应用生态学报2012，Vol.23Issue(3)：724-730,7.
干旱胁迫对小麦幼苗根系生长和叶片光合作用的影响
Responses of wheat seedlings root growth and leaf photosynthesis to drought stress
摘要
Abstract
Taking drought-sensitive wheat cultivar Wangshuibai and drought-tolerance cultivar Luo-han 7 as test materials, a hydroponic experiment was conducted to study the effects of drought stress on root system morphology, physiological characteristics and leaf photosynthesis of wheat seedlings, aimed to elucidate the adaptation mechanisms to drought stress. Under drought stress, the root vitality of the cultivars increased markedly, but the root number and root surface area decreased. Drought stress decreased relative water content and increased the ratio of bound water to free water in leaves of Wangshuibai, but had less effects on Luohan 7. Drought stress decreased, the leaf chlorophyll content, Pn, gs, Ci, and transpiration rate of the two cultivars, but had no significant effects on leaf chlorophyll content and Pn of Luohan 7. Drought stress decreased the leaf area of the two cultivars and the root biomass, shoot biomass, and plant biomass of Wangshuibai, but had no significant effects on Luohan 7. The results indicated that under drought stress, drought-tolerant wheat cultivar was able to compensate decreased root absorption area and retain higher root water uptake capability via enhancing root vitality and maintaining higher root biomass, and further, to keep higher leaf photosynthetic area and Pn to mitigate the inhibition of drought on wheat seedlings growth.关键词
小麦/干旱胁迫/耐旱性/光合作用/根系Key words
wheat/ drought stress/ drought tolerance/ photosynthesis/ root system分类
农业科技引用本文复制引用
马富举,李丹丹,蔡剑,姜东,曹卫星,戴廷波..干旱胁迫对小麦幼苗根系生长和叶片光合作用的影响[J].应用生态学报,2012,23(3):724-730,7.基金项目
国家自然科学基金项目(30871481)和江苏省科技支撑计划项目(BE2009426)资助. （30871481）
