Journal of Food, Agriculture and Environment

Enhanced aquaporin activity of two different genotypes of drought-resistant wheat (Triticum aestivum L.) cultivars facilitate their adaptation to drought stress

Author(s):

Hongbin Zhao ^{1, 2}, Zhengbin Zhang ^1*, Ping Xu ¹

Recieved Date: 2010-02-02, Accepted Date: 2010-04-09

Abstract:

Inhibitory effects of mercury chloride (HgCl₂, 25 µM, 50 µM and 100 µM) on the activity of aquaporins (AQPs) were investigated by comparing two wheat (Triticum aestivum L.) cultivars with different drought resistance. Leaf photosynthetic rate (Pn), transpiration rate (Tr) and leaf water use efficiency (WUE_L= Pn/Tr) were measured. Our results showed that Hg toxicity repressed Pn, Tr and WUE_L in both ‘Shi4185’ (S4) and ‘Jinmai 47’ (JM). However, the regulation model of Pn, Tr and WUE_L was different between the two cultivars. Drought tolerance cultivar ‘JM’ showed a higher Hg toxicity tolerance than the irrigated land cultivar ‘S4’. Our results suggested that different Hg tolerance in the two cultivars is related to the different activity AQP. Our study provides insight into the complicated mechanism of drought resistance and water-saving in wheat.

Keywords:

Aquaporin (AQP), wheat, mercury chloride (HgCl₂), water use efficiency (WUE)

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Environment
Pages: 1158-1161

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