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《Chinese Journal of Tropical Crops》 2016-03
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Physiological Characteristics of Drought-tolerance of a New Cassava Variety Xinxuan 048

LUO Xinglu;WEI Wanling;SHAN Zhongying;FAN Wujing;Agricultural College, Guangxi University;State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources;  
The physiological ch aracteristics of drought-tolerance of a new cassava variety Xinxuan 048 were studied under drought stress in this experiment. The results showed that different water treatments significantly affected cassava plant height, stem diameter, leaf free water / bound water, proline content, soluble protein content, soluble sugar content, MDA content, the activity of protective enzymes, chlorophyll content and cell membrane permeability. With the extension of enhanced water stress and stress time, cassava leaf proline content,MDA content, soluble protein content, relative electrolyte leakage rate, SOD activity, CAT activity were on the rise, while POD activity decreased first after rising, falling after the soluble sugar content increased first. With the deepening of the degree of water stress, cassava plant height, stem diameter, leaf chlorophyll content and free water / bound water falling; and with the increase of water stress time, free water / bound water ratio was declining, and the chlorophyll content was rising at the first and then falling, but the magnitudes of change were relatively slow. Thus, under drought stress, the proline content, MDA content, soluble protein content, relative electrolyte leakage rate, SOD activity and CAT activity increased and the free water / bound water content ratio decreased, which were used as the main physiological indexes of drought-tolerance assessment of cassava.
【Fund】: 广科技攻关项目——木薯节水高效智能化微滴灌溉系统研究与示范(桂科攻1222014);广科技攻关项目——高产高粉、适于机械化生产木薯新品种选育与示范(桂科重14121005-2-1);; 广西水利厅科技项目——木薯高效节水灌溉技术研究与示范(No.201413);; 南宁市科技攻关项目——木薯需水特性与节水灌溉技术研究与示范(No.20132307);; 高产优质木薯新品种选育及配套高产高效栽培技术示范推广(No.201109044B)
【CateGory Index】: S533
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