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首页> 美国卫生研究院文献>Plant Signaling Behavior >Creating drought- and salt-tolerant cotton by overexpressing a vacuolar pyrophosphatase gene
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Creating drought- and salt-tolerant cotton by overexpressing a vacuolar pyrophosphatase gene

机译：通过过表达液泡焦磷酸酶基因来创造耐旱和耐盐的棉花

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摘要

Increased expression of an Arabidopsis vacuolar pyrophosphatase gene, AVP1, leads to increased drought and salt tolerance in transgenic plants, which has been demonstrated in laboratory and field conditions. The molecular mechanism of AVP1-mediated drought resistance is likely due to increased proton pump activity of the vacuolar pyrophosphatase, which generates a higher proton electrochemical gradient across the vacuolar membrane, leading to lower water potential in the plant vacuole and higher secondary transporter activities that prevent ion accumulation to toxic levels in the cytoplasm. Additionally, overexpression of AVP1 appears to stimulate auxin polar transport, which in turn stimulates root development. The larger root system allows AVP1-overexpressing plants to absorb water more efficiently under drought and saline conditions, resulting in stress tolerance and increased yields. Multi-year field-trial data indicate that overexpression of AVP1 in cotton leads to at least 20% more fiber yield than wild-type control plants in dry-land conditions, which highlights the potential use of AVP1 in improving drought tolerance in crops in arid and semiarid areas of the world.
机译：拟南芥液泡焦磷酸酶基因AVP1的表达增加导致转基因植物对干旱和盐的耐受性增强，这已在实验室和田间条件下得到证实。 AVP1介导的抗旱性的分子机制可能是由于液泡焦磷酸酶的质子泵活性增加，其在液泡膜上产生较高的质子电化学梯度，从而导致植物液泡中的水势较低，而二级转运蛋白活性较高，从而阻止了离子积累到细胞质中的毒性水平。此外，AVP1的过表达似乎刺激了生长素的极性转运，进而刺激了根的发育。较大的根系使过表达AVP1的植物在干旱和盐碱条件下能更有效地吸收水分，从而提高了胁迫耐受性并提高了产量。多年的田间试验数据表明，在干旱地区，棉花中AVP1的过量表达比野生型对照植物的纤维产量高至少20％，这突显了AVP1在改善干旱地区作物抗旱性方面的潜在用途和世界半干旱地区。

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