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Identification of Leaf Based Physiological Markers for Drought Susceptibility during Early Seedling Development of Mungbean

机译:绿豆幼苗早期干旱过程中叶片生理指标的鉴定

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Drought is a recurrent phenomenon in many of the countries. Moisture stress during seedling stage is very critical in determining the establishment of the crop and its further development and yield. Identifying drought tolerance mechanism and physiological markers of drought susceptibility is this crop during seedling stress would be useful tool in future genetic manipulation programme to establish drought tolerance in this crop. Thus the present study aimed for quickly identifying reliable physiological markers for drought susceptibility through evaluation of physiological and biochemical changes in leaves of two contrasting mungbean (Vigna radiata L. Wilczek) cultivars i.e. K 851 (drought tolerant) and PDM 84-139 (drought susceptible) during seedling development. A range of four external water potentials (i.e. -1.0, -2.0, -3.0 and -4.0 bars), besides glass distilled water as control (0.0 bar), was used. Parameters like leaf area, relative leaf water content, chlorophyll content, chlorophyll stability indices in both the cultivars were decreased with the increasing magnitude of stress. By and large phenols and ascorbic acid content were increased with the stress level but the trend was not consistent. A steady rise in proline, hydrogen peroxide content and lipid peroxidation was found with water stress. Out of two cultivars tested, drought tolerant cultivar K 851 was better in leaf water balance and higher accumulation of phenols, proline and ascorbic acid than PDM 84-139. The correlation study indicated lipid peroxidation and H2O2 content as valuable physiological markers for screening of drought susceptibility.
机译:在许多国家,干旱是经常发生的现象。幼苗期的水分胁迫对于决定作物的长势以及进一步的发展和产量至关重要。识别干旱耐受机制和干旱敏感性的生理标记是该作物在幼苗胁迫期间将是将来的遗传操纵程序中建立该作物抗旱性的有用工具。因此,本研究旨在通过评估两个对比绿豆(Vigna radiata L. Wilczek)品种K 851(耐旱)和PDM 84-139(易受干旱影响)的叶片的生理生化变化,来快速鉴定可靠的干旱敏感性生理指标。 )在幼苗发育过程中。除了玻璃蒸馏水作为对照(0.0巴)外,还使用了一系列四种外部水势(即-1.0,-2.0,-3.0和-4.0巴)。随着胁迫程度的增加,两个品种的叶片面积,相对叶片含水量,叶绿素含量,叶绿素稳定性指标等参数均降低。总体上,酚和抗坏血酸的含量随胁迫水平的增加而增加,但趋势却不一致。发现在水分胁迫下脯氨酸,过氧化氢含量和脂质过氧化作用持续增加。在测试的两个品种中,耐旱品种K 851与PDM 84-139相比,叶片水分平衡更好,酚,脯氨酸和抗坏血酸的积累更高。相关性研究表明脂质过氧化和过氧化氢含量是筛选干旱敏感性的有价值的生理指标。

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