作物学报2011，Vol.37Issue(3)：521-528,8.DOI:10.3724/SP.J.1006.2011.00521
干旱胁迫对玉米苗期植株生长和光合特性的影响
Influence of Drought Stress on Plant Growth and Photosynthetic Traits in Maize Seedlings
摘要
Abstract
The responses of plant growth, gas exchange, and chlorophyll fluorescence parameters were studied in two different maize hybrids Zhengdan 958 (drought resistant) and Shaandan 902 (drought-sensitive) under three different drought stresses (mild drought, moderate drought, severe drought) and normal irrigation in a pot experiment.The results showed that drought stress inhibited plant growth and relative growth rate in the two hybrids, resulting in a significant decline in biomass.With the increasing of drought stress, the maximum leaf net photosynthetic rate (Pnmax), apparent quantum efficiency (AQY), light saturation point (LSP), stomatal conductance (Gs), stomatal limitation (Ls), maximum electron transport rate (ETRn), photosynthetic efficiency (α),PSⅡ actual quantum yield (φPSⅡ) and photochemical quenching (qp) decreased, while the intercellular CO2 concentration (Ci),light compensation point (LCP) and non-photochemical quenching (qN) increased.But the change extents of all parameters were smaller in Zbengdan 958 than in Shaandan 902.This finding indicated that drought stress could significantly decrease the biomass of two maize hybrids, possibly caused by reduction in the photosynthetic efficiency of plants.The drought stress damaging effects on plant growth and photosynthesis were minimal on the Zhengdan 958 compared to Shaandan 902.Under drought stress the Zhengdan 958 maintained higher photosynthetic efficiency, stronger light energy transfer capacity and greater relative growth rate that may be the major physiological traits in the adaptive capacity to drought conditions.关键词
玉米/干旱胁迫/光响应/叶绿素荧光参数/植株生长引用本文复制引用
张仁和,薛吉全,浦军,赵兵,张兴华,郑友军,卜令铎..干旱胁迫对玉米苗期植株生长和光合特性的影响[J].作物学报,2011,37(3):521-528,8.基金项目
本研究由国家重点基础研究发展计划(973计划)项目(2009CB118604).国家自然科学基金项目(30971722)和陕西省自然科学基金项目(2010JM3002)资助. （973计划）
