title: Physiological performance and differential expression profiling of genes associated with drought tolerance in root tissue of four contrasting varieties of two Gossypium species.
abstract: Root growth in drying soil is generally limited by a combination of mechanical impedance and water stress. As the major function of root tissue is water and nutrient uptake, so it imparts an important role in plant growth and stress management. Previously, we have studied physiological performance and expression profiling of gene associated with drought tolerance in leaf tissue of four cotton varieties. Here, we have further continued our studies with the root tissue of these varieties. The Gossypium hirsutum species JKC-770 is drought-tolerant and KC-2 is drought-sensitive, while Gossypium herbaceum species JKC-717 is drought-tolerant and RAHS-187 is drought-sensitive. JKC-770 and JKC-717 the drought-tolerant varieties showed a comparatively high glutathione-S-transferase, superoxide dismutase, proline along with their gene expression, and low malondialdehyde content indicating low membrane damage and better antioxidative defense under drought condition. The expression levels of cellulose synthase, xyloglucan:xyloglucosyl transferase, and glycosyl hydrolases suggest modulation in cell wall structure and partitioning of sugars towards osmoprotectants instead of cell wall biosynthesis in tolerant varieties. Heat shock proteins and serine/threonine protein phosphotases show upregulation under drought condition, which are responsible for temperature tolerance and protein phosphorylation, respectively. These effects many metabolic processes and may be playing a key role in drought tolerance and adaptability of JKC-770 towards drought tolerance. The long-term water use efficiency (WUE) estimated in terms of carbon isotope discrimination (∆(13)C) in the root tissues showed maximum depletion in the ∆(13)C values in JKC-770 variety, while minimum in RAHS-187 under drought stress with reference to their respective control, suggesting a high WUE in JKC-770 variety.
authors: Plant Physiology Division, CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India.
authors: Ruchi
authors: R
authors: Singh
authors: Plant Molecular Biology and Genetic Engineering Division, CSIR-National Botanical Research Institute, Lucknow, 226001, India.
authors: Neha
authors: N
authors: Pandey
authors: Plant Physiology Division, CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India.
authors: Anil
authors: A
authors: Kumar
authors: Plant Physiology Division, CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India. pashirke@nbri.res.in.
authors: Pramod A
authors: PA
authors: Shirke
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D018533:Biomass; D002244:Carbon / Q000378:metabolism; D002247:Carbon Isotopes; D055864:Droughts; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant; D003368:Gossypium / Q000187:drug effects / Q000235:genetics* / Q000502:physiology*; D015227:Lipid Peroxidation / Q000187:drug effects; D008353:Mannitol / Q000494:pharmacology; D055442:Metabolome / Q000187:drug effects / Q000235:genetics; D009584:Nitrogen / Q000378:metabolism; D009995:Osmosis / Q000187:drug effects; D018517:Plant Roots / Q000201:enzymology / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D018520:Plant Shoots / Q000187:drug effects / Q000254:growth & development; D025341:Principal Component Analysis; D011392:Proline / Q000378:metabolism; D013261:Sterols / Q000378:metabolism; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics; D013482:Superoxide Dismutase / Q000378:metabolism; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D013261:Sterols; D008353:Mannitol; D005680:gamma-Aminobutyric Acid; D002244:Carbon; D011392:Proline; D013482:Superoxide Dismutase; D009584:Nitrogen
keywords: Carbon isotope discrimination; Cotton; Drought; Gene expression; Metabolites; Water use efficiency