白花泡桐叶片和细根对干旱胁迫的协同响应  

Coordinated responses of Paulownia fort unei leaves and fine roots to drought stress

作　　者：刘新宇 李湘 郭冰林 孔德良 范国强[1] 赵振利[1] LIU Xinyu;LI Xiang;GUO Binglin;KONG Deliang;FAN Guoqiang;ZHAO Zhenli(College of Forestry,Henan Agricultural University,Zhengzhou 450046,China)

机构地区：[1]河南农业大学林学院,河南郑州450046

出　　处：《河南农业大学学报》2024年第6期928-935,共8页Journal of Henan Agricultural University

基　　金：国家自然科学基金项目(32171746);河南农业大学高层次人才引进启动费项目(30500854);河南省留学人员科研择优资助经费项目(30602423)。

摘　　要：【目的】探究干旱胁迫下白花泡桐叶片与细根协同响应的规律和机制。【方法】以白花泡桐(Paulownia fortunei)幼苗为试验材料,选取若干盆栽苗,采取控水法,设置正常供水、轻度干旱、重度干旱3个水分处理,研究干旱胁迫下白花泡桐幼苗叶片和细根协同响应的机制。【结果】随着干旱程度的增加,白花泡桐叶脉直径保持不变,而叶脉密度持续降低,叶片氮含量升高。叶脉密度与根呼吸速率、比叶面积和叶片氮含量负相关,与叶片厚度正相关;根呼吸速率与叶片厚度负相关,与比叶面积和叶片氮含量正相关。【结论】叶脉所表征的碳运输特征驱动了白花泡桐地上和地下器官对干旱的协同响应,未来对白花泡桐进行种质改良和利用时可以考虑优化叶脉性状特征。【Purpose】The objective of this experiment was to explore the rules and mechanisms of synergistic response of Paulownia fortunei leaves and fine roots under drought stress.【Method】The expe-rimental material was Paulownia fortunei seedlings.Several potted seedlings were selected,and a water control method was adopted to set up three water treatment gradients:normal water supply,mild drought and severe drought.The synergic response mechanism of leaves and fine roots of Paulownia seedlings under drought stress was studied.【Result】With the increase of drought degree,the vein diameter of Paulownia remained unchanged,while the vein density continued to decrease,and the leaf nitrogen content increased.Vein density was negatively associated with root respiration rate,specific leaf area and leaf nitrogen content,while it was positively associated with leaf thickness.Root respiration rate was negatively associated with leaf thickness,and positively associated with specific leaf area and leaf nitrogen content.【Conclusion】The carbon transport characteristics represented by leaf veins drive the coordinated responses of aboveground and underground organs of Paulownia paulownia to drought,and the optimization of leaf vein traits can be considered in future germplasm improvement and utilization of Paulownia paulownia.

关 键 词：干旱胁迫 叶片经济学性状 叶片水力学性状 根呼吸速率 

分 类 号：S718[农业科学—林学]