干旱和遮荫对中国沙棘水碳平衡和黄酮化合物含量的影响  

Effects of Drought and Shading on Water Carbon Balance and Flavonoids Contents of Hippophae rhamnoides subsp.sinensis Rousi

作　　者：李晓庆[1] 刘永强 薛静茹 李俊鹏 韩有志[1] 王林[1] LI Xiao-qing;LIU Yong-qiang;XUE Jing-ru;LI Jun-peng;HAN You-zhi;WANG Lin(Forestry College,Shanxi Agricultural University,Jinzhong 030800,Shanxi,China)

机构地区：[1]山西农业大学林学院,山西晋中030800

出　　处：《林业科学研究》2023年第3期129-137,共9页Forest Research

基　　金：山西省重点研发计划项目(201903D221051);山西农业大学生物育种工程项目(YZGC139)。

摘　　要：[目的]研究干旱和遮荫对中国沙棘生长、水碳代谢和黄酮类化合物含量的影响有助于全面了解沙棘的生态适应性,同时有利于了解干旱和遮荫对沙棘黄酮类化合物含量的影响。[方法]本研究以中国沙棘为研究对象,比较了干旱(40%土壤水分饱和含水量)、遮荫(遮光50%)及二者交互处理下的水势、枝条导水损失率(PLC)、光合作用、生物量、非结构性碳水化合物(NSC)含量和黄酮类化合物含量的变化。[结果]干旱处理显著降低了中国沙棘的枝条水势、净光合速率、叶生物量、根和茎的NSC含量,显著增加了枝条PLC、根生物量;遮荫显著降低了净光合速率、叶生物量、根茎叶的NSC含量和黄酮含量,干旱和遮荫的共同作用显著增加了枝条PLC,降低了叶净光合速率、根茎叶生物量和NSC含量;且叶黄酮类化合物含量与枝条水势呈显著负相关。[结论]干旱会影响中国沙棘的水分状况、碳摄取,降低茎和根的NSC储藏,增加黄酮类化合物含量,遮荫会影响中国沙棘的光合速率、根茎叶的NSC储藏,干旱和遮荫的共同作用进一步降低了中国沙棘的水分输导能力、光合作用、生物量积累和NSC储藏,遮荫降低了中国沙棘对干旱胁迫的适应能力,适度干旱有利于沙棘黄酮类化合物的合成。[Objective]To study the effects of drought and shade on growth,water and carbon metabolism,and the flavonoid content of Hippophae rhamnoides subsp.sinensis Rousi for comprehensively understanding the ecological adaptability of sea-buckthorn and the response of flavonoid content to drought and shade.[Methods]The changes of water potential,branch hydraulic conductivity loss(PLC),photosynthesis,biomass,non structural carbohydrate(NSC)content and flavonoid content of Hippophae rhamnoides in drought(40%saturated soil water content),shading(50%shading)and their interaction were compared.[Results]Drought treatment significantly reduced branch water potential,net photosynthetic rate,leaf biomass,and NSC content in root and stem of Hippophae rhamnoides,and significantly increased the branch PLC and root biomass.Shading treatment significantly decreased the net photosynthetic rate,leaf biomass,NSC content of each part,and flavonoid content.The interaction of drought and shading significantly increased branch PLC,but decreased the leaf net photosynthetic rate,the biomass and NSC content of roots,stems and leaves.Moreover,there was a significant negative correlation between leaf flavonoids content and branch water potential.[Conclusion]Drought will affect water status and carbon uptake,reduce NSC storage in stems and roots,and increase flavonoids content in Hippophae rhamnoides.Shading will affect photosynthetic rate,and NSC storage of roots,stems and leaves,And the combination of drought and shade will further reduce the water transport capacity,photosynthesis,biomass accumulation and NSC storage of Hippophae rhamnoides.Shading will reduce the adaptability of Hippophae rhamnoides.to drought stress,and moderate drought is beneficial to the synthesis of flavonoids.

关 键 词：中国沙棘 遮荫 干旱 水分利用 碳平衡 黄酮 

分 类 号：S718.51[农业科学—林学]