Chinese Journal of Agrometeorology ›› 2025, Vol. 46 ›› Issue (11): 1628-1638.doi: 10.3969/j.issn.1000-6362.2025.11.009

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Effect of Water Regulation on Chlorophyll Fluorescence and Photosynthetic Characteristics of Wine Grapes during Fruit Setting-maturation Stage

ZHAO Tu-xiang, WANG Jing, JIANG Lin-lin, LI Na, YANG Yang, LI Fu-sheng, ZHANG Xiao-yu   

  1. 1.Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions,CMA/Ningxia Key Lab of Meteorological Disaster Prevention and reduction, Yinchuan 750002,China; 2. Yinchuan Meteorological Bureau,Yinchuan 750002; 3. Ningxia Meteorological Science Institute,Yinchuan 750002
  • Received:2025-01-06 Online:2025-11-20 Published:2025-11-18

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Abstract:

The effects of different water regulation on photosynthetic characteristics, chlorophyll fluorescence and theoretical yield of wine grapes were explored, in order to provide theoretical basis for the irrigation regime and cultivation management of wine grapes in the east foot of Helan mountain. Taking 8y old 'Cabernet sauvignon' grape trees as the test material, five different irrigation treatments were set from fruit setting to maturity stage: CK (local conventional irrigation volume), T1 (50% of the conventional irrigation volume), T2 (67% of the conventional irrigation volume), T3 (83% of the conventional irrigation volume) and full irrigation (T4), the effects of different irrigation treatments on the photosynthetic characteristics parameters, chlorophyll fluorescence, chlorophyll content and yield of grapes were analyzed. The results showed that: (1) compared with the CK treatment, deficit irrigation and full irrigation significantly reduced the maximum net photosynthetic rate (Pmax) and apparent quantum efficiency (AQE) of wine grapes, the main reason was that photosynthesis restricted by stomatal factor. (2) Treatment of T1 resulted in significant decreases in the contents of chlorophyll a, chlorophyll b, carotenoids and total chlorophyll, the differences of other treatments were not significant, and the differences in chlorophyll fluorescence parameters among different treatments were also not significant. This indicated that the T1 treatment was affected by both stomatal factors and non−stomatal factors, the differences of net photosynthetic rate (Pn) among other treatments were not closely related to non−stomatal factors. (3) The theoretical yield of the wine grapes under the conventional irrigation (CK) treatment was the highest, the yields of T3, T2 and T1 were reduced by 15.4%, 19.4% and 33.0% respectively compared with CK treatment. Both full irrigation and deficit irrigation would reduce the Pn of wine grapes, and thereby decreasing the yield of wine grapes. CK treatment was the optimal irrigation regime based on yield consideration.

Key words: Eastern foot of Helan mountain, Wine grape, Irrigation regime, Photosynthetic, Chlorophyll fluorescence, Yield