江西农业大学学报2015，Vol.37Issue(5)：867-873,7.DOI:10.13836/j.jjau.2015131
干旱胁迫对桔梗光合和叶绿素荧光特性的影响
Effects of Drought Stress on Photosynthetic and Chlorophyll Fluorescence Characteristics of Platycodon grandiflorus
摘要
Abstract
Controlled experiments of Platycodon grandiflorus were conducted with two sowing times in spring(March 17th) and autumn(October 20th).In this study,Platycodon grandiflorus seedlings were grown in pots with varying levels of soil water content to evaluate the effects of drought on photosynthetic parameter and chlorophyll fluorescence parameter and analyze the correlations between them.Specifically,the seedlings were subjected to four water treatments:75%-80%(normal water supply) ,60%-65%(light drought stress) ,45%-50%(moderate drought stress) and 30%-35%(severe drought stress) of the SRWC.The results showed that during drought stress,the stomatal limit was the main reason for the decline of Pn.Moreover,when subjec-ted to the same levels of drought stress,the values of Pn,Gs,Ci,Tr,WUE,Fv/Fm,Fv/Fo and qP were higher when sown in spring than in autumn,which indicated that the adaptability of the plant sown in autumn sowing to drought stress is greater than that of the plant sown in spring.关键词
桔梗/干旱胁迫/光合作用/叶绿素荧光Key words
Platycodon grandiflorus/drought stress/photosynthesis/chlorophyll fluorescence分类
农业科技引用本文复制引用
陈兰兰,郭圣茂,李桂凤,姚春娟,熊光康,赖晓莲..干旱胁迫对桔梗光合和叶绿素荧光特性的影响[J].江西农业大学学报,2015,37(5):867-873,7.基金项目
中央财政林业科技推广示范资金项目(JXTG[2013]11) （JXTG[2013]11）
