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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Physiological performance and differential expression profiling of genes associated with drought tolerance in root tissue of four contrasting varieties of two Gossypium species
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Physiological performance and differential expression profiling of genes associated with drought tolerance in root tissue of four contrasting varieties of two Gossypium species

机译：两种棉的四个对立变种根系耐旱相关基因的生理性能和差异表达谱

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摘要

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 (a dagger C-13) in the root tissues showed maximum depletion in the a dagger C-13 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.
机译：干燥土壤中的根系生长通常受机械阻抗和水分胁迫的限制。由于根部组织的主要功能是吸收水分和养分，因此它在植物生长和胁迫管理中起着重要作用。以前，我们研究了四个棉花品种叶片组织中与耐旱性相关的基因的生理性能和表达谱。在这里，我们进一步研究了这些品种的根组织。陆地棉属种JKC-770具有耐旱性，而KC-2具有干旱敏感性，而棉草属种JKC-717具有耐旱性，而RAHS-187具有干旱敏感性。 JKC-770和JKC-717耐旱品种显示出相对较高的谷胱甘肽-S-转移酶，超氧化物歧化酶，脯氨酸及其基因表达，而丙二醛含量低，表明在干旱条件下膜损伤小且抗氧化防御能力更好。纤维素合酶，木葡聚糖：木糖葡糖基转移酶和糖基水解酶的表达水平表明，细胞壁结构的调节和糖向渗透保护剂的分配，而不是耐性品种中细胞壁的生物合成。热休克蛋白和丝氨酸/苏氨酸蛋白磷酸酶在干旱条件下显示出上调，分别负责温度耐受性和蛋白磷酸化。这些影响许多代谢过程，并且可能在JKC-770的耐旱性和耐旱性中起关键作用。根据根部组织中碳同位素歧视（匕首C-13）估算的长期水分利用效率（WUE）在JKC-770品种中的匕首C-13值显示最大损耗，而在RAHS-参照其各自的对照，在干旱胁迫下的187，表明JKC-770品种的WUE较高。

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