Journal of Food, Agriculture and Environment

Comparative study on drought tolerance of wheat and wheat-Aegilops biuncialis 6U^b addition lines

Author(s):

Hui Zhao ^{1, 3, 4}, Wei Zhang ^{1, 2}, Jing Wang ¹, Furong Li ¹, Fa Cui ^{1, 2}, Jun Ji ^{1, 2}, Daowen Wang ², Junming Li ^{1, 2}*

Recieved Date: 2013-07-09, Accepted Date: 2013-09-24

Abstract:

Alien chromatin has been exploited in wheat genetic improvement for increased drought tolerance. Aegilops species have a variety of germplasm resources about abiotic stress tolerance. Some new germplasms have been bred from crossing between Aegilops biuncialis and Chinese Spring (CS). The information about a series of physiological responses on wheat-Ae. biuncialis lines to drought stress is important for precise evaluation of their drought tolerance and developing new tolerant lines. In the present study, two promising wheat-Ae. biuncialis 6U^b addition lines Ae9041 and Ae9061 and two strong drought-tolerant wheat varieties Shi 4185 (S4185) and Jinmai 47 (JM47) were used to specify the response of physiological and agronomic characteristics to drought stress. Germination test with different levels (0%, 15%, 20%, 25% and 30%) (w/v) with polyethylene glycol (PEG)-6000 simulated drought stress showed that the wheat-Ae. biuncialis 6U^b addition lines exhibited strong growth of coleoptile, radicle, shoot and higher seed reserve transfer rate under severe drought stress. In rainfed field trial, the wheat-Ae. biuncialis 6U^b addition lines maintained higher relative water content (RWC) than control wheat genotypes and showed positive agronomic performance in terms of spike length, spikelet number per spike, kernel number per spike, and grain yield except tall plant height. It was notable that Ae9061 manifested the lowest rate of excised-leaf water loss, the highest RWC and maximum grain yield under drought stress. These results indicated that the wheat-Ae. biuncialis 6U^b addition lines had stronger drought tolerance, which are of great potential to be used in wheat breeding programs designed to improve drought tolerance.

Keywords:

Wheat (Triticum aestivum L.), Aegilops biuncialis, addition line, drought tolerance, germination, rate of excised-leaf water loss, relative water content, yield-related trait, stress tolerance index

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Agriculture
Pages: 1046-1052

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