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- W2016603612 abstract "Major objective of this study is to elucidate the effect of early activation of root hair cell plasma membrane (PM) H+-ATPase on drought adaptation in plants. Pot-culture experiments were carried out to determine oat (Avena sativa L.) genotypic differences in water maintenance, osmotic adjustment and PM H+-ATPase activity at the seedling stage. Two oat genotypes with contrasting drought sensitivity, Dingyou6 (A. vernasativa, drought-tolerant cultivar) and Bende (A. venanuda, drought-sensitive cultivar) were subjected to soil drought stress under environment-controlled growth chamber conditions. At 21 days after emergence, water supply was withheld to allow soils in pots to dry. Our results showed that drought-tolerant “Dingyou6” maintained significantly greater RWC and osmotic potential (OP) in roots and leaves, and also had larger root-to-leaf ratios of RWC and OP than drought-sensitive “Bende” along with 14-day drying process, suggesting that drought-tolerant cv. possesses superior root-to-leaf hydraulic conductivity, and stronger regulatory ability to drought stress. Analysis of the PM H+-ATPase activity and the root and leaf osmolyte contents provided further chemical evidence for this result. Biosynthesis of leaf proline and glycine betaine (GB) followed a similar trend as the activities of root hair cell PM H+-ATPase prior to intermediate stress (around 35% FWC). Significant increase in the activity of PM H+-ATPase was observed at the SWC of about 45–50% FWC, without detectable changes in leaf and root RWC simultaneously. This demonstrated that there existed an early-warning response in roots before the onset of significant decrease in plant RWC. Moreover, the interspecific difference in the timing of triggering early response was obvious. Drought-tolerant “Dingyou6” initiated early response at about 50% FWC, but at about 45% FWC for drought-sensitive cv. This study implies that early activation of root hair cell PM H+-ATPase triggers the increased biosynthesis of major osmolytes, which, in turn, leads to the up-regulation of water maintenance system." @default.
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- W2016603612 date "2010-09-01" @default.
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- W2016603612 title "Early activation of plasma membrane H+-ATPase and its relation to drought adaptation in two contrasting oat (Avena sativa L.) genotypes" @default.
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- W2016603612 doi "https://doi.org/10.1016/j.envexpbot.2010.02.011" @default.
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