季节性干旱对白皮乌口树(Tarenna depauperata Hutchins)水分状况、叶片光谱特征和荧光参数的影响

被引：13

作者：

张树斌 ^{[1
,2
]}

张教林 ^{[1
]}

曹坤芳 ^{[3
]}

机构：

[1] 中国科学院西双版纳热带植物园热带森林生态学重点实验室

[2] 中国科学院大学

[3] 广西大学林学院

来源：

植物科学学报 | 2016年 / 34卷 / 01期

关键词：

季节性干旱; 叶比导率; 叶片光谱特征; 非光化学淬灭; 环式电子传递;

D O I：

暂无

中图分类号：

S718.43 [树木生理学、生物化学、生物物理学];

学科分类号：

摘要：

干热河谷稀树灌丛常绿植物能够忍受长达半年以上的季节性干旱胁迫,但对这些常绿植物响应干旱胁迫的生理生态机制研究很少。本研究以干热河谷稀树灌丛优势常绿植物白皮乌口树(Tarenna depauperata Hutchins)为研究对象,分别在雨季和干季测定其叶片的水势、压力-体积曲线、气体交换参数、叶片光谱特征以及叶绿素荧光和P700的光能分配。结果显示:受严重季节性干旱胁迫的影响,与雨季相比,干季的凌晨叶片水势(Ψpd)下降至-4.5 MPa,水分传导的叶比导率(KL)下降了49.5%,叶绿素反射指数(NDVI)下降了40.6%,花青素反射指数(ARI)上升至0.074(约为雨季的12.3倍),并且雨季和干季的叶片水势、水分传导效率、叶绿素含量和花青素含量均差异显著(P<0.05)。与雨季相比,干旱导致光系统Ⅱ(PSⅡ)最大光化学量子效率(Fv/Fm)显著下降至0.72(P<0.05),即PSⅡ发生光抑制,而光系统Ⅰ(PSⅠ)的活性(Pm)未发生明显变化;干季叶片的最大非光化学淬灭(NPQ)增加了31%,而激发的最大环式电子传递速率(CEF)下降了66%。表明长期干旱胁迫使CEF的激发受到强烈抑制,即光能捕获效率的降低和NPQ的增强促进了白皮乌口树在长期干旱胁迫下的光保护。

引用

页码：117 / 126

页数：10

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