Effect of Waterlogging on Photosynthetic Characteristics of Wheat Flag Leaves during Grain Filling and Recovery Effect of Water Stress Relief

doi:10.3969/j.issn.1000-6362.2019.07.005

Abstract

Abstract: In this study, the effects on photosynthetic characteristic of flag leaf under the treatments at 6 days and 9 days during waterlogging and 3 days after relief of water stress were investigated using wheat cultivar Yannong 19 in pot culture both in 2015 and in 2016, respectively. The results showed that the net photosynthetic rate of wheat leaves at the filling stage was significantly reduced by waterlogging with differences in the extent of decline among all the treatments. The net photosynthetic rates (NPRs) of flag leaf after 6 days waterlogging (WL6) and 9 days waterlogging (WL9) were 82.0% and 71.5% of those of control treatment (CK), respectively. The NPRs of flag leaf under WL6 treatment were recovered after the water stress relieved for three days with the consistent performance of CK, while the NPR of flag leaf under WL9 treatment was recovered to 86.3% compared to that of CK with a significant difference. The SPAD values of wheat flag leaf showed a consistent trend with that of the NPR under waterlogging treatment after the water stress was relieved for three days. After the water stress was relieved, the photosynthetic characteristics of WL6 could be recovered better than those of WL9. During waterlogging, the intercellular CO₂ concentration of WL6 was significantly higher than that of the control, indicating that the NPR decrease of flag leaf after 6 days of waterlogging was due to non-stomatal factors. While the stomatal conductanceon leave under WL9 treatment decreased significantly, there was no significant change in intercellular CO₂ concentration. The results suggested that the low photosynthesis of wheat leaves after waterlogging for 9 days was mainly affected by non-stomatal factors regardless of the stomatal opening.

Key words: Wheat, Grain filling stage, Waterlogging, Photosynthetic rate, Restoration

WANG Hong-jie, LI Wen-yang, SHAO Qing-qin, XU Feng, ZHANG Cong-yu, YAN Su-hui. Effect of Waterlogging on Photosynthetic Characteristics of Wheat Flag Leaves during Grain Filling and Recovery Effect of Water Stress Relief[J]. Chinese Journal of Agrometeorology, 2019, 40(07): 460-466.

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