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Effects of water deficit and nitrogen application on leaf gas exchange, phytohormone signaling, biomass and water use efficiency of oat plants

文献类型： 外文期刊

作者： Li, Li 1 ; Ma, Haiyang 1 ; Xing, Jiayi 1 ; Liu, Fulai 2 ; Wang, Yaosheng 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing, Peoples R China

2.Univ Copenhagen, Fac Sci, Dept Plant & Environm Sci, Hojbakkegaard 13, DK-2630 Taastrup, Denmark

3.Chinese Acad Trop Agr Sci, South Subtrop Crops Res Inst, Zhanjiang, Peoples R China

关键词： delta C-13; drought stress; nitrogen; phytohormone

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE （ 影响因子：2.426； 五年影响因子：3.029 ）

ISSN： 1436-8730

年卷期：

页码：

收录情况： SCI

摘要： Background: Water and nitrogen (N) are essential resources influencing plant growth and yield. To improve their efficiencies in crop production is challenging because the physiological mechanisms of water and N coupling and their interactive effect on crop water use efficiency (WUE) are not well understood yet. Aim: The aim of this study was to investigate the physiological responses and phytohormones signaling in oats in response to soil water status and N supply under fertigation, to explore the mechanisms regulating plant growth and WUE. Methods: Oat plants were subjected to the factorial combination of three soil moisture regimes (50, 70, and 90% of soil water holding capacity, SWHC) and three N levels (fertilized with 74, 149, and 298 mg kg(-1)). Results: The stomatal conductance (g(s)) was significantly decreased by soil water deficit, and also by the highest N level, whereas photosynthesis rate (A(n)) was unaffected by neither water nor N. Consequently, intrinsic WUE (WUEint, A(n)/g(s)) was highest under reduced irrigation and high N fertilization. This effect at stomatal level was affirmed by responses in whole plant WUE (WUEb), which was positively correlated with shoot delta C-13. A positive correlation between delta O-18 and delta C-13 in shoots further indicated that decreases of g(s)rather than changes in A(n)contributed to the enhanced WUE. Conclusion: Moderate soil water deficit and sufficient N supply is recommended for saving irrigation water and improving WUE on fertigated oat plants without compromising biomass accumulation to any large extent.

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