Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (29): 96-102.doi: 10.11924/j.issn.1000-6850.casb2021-1134

Special Issue: 生物技术 小麦 农业气象

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Responses of Photosynthetic Parameters and Yield of Winter Wheat at Filling Stage to Soil High Humidity and Drought Change

REN Sanxue1,2(), QI Yue2(), TIAN Xiaoli3, ZHAO Huarong1   

  1. 1Chinese Academy of Meteorological Sciences, Beijing 100081
    2Institute of Arid Meteorology,China Meteorological Administration, Key Laboratory of Arid Climate Change and Reducing Disaster of CMA,Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province, Lanzhou 730020
    3Gucheng Agro-meteorological National Field Observation and Research Station, China Meteorological Administration, Baoding, Hebei 072656
  • Received:2021-11-25 Revised:2022-01-21 Online:2022-10-15 Published:2022-10-14
  • Contact: QI Yue E-mail:656892rzr@163.com;goodqiyue@163.com

Abstract:

To study the influencing mechanism of soil moisture on photosynthetic parameters and yield change of winter wheat, an experiment was conducted with 4 treatments of soil high humidity (W1), moderate drought (W2), severe drought (W3) and control (CK) using artificially controlled irrigation in the rainproof shed, to study the effects of soil moisture change on the photosynthetic parameters and yield of winter wheat at the filling stage. The results showed that: the net photosynthetic rate, transpiration rate and stomatal conductance of winter wheat during the filling stage decreased with the decrease of soil moisture. The intercellular CO2 concentration of W3 was similar to that of CK, and the main reason for the decrease of photosynthesis was non-stomatal restriction. The effectively utilized light intensity range of winter wheat leaf of W1 was expanded, while the effectively utilized light intensity range by leaves was narrowed due to soil drought stress. Night respiration of leaves under soil high humidity and drought stress were both increased. Drought stress reduced photosynthesis during the day, enhanced night respiration, and consumed more nutrients. ‘One decrease and one increase’ was the physiological reason for the grain collapse and low yield. High soil moisture and drought could affect the source-sink matching of dry matter transport and accumulation in winter wheat grains during grain filling stage. The green organs of the leaves under high humidity treatment dominated the transport of photosynthetic products, and the dry matter transport and contribution rates of the vegetative organs before flowering became smaller. Under drought stress, the photosynthetic products of green organs such as leaves were less, and the dry matter transported by grains was reduced. However, the dry matter transport and contribution rates of the vegetative organs before anthesis were increased relatively. The harvest index of soil high humidity was basically similar to that of the control, while the harvest index of the drought treatment was obviously smaller than that of the control.

Key words: winter wheat, photosynthetic parameters, yield, soil high humidity, drought

CLC Number: