Relationships between stable isotope natural abundances (delta C-13 and delta N-15) and water use efficiency in rice under alternate wetting and drying irrigation in soils with high clay contents

文献类型： 外文期刊

第一作者： Wang, Zhenchang

作者： Wang, Zhenchang;Liu, Jinjing;Hamoud, Yousef Alhaj;Hong, Cheng;Tian, Minghao;Guo, Xiangping;Wang, Zhenchang;Liu, Jinjing;Hong, Cheng;Tian, Minghao;Guo, Xiangping;Wang, Yaosheng;Agathokleous, Evgenios;Hamoud, Yousef Alhaj;Qiu, Rangjian;Shaghaleh, Hiba

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关键词： alternate wetting and drying irrigation; soil clay content; delta C-13; delta N-15; water use efficiency; Oryza sativa L

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Natural abundance of the stable isotope (delta C-13 and delta N-15) in plants is widely used to indicate water use efficiency (WUE). However, soil water and texture properties may affect this relationship, which remains largely elusive. Therefore, the purpose of this study was to evaluate delta C-13 as affected by different combinations of alternate wetting and drying irrigation (AWD) with varied soil clay contents in different organs and whole plant and assess the feasibility of using delta C-13 and delta N-15 as a physiological indicator of whole-plant water use efficiency (WUEwhole-plant). Three AWD regimes, I-100 (30 mm flooded when soil reached 100% saturation), I-90 (30 mm flooded when reached 90% saturation) and I-70 (30 mm flooded when reached 70% saturation) and three soil clay contents, 40% (S-40), 50% (S-50), and 60% (S-60), were included. Observed variations in WUEwhole-plant did not conform to theoretical expectations of the organs delta C-13 (delta C-13(organs)) of plant biomass based on pooled data from all treatments. However, a positive relationship between delta C-13(leaf) and WUEET (dry biomass/evapotranspiration) was observed under I-90 regime, whereas there were no significant relationships between delta C-13(organs) and WUEET under I-100 or I-70 regimes. Under I-100, weak relationships between delta C-13(organs) and WUEET could be explained by (i) variation in C allocation patterns under different clay content, and (ii) relatively higher rate of panicle water loss, which was independent of stomatal regulation and photosynthesis. Under I-70, weak relationships between delta C-13(organs) and WUEET could be ascribed to (i) bigger cracks induced by water-limited irrigation regime and high clay content soil, and (ii) damage caused by severe drought. In addition, a negative relationship was observed between WUEwhole-plant and shoot delta N-15 (delta N-15(shoot)) across the three irrigation treatments, indicating that WUEwhole-plant is tightly associated with N metabolism and N isotope discrimination in rice. Therefore, delta C-13 should be used cautiously as an indicator of rice WUEwhole-plant at different AWD regimes with high clay content, whereas delta N-15 could be considered an effective indicator of WUEwhole-plant.

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