Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (23): 15-20.doi: 10.11924/j.issn.1000-6850.casb2021-0719

Special Issue: 生物技术

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Application of Plant Carbon Isotope Fractionation in the Study of Water Use Efficiency

SHI Ruilin(), ZHANG Qingfen, LI Ming, LI Quanqi, ZHANG Mingming()   

  1. College of Water Conservancy & Civil Engineering, Shandong Agricultural University, Taian, Shandong 271018
  • Received:2021-07-28 Revised:2021-10-17 Online:2022-08-15 Published:2022-08-08
  • Contact: ZHANG Mingming E-mail:shirl816@126.com;zhangmingming1990@126.com

Abstract:

Stable carbon isotope measurement is not limited by time and space, and the measurement process is simple and accurate. In order to eliminate the defects of conventional methods for measuring water use efficiency (WUE), stable carbon isotope tracing technology can be used in the WUE of indicator crops. The basic principle of stable carbon isotope fractionation was reviewed in this paper. The relationship between the stable carbon isotope fractionation characteristics and WUE, and the application of stable carbon isotope fractionation in drought resistance and water saving breeding were analyzed from plant organs, climate factors and water conditions. The stable carbon isotope fractionation characteristics of different photosynthetic plants show that WUE is correlated with carbon isotope ratio (δ13C) and carbon isotope resolution (Δ13C), and the δ13C values of different plant organs are different. Rainfall, light intensity and duration, and soil moisture have significant effects on the δ13C values and WUE. Therefore, δ13C and Δ13C, the two stable carbon isotope indexes can indicate the high WUE and drought resistance of plants better, and provide a theoretical basis for improving plant WUE and breeding drought-resistant varieties.

Key words: water use efficiency, correlation, stable carbon isotope fractionation, carbon isotope ratio, carbon isotope resolution

CLC Number: