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Full-Text Articles in Life Sciences
Comparative Proteomics Of Root Apex And Root Elongation Zones Provides Insights Into Molecular Mechanisms For Drought Stress And Recovery Adjustment In Switchgrass, Zhujia Ye, Sasikiran Reddy Sangireddy, Chih-Li Yu, Dafeng Hui, Kevin Howe, Tara Fish, Theodore W. Thannhauser, Suping Zhou
Comparative Proteomics Of Root Apex And Root Elongation Zones Provides Insights Into Molecular Mechanisms For Drought Stress And Recovery Adjustment In Switchgrass, Zhujia Ye, Sasikiran Reddy Sangireddy, Chih-Li Yu, Dafeng Hui, Kevin Howe, Tara Fish, Theodore W. Thannhauser, Suping Zhou
Agricultural and Environmental Sciences Faculty Research
Switchgrass plants were grown in a Sandwich tube system to induce gradual drought stress by withholding watering. After 29 days, the leaf photosynthetic rate decreased significantly, compared to the control plants which were watered regularly. The drought-treated plants recovered to the same leaf water content after three days of re-watering. The root tip (1cm basal fragment, designated as RT1 hereafter) and the elongation/maturation zone (the next upper 1 cm tissue, designated as RT2 hereafter) tissues were collected at the 29th day of drought stress treatment, (named SDT for severe drought treated), after one (D1W) and three days (D3W) of re-watering. …
Genotyping By Sequencing And Genome–Environment Associations In Wild Common Bean Predict Widespread Divergent Adaptation To Drought, Andrés J. Cortés, Matthew W. Blair
Genotyping By Sequencing And Genome–Environment Associations In Wild Common Bean Predict Widespread Divergent Adaptation To Drought, Andrés J. Cortés, Matthew W. Blair
Agricultural and Environmental Sciences Faculty Research
Drought will reduce global crop production by >10% in 2050 substantially worsening global malnutrition. Breeding for resistance to drought will require accessing crop genetic diversity found in the wild accessions from the driest high stress ecosystems. Genome–environment associations (GEA) in crop wild relatives reveal natural adaptation, and therefore can be used to identify adaptive variation. We explored this approach in the food crop Phaseolus vulgaris L., characterizing 86 geo-referenced wild accessions using genotyping by sequencing (GBS) to discover single nucleotide polymorphisms (SNPs). The wild beans represented Mesoamerica, Guatemala, Colombia, Ecuador/Northern Peru and Andean groupings. We found high polymorphism with a …
Effects Of Precipitation Changes On Switchgrass Photosynthesis, Growth, And Biomass: A Mesocosm Experiment, Dafeng Hui, Chih-Li Yu, Qi Deng, E. Kudjo Dzantor, Suping Zhou, Sam Dennis, Roger Sauve, Terrance L. Johnson, Philip A. Fay, Weijun Shen, Yiqi Luo
Effects Of Precipitation Changes On Switchgrass Photosynthesis, Growth, And Biomass: A Mesocosm Experiment, Dafeng Hui, Chih-Li Yu, Qi Deng, E. Kudjo Dzantor, Suping Zhou, Sam Dennis, Roger Sauve, Terrance L. Johnson, Philip A. Fay, Weijun Shen, Yiqi Luo
Agricultural and Environmental Sciences Faculty Research
Climate changes, including chronic changes in precipitation amounts, will influence plant physiology and growth. However, such precipitation effects on switchgrass, a major bioenergy crop, have not been well investigated. We conducted a two-year precipitation simulation experiment using large pots (95 L) in an environmentally controlled greenhouse in Nashville, TN. Five precipitation treatments (ambient precipitation, and -50%, -33%, +33%, and +50% of ambient) were applied in a randomized complete block design with lowland "Alamo" switchgrass plants one year after they were established from tillers. The growing season progression of leaf physiology, tiller number, height, and aboveground biomass were determined each growing …
Evaluation Of Common Bean (Phaseolus Vulgaris L.) Genotypes For Drought Stress Adaptation In Ethiopia, Kwabena Darkwa, Daniel Ambachew, Hussein Mohammed, Asrat Asfaw, Matthew W. Blair
Evaluation Of Common Bean (Phaseolus Vulgaris L.) Genotypes For Drought Stress Adaptation In Ethiopia, Kwabena Darkwa, Daniel Ambachew, Hussein Mohammed, Asrat Asfaw, Matthew W. Blair
Agricultural and Environmental Sciences Faculty Research
Drought stress linked with climate change is one of the major constraints faced by common bean farmers in Africa and elsewhere. Mitigating this constraint requires the selection of resilient varieties that withstand drought threats to common bean production. This study assessed the drought response of 64 small red-seeded genotypes of common bean grown in a lattice design replicated twice under contrasting moisture regimes, terminal drought stress and non-stress, in Ethiopia during the dry season from November 2014 to March 2015. Multiple plant traits associated with drought were assessed for their contribution to drought adaptation of the genotypes. Drought stress determined …
Phenotyping Common Beans For Adaptation To Drought, Stephen E. Beebe, Idupulapati M. Rao, Matthew W. Blair, Jorge A. Acosta-Gallegos
Phenotyping Common Beans For Adaptation To Drought, Stephen E. Beebe, Idupulapati M. Rao, Matthew W. Blair, Jorge A. Acosta-Gallegos
Agricultural and Environmental Sciences Faculty Research
Common beans (Phaseolus vulgaris L.) originated in the New World and are the grain legume of greatest production for direct human consumption. Common bean production is subject to frequent droughts in highland Mexico, in the Pacific coast of Central America, in northeast Brazil, and in eastern and southern Africa from Ethiopia to South Africa. This article reviews efforts to improve common bean for drought tolerance, referring to genetic diversity for drought response, the physiology of drought tolerance mechanisms, and breeding strategies. Different races of common bean respond differently to drought, with race Durango of highland Mexico being a major …