Effects of water stress and nitrogen supply on leaf gas exchange and fluorescence parameters of Sophora davidii seedlings

被引：156

作者：

Wu, F. Z. ^{[1
,2
]}

Bao, W. K. ^{[1
]}

Li, F. L. ^{[1
,2
]}

Wu, N. ^{[1
]}

机构：

[1] Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

来源：

PHOTOSYNTHETICA | 2008年 / 46卷 / 01期

关键词：

adaptation; chlorophyll fluorescence; intercellular CO2 concentration; leaf area; net photosynthetic rate; respiration rate; specific leaf area; stomatal conductance; water use efficiency;

D O I：

10.1007/s11099-008-0008-x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Two-month-old seedlings of Sophora davidii were subjected to a randomized complete block design with three water (80, 40, and 20 % of water field capacity, i.e. FC80, FC40, and FC20) and three N supply [N0: 0, Nl: 92 and Nh: 184 mg(N) kg(-1)(soil)] regimes. Water stress produced decreased leaf area (LA) and photosynthetic pigment contents, inhibited photosynthetic efficiency, and induced photodamage in photosystem 2 (PS2), but increased specific leaf area (SLA). The decreased net photosynthetic rate (P (N)) under medium water stress (FC40) compared to control (FC80) might result from stomatal limitations, but the decreased P (N) under severe water deficit (FC20) might be attributed to non-stomatal limitations. On the other hand, N supply could improve photosynthetic capacity by increasing LA and photosynthetic pigment contents, and enhancing photosynthetic efficiency under water deficit. Moreover, N supply did a little in alleviating photodamages to PS2 caused by water stress. Hence water stress was the primary limitation in photosynthetic processes of S. davidii seedlings, while the photosynthetic characters of seedlings exhibited positive responses to N supply. Appropriate N supply is recommended to improve photosynthetic efficiency and alleviate photodamage under water stress.

引用

页码：40 / 48

页数：9

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