南方农业学报2012，Vol.43Issue(10)：1461-1465,5.DOI:10.3969/j.issn.2095-1191.2012.10.1461
两个木薯品种需水特性研究
Water-requirement characteristics of two cassava varieties
摘要
Abstract
This experiment was conducted to discuss the water-requirement characteristics of cassava varieties SC 205 and Xinxuan 048 and to provide scientific basis for cassava cultivation and drought resistance breeding. [Method]Cassava varieties SC 205 (main variety grown in Guangxi) and Xinxuan 048 (bred by Guangxi University) were taken as test materials; four treatments, viz., (A) normal water supply (CK) , (B) mild drought, (C) moderate drought, and (D) severe drought, were set. The net photosynthetic rate, leaf water potential, leaf membrane permeability, chlorophyll a+b, MDA , PRO , and biomass were measured during the cassava root tube formation period (from May to July) and expanding period (from July to September), and maturity (Sep. to Dec). [ Result ]The water-stress time of SC 205 was earlier than that of Xinxuan 048. The influence of water-stress on cassava was more obvious in the late growth period. The photosynthesis efficiency of cassava leaves was affected by water stress under drought condition. However, the compensation effect of water stress on the photosynthesis efficiency was likely to appear under the mild and moderate drought conditions. [Conclusion]The order of cassava physiology responses to drought stress was as follows: photosynthetic rate> transpiration>stomatal conductance>leaf water potential. The appropriate water stress was beneficial to cassava yield formation and starch accumulation. Cassava variety Xinxuan 048 showed stronger drought resistance than that of SC 205 under this experimental condition.关键词
木薯/水分胁迫/生理生化指标Key words
cassava/ water stress/ physiological and biochemical indexes分类
农业科技引用本文复制引用
王泽平,刘海斌,罗兴录..两个木薯品种需水特性研究[J].南方农业学报,2012,43(10):1461-1465,5.基金项目
国家农业科技成果转化资金项目(2008GB2E100248) （2008GB2E100248）
国家科技支撑计划项目(2007BAD75B02) （2007BAD75B02）
广西自然科学基金项目(桂自基0542023,桂科基0236006) （桂自基0542023,桂科基0236006）
广西科技攻关项目(桂科攻0782003-A1) （桂科攻0782003-A1）
