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Plant Biology

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2012

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Articles 151 - 156 of 156

Full-Text Articles in Life Sciences

Evaluation Of Heat Shock Protein 70a (Hsp70a) In Chlamydomonas Reinhardtii, Sarah Nicole Short Jan 2012

Evaluation Of Heat Shock Protein 70a (Hsp70a) In Chlamydomonas Reinhardtii, Sarah Nicole Short

Theses and Dissertations--Biosystems and Agricultural Engineering

Algae are being considered as a possible tool for carbon dioxide mitigation because they uptake carbon dioxide during photosynthesis. Using flue gas from a coal-fired power plant as a carbon source would allow the algae to remove CO2 from the flue gas before it is emitted into the atmosphere. Because algae do not grow well at the high temperature, low pH conditions presented by flue gas, the traditional approach has been to alter the flue gas to suit the needs of the algae; however, this work aimed to genetically modify the algae Chlamydomonas reinhardtii to grow better at less …


Effects Of Light Limitation On Plant-­Rhizobia And Plant-Mycorrhiza Interactions, Jess A. Millar Jan 2012

Effects Of Light Limitation On Plant-­Rhizobia And Plant-Mycorrhiza Interactions, Jess A. Millar

Anthós

Plants respond with a sink stimulation of photosynthesis when colonized by bacterial and fungal mutualists, which compensates for costs of carbohydrate allocation to the microbes. Problems may arise when light is limited and plants cannot increase photosynthesis. We hypothesize that under such conditions the costs for maintaining the mutualism outweigh the benefits, which ultimately turns the beneficial microbes into parasites exploiting resources and reducing host fitness. We study these plant-­‐microbe interactions under different light availabilities using lima bean plants, rhizobia (nitrogen-­‐fixing bacteria), and mycorrhizal fungi. In our study, we apply two levels of light (full light and light intensity reduced …


Edaphic Adaptation Maintains The Coexistence Of Two Cryptic Species On Serpentine Soil, J M. Yost, T Barry, K M. Kay, N Rajakaruna Jan 2012

Edaphic Adaptation Maintains The Coexistence Of Two Cryptic Species On Serpentine Soil, J M. Yost, T Barry, K M. Kay, N Rajakaruna

Nishanta Rajakaruna

• Premise of the study: Divergent edaphic adaptation can contribute to reproductive isolation and coexistence between closely related species, yet we know little about how small-scale continuous edaphic gradients contribute to this phenomenon. We investigated edaphic adaptation between two cryptic species of California wildflower, Lasthenia californica and L. gracilis (Asteraceae), which grow in close parapatry on serpentine soil. • Methods: We reciprocally transplanted both species into the center of each species’ habitat and the transition zone between species. We quantified multiple components of fitness and used aster models to predict fitness based on environmental variables. We sampled soil across the …


Investigation Of The Importance Of Rock Chemistry For Saxicolous Lichen Communities Of The New Idria Serpentinite Mass, San Benito County, California, Usa, N Rajakaruna, K Knudsen, A Fryday, R E. O’Del, N Pope, F C. Olday, S Woolhouse Jan 2012

Investigation Of The Importance Of Rock Chemistry For Saxicolous Lichen Communities Of The New Idria Serpentinite Mass, San Benito County, California, Usa, N Rajakaruna, K Knudsen, A Fryday, R E. O’Del, N Pope, F C. Olday, S Woolhouse

Nishanta Rajakaruna

Although several lichen inventories exist for European ultramafic sites, only four surveys of serpentine lichens for North America have been published to date. Of those, only one has been conducted in California. We conducted a survey of saxicolous lichens from ultramafic rocks (including nephrite, partially serpentinized peridotite, and serpentinite) and non-ultramafic rocks (including silica-carbonate, shale, and sandstone) at the New Idria serpentinite mass, San Benito County, California. X-ray Fluorescence Analysis of the rocks from which the lichens were collected revealed significant elemental differences between the ultramafic and non-ultramafic rocks for 26 of the 32 major and trace elements analyzed. We …


Systematics, Biogeography And Leaf Anatomy And Architecture Of Bursera Subgen. Bursera (Burseraceae) In The Greater Antilles And The Bahamas, María Cristina Martínez-Habibe Jan 2012

Systematics, Biogeography And Leaf Anatomy And Architecture Of Bursera Subgen. Bursera (Burseraceae) In The Greater Antilles And The Bahamas, María Cristina Martínez-Habibe

CGU Theses & Dissertations

This dissertation presents a comprehensive study on the origin and evolutionary relationships of the species of Bursera in Cuba, Hispaniola, Jamaica and the Bahamas. The goals of the first chapter were to test monophyly of the group, revisit a recent transfer of two species of Bursera to Commiphora, and place recently discovered mainland species using the reconstructed phylogenies. Additionally, divergence estimations using fossils were used as independent tests of several hypotheses regarding the arrival of the modern biota to the Greater Antilles and Bahamas (GAB). I conclude that all endemic taxonomic entities of the genus in this region belong …


Biodiversity Status In Ethiopia And Challenges, Azamal Husen, V.K. Mishra, Kamal Semwal, Dinesh Kumar Dec 2011

Biodiversity Status In Ethiopia And Challenges, Azamal Husen, V.K. Mishra, Kamal Semwal, Dinesh Kumar

Prof. Azamal Husen

Ethiopia is rich in faunal, floral and microbial diversity. Conservation paradigms, practices and policies have been variably successful. Traditional approaches in conservation have evolved awareness about biodiversity conservation. Climate change poses unknown fear and challenge to biodiversity conservation in the 21st century. There is urgent need of mapping of biodiversity in various environments, inventorization, monitoring of biodiversity, and global data sharing. Conservation of genetic resources will assist in future genetic improvement of crop plants and livestocks. Bioprospecting-value addition to biodiversity will provide economic gain for the country. Necessary measures need to be initiated to safeguard the germplasms against potential threat …