文献类型：期刊文献

中文题名：不同光环境对紫背天葵和白背三七生长及光合荧光特性的影响

英文题名：Growth,Photosynthesis and Fluorescence Characteristics of Begonia fimbristipula and Gynura divaricata under Different Light Conditions

作者：成向荣[1] 舒骏[1] 刘佳[1,2] 王婉[1] 虞木奎[1]

第一作者：成向荣

机构：[1]中国林业科学研究院亚热带林业研究所;[2]西北农林科技大学林学院

年份：2014

卷号：34

期号：7

起止页码：1426-1431

中文期刊名：西北植物学报

外文期刊名：Acta Botanica Boreali-Occidentalia Sinica

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：浙江省省院合作林业科技项目(2011SY10);杭州市青蓝计划项目(20121432K08)

语种：中文

中文关键词：紫背天葵;白背三七;光合作用;叶绿素荧光;光环境

外文关键词：Begonia fimbristipula ; Gynura divaricata ; photosynthesis ; fluorescence ; light conditions

分类号：Q945.79

摘要：以紫背天葵(Begonia fimbristipula)和白背三七(Gynura divaricata)两种优良野生蔬菜为研究对象,研究了自然全光照(L0)、郁闭度约50%林下(L1)、郁闭度约70%林下(L2)3种光环境下植株的生长及光合和荧光参数变化,以明确其耐荫性以及林下套种的可行性。结果显示:(1)紫背天葵和白背三七地径和株高在L0和L1处理之间无显著差异,而在L2处理下显著低于L0。(2)两种野菜最大净光合速率(Pmax)、光饱和点(LSP)、光补偿点(LCP)均随光照强度减弱逐渐降低,表观量子效率(AQY)在3种光环境下无显著差异;PSⅡ潜在最大量子产量(Fv/Fm)、光化学荧光猝灭系数(qP)和电子传递速率(ETR)也随光照强度减弱而减小,非光化学荧光猝灭系数(NPQ)却随光照强度减弱而增加。(3)两种野菜光合和荧光参数在L0和L1处理之间无显著差异,而在L2处理下显著低于L0。研究表明,在较大郁闭度林分下,紫背天葵和白背三七叶片叶绿素分子捕获激发能的效率降低,其PSⅡ吸收光能用于光化学电子传递的份额减少,而用于热耗散的份额增加,电子传递活性和通过电子传递链传递的能量降低,净光合速率下降,植株生长受到抑制;两种野菜均具有一定的耐阴性,可以在林分郁闭度50%左右的林下正常生长。
Begonia fimbristipula and Gynura divaricata are natural vegetables.Growth,photosynthesis and fluorescence characteristics of these two vegetables were studied under three light conditions [Full light （L0）,50％ canopy cover（L1）,and 70％ canopy cover（L2）].The results showed that：（1）The height and ground diameter of B.fimbristipula and G.divaricata were no significant differences between L0 and L1 treatments（P＞0.05）,the two variables were markedly lower in L2 treatment than those of L0 treatment（P ＜0.05）.（2）The maximal net photosynthetic rate（P）,light compensation point（LCP）,and light saturation point（LSP） reduced with decreasing light intensity,no significant difference was found in apparent quantum yield（AQY） among the three light conditions.With the decrease of light intensity,the maximal photochemical efficiency of photosystem Ⅱ （Fv/Fm）,photochemical quenching index（qP）,photosynthetic electron transport rate（ETR） also reduced,while non photochemical quenching index（NPQ） increased.（3）The values of these photosynthesis and fluorescence variables of the two vegetables were no significant difference between L0 and L1 treatments,whereas these variables were significantly lower in L2 treatment than those of L0 treatment.In L2 treatment,the efficiency of capture excitation energy reduced for chloro phyll molecules of these two vegetables leaves,the amount of light energy was absorbed by photosystem Ⅱ decreased for photochemical electron transfer and increased for heat loss,electron transport activity and en ergy which was used to electron transport chain also declined,which led to the decrease of net photosynthetic rate,so plant growth was inhibited.These two vegetables have moderate shade tolerance,they can normally grow under the plantation with 50％ canopy cover.