perspective across ten climate scenarios. We investigate the potential distribution of Scilla L. and its thermopluviometric correlations, and compare them with other three genera analysed previously, for western Eurasia and northern Africa (Baldellia Parl., Jasione L., and Ononis L. -Viscosae and Natrix sections-), considering past (22 Kyrs), present, and future conditions (2081-2100). By comparing "overlapped areas" (OA) with "non-overlapped areas" (NOA), we found two distinct groups of responses among genera: Scilla show higher morphological variability in NOAs, while Baldellia concentrate …

Implementation Of A New Non-Destructive Phytobenthic Index (Npi) With The Posidonia Biotic Index (Bipo) To Evaluate The Ecological Status Of The Turkish Aegean Coasts (Eastern Mediterranean), Ergün Taşkin, Aysu Güreşen, Furkan Bi̇lgi̇ç

Turkish Journal of Botany

Within this study, the ecosystem status of the Aegean Sea coasts of Türkiye (Eastern Mediterranean) was assessed using the Posidonia Biotic Index (BiPo) and a newly proposed Non-destructive Phytobenthic Index (NPI) according to the requirements of the Water Framework Directive (WFD 2000/60/EC). In addition, their relations with Land Uses Simplified Index for shallow water macroalgae (MA₋LUSI) were evaluated. The descriptors measured through NPI were: shoot density, cover, depth and type of lower limit of Posidonia meadows and cover of other macrophytic communities; Cymodocea/Zostera, canopy forming brown, coralligenous, opportunistic and alien macroalgae. The “good” status is presented by mean value of …

A New Species Of Polygonum Sect. Polygonum (Polygonaceae) From Southwest Of Türkiye, Kami̇l Coşkunçelebi̇, Suzan Kundakçi, Mutlu Gültepe, Serdar Makbul

Turkish Journal of Botany

Polygonum uysalii (Polygonaceae), a new species from the transition zone between Mediterranean and Irano-Turanian floristic region of Türkiye is described based on morphological and molecular evidence. The new species is similar to P. ekimianum and P. salebrosum endemic to Türkiye, but it clearly differs by its ovate-broadly elliptic leaf (not linear–lanceolate to narrowly elliptic- suborbicular), 0.9 ̶ 1.6 mm length pedicel (not 2.1 ̶ 4.88 mm), dark brown ochrea at base (not pale brown) and trigonous fruit (not weakly trigonous only in upper part or ovate-elliptic). Diagnostic characters and phylogeny of the new species are discussed with respect to taxonomy …

Determining The Long-Term Effectiveness Of Seeding Post-Dam Removal In The Elwha River, Wa, Through Soil Seed Bank Analysis, Makenna Tabino, Rebecca Brown

2024 Symposium

Following the historic dam removal along the Elwha River in Olympic National Park, we are evaluating the impact of seeding in the former Lake Mills reservoir by examining the soil seed bank composition. The Elwha River had the largest dam removal project in history, and the second largest ecological restoration project in National Parks Service history. Active restoration (seeding and planting) took place in terraces and valley walls, the two dominant landform types found in the former reservoir. While the plant community in the former dam reservoirs is well documented, the soil seed bank remains unexplored.

My objective is to …

Designing A Decision-Support Tool For Fertilizer Recommendations In Oil Palm Smallholders, Rana Farrasati

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Oil palm (Elaeis guineensis Jacq.), originally from West Africa, now accounts for 42% of global vegetable oil production and mainly includes key regions cultivated in tropical regions of Southeast Asia, West Africa, South America, and Central America. Despite its economic significance, the oil palm industry faces challenges of stagnant yields and large yield gaps, particularly among independent smallholders. These issues often stem from inadequate nutrient management practices and limited agronomic knowledge. Our objective was to quantify nutrient requirements for mature oil palm plantations as a basis to design a decision support tool (DST) for fertilizer recommendations. To do so, …