中国麻业科学2017，Vol.39Issue(1)：19-24,6.
不同程度荫蔽胁迫对苎麻光合特性的影响
Effects of Varying Shade Levels on Photosynthetic Characteristics of Ramie
摘要
Abstract
Light varies greatly both in time and space in the mountainous area where ramie is cultivated in China,which affects ramie growth and fiber yield.In order to investigate the effects of shade stress on photosynthetic characteristics of ramie,the ramie cultivar Chuanzhu 12 was grown in fields and subjected to varying shade stress (i.e.100％,55％ and 30％ of sunlight,respectively) for 6,12 and 18 days at vigorous vegetative growth stage.Then gas exchange traits and photosynthetic pigments were assessed.Results showed that net photosynthesis (Pn),stomatal conductance (Gs) and water use ef ciency (WUE) decreased substantially,while intercellular CO2 (carbon dioxide) (Ci) and Ci/Ca (Ca ∶ ambient CO2) changed conversely in response to shade stress.Moreover,chlorophyll a (Chl),Chl b,Chl a + b,carotenoids (Car),and Chl a + b/Car ratio increased while Chl a/b ratio decreased with aggravation of shade stress.All these results indicated acclimation responses of ramie to shade.Nonetheless,the effects were closely related with the low light intensity and the duration of shade.Hence high levels of shade should be avoided for optimal growth of ramie.关键词
苎麻/荫蔽胁迫/气体交换/叶绿素Key words
ramie/shade stress/gas exchange/chlorophyll分类
农业科技引用本文复制引用
赵思毅,黄承建,肖万林,王龙昌..不同程度荫蔽胁迫对苎麻光合特性的影响[J].中国麻业科学,2017,39(1):19-24,6.基金项目
国家自然科学基金项目(31271673) （31271673）
