干旱胁迫下新疆杨树冠不同高度叶片水分状况与非结构性碳动态
投稿时间:2021-05-08  修订日期:2021-06-07  点此下载全文
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陈图强 中国科学院新疆生态与地理研究所 830011
徐贵青 中国科学院新疆生态与地理研究所 830011
刘深思 中国科学院新疆生态与地理研究所 830011
米晓军 中国科学院新疆生态与地理研究所 830011
李彦 中国科学院新疆生态与地理研究所 830011
基金项目:新疆维吾尔自治区天山青年计划项目(2020Q025)、新疆维吾尔自治区自然科学基金(2019D01A98)和中国科学院前沿科学重点研究项目(QYZDJ-SSW-DQC014)
中文摘要:水力结构调整及非结构性碳动态对于认知干旱胁迫下植物生存前景和死亡发生风险至关重要。本文以新疆杨(Populus bolleana Lauche)为对象,通过水分处理,分析树冠不同高度叶片水力性状、光合生理特性、不同功能器官间的可溶性糖、淀粉及非结构性碳水化合物(NSC)含量变化,以甄别树冠不同高度叶片对干旱胁迫的生理响应和适应差异。研究结果表明:(1)在干旱胁迫下,树冠上部的叶水势、叶含水量、枝条含水量普遍要低于下部,饱和膨压渗透势及膨压损失点水势在不同树冠高度间差异不显著,树冠上部枝条木质部发生栓塞的风险大于下部;(2)干旱处理组植株光合速率随树冠高度的增加而降低,叶绿素SPAD值在树冠的上部显著低于下部,而水分利用效率在树冠的上部要高于下部,表明受干旱胁迫的植株在生理上进行了适应性调整;(3)干旱处理组比叶面积在各树冠高度下显著低于对照组,而胡伯尔值在中部及上部要高于对照组,但差异不显著,干旱胁迫使新疆杨在形态上有所改变;(4)干旱处理使得树冠上部叶片的淀粉含量显著高于下部,枝条的可溶性糖及NSC含量在树冠上部显著高于下部,韧皮部的可溶性糖、淀粉及NSC含量在不同树冠高度间无显著差异;细根的可溶性糖、淀粉及NSC含量在不同试验处理下的差异不显著;干旱胁迫会导致NSC在不同器官之间的分配及组分产生差异。
中文关键词:新疆杨  干旱胁迫  水力性状  气体交换特征  非结构性碳水化合物  
 
Leaf water status and non-structural carbohydrate dynamics between different crown height levels of P. bolleana under drought stress
Abstract:Adjustment of hydraulic architechure and dynamic in non-structural carbohydrates are crucial for understanding the survival prospects and mortality risks of plants under drought stress. In the current study, we use Populus bolleana Lauche as the target species. By analyzing the changes of leaf hydraulic traits, photosynthetic physiological characteristics, non-structural carbohydrate (NSC) contents and their components under different water treatment with contrasting,canopy heights,we explore the differences in physiological responses and adaptations of leaves at different hight. Our research showed that : (1) during June to August, for the drought treatment group, the leaf water potential, leaf water content and branch water content in the upper part of tree crown were generally lower than those in the lower part; the osmotic potential at full turgor and the water potential at turgor loss point were not significant differences among different canopy heights; in summary, the risk of embolism in the upper branch xylem was greater than that in the lower part of the tree crown; (2) under drought stress, the photosynthetic rate decreased with the increase of canopy height, the chlorophyll SPAD value was significantly lower in the upper part of the canopy than in the lower part, while the water use efficiency was higher in the upper part of the canopy than in the lower part, which indicated that Populus bolleana Lauche had made physiological adjustment under drought stress; (3) the specific leaf area under drought treatment was significantly lower than that of the control at each crown height, while the Huber value in the middle and upper part was higher than that of the control, but the difference was not significan; drought stress changed the morphology of Populus bolleana Lauche; (4) the starch content of leaves in upper crown was significantly higher than that in lower crown under drought treatment; the soluble sugar and NSC contents in the upper part of the tree crown were significantly higher than those in the lower part of the tree crown; the content of soluble sugar, starch and NSC in phloem had no significant difference among different crown heights; the contents of soluble sugar, starch and NSC in fine roots had no significant difference among different water treatments; drought stress can cause differences in the distribution and composition of NSC among different organs.
keywords:P. bolleana  drought stress  hydraulic traits  gas exchange characteristics  non-structural carbohydrates  
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