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- Title
Relationships between stable isotope natural abundances (d<sup>13</sup>C and d<sup>15</sup>N) and water use efficiency in rice under alternate wetting and drying irrigation in soils with high clay contents .
- Authors
Zhenchang Wang; Jinjing Liu; Yaosheng Wang; Agathokleous, Evgenios; Hamoud, Yousef Alhaj; Rangjian Qiu; Cheng Hong; Minghao Tian; Hiba Shaghaleh; Xiangping Guo
- Abstract
Natural abundance of the stable isotope (d13C and d15N) 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 d13C 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 d13C and d15N as a physiological indicator of whole-plant water use efficiency (WUEwhole-plant). Three AWD regimes, I100 (30 mm flooded when soil reached 100% saturation), I90 (30 mm flooded when reached 90% saturation) and I70 (30 mm flooded when reached 70% saturation) and three soil clay contents, 40% (S40), 50% (S50), and 60% (S60), were included. Observed variations in WUEwhole-plant did not conform to theoretical expectations of the organs d13C (d13Corgans) of plant biomass based on pooled data from all treatments. However, a positive relationship between d13Cleaf and WUEET (dry biomass/evapotranspiration) was observed under I90 regime, whereas there were no significant relationships between d13Corgans and WUEET under I100 or I70 regimes. Under I100, weak relationships between d13Corgans 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 I70, weak relationships between d13Corgans and WUEET could be ascribed to (i) bigger cracks induced by waterlimited 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 d15N (d15Nshoot) across the three irrigation treatments, indicating that WUEwhole-plant is tightly associated with N metabolism and N isotope discrimination in rice. Therefore, d13C should be used cautiously as an indicator of rice WUEwhole-plant at different AWD regimes with high clay content, whereas d15N could be considered an effective indicator of WUEwhole-plant.
- Subjects
WATER efficiency; CLAY soils; STABLE isotopes; PLANT biomass; SOIL drying; PLANT-water relationships; CLAY
- Publication
Frontiers in Plant Science, 2022, Vol 13, p1
- ISSN
1664-462X
- Publication type
Article
- DOI
10.3389/fpls.2022.1077152