| To clarify the influence of exogenous alpha-ketoglutaric acid(α-KG) spraying after anthesis on the photosynthesis of wheat flag leaves and the characteristics of grain filling, Shumai 830 and Shumai 1868, with significant differences in thousand-grain weight, were selected as materials. Using no spraying as the contrel(CK), 0.50, 0.75, and 1.00 g·L-1 concentrations of α-KG spraying at 0 d and 15 d after anthesis were set up. The differences in chlorophyll content and photosynthetic parameters of flag leaves, grain-filling parameters, and yield under different treatments were compared. The results indicated that compared with the CK, the α-KG treatment enhanced wheat photosynthesis and promoted grain filling, thereby increasing the grain weight of wheat. Among them, the treatment of 0.75 g·L-1 α-KG showed the best effects. Under the treatment with 0.75 g·L-1 of α-KG, the chlorophyll content at 21 d after anthesis and the net photosynthetic rate at 20 d after anthesis of Shumai 830 and Shumai 1868 were significantly higher than those of the CK, with an increase rate of 12.0% and 9.6% for chlorophyll content, and 11.1% and 6.6% for net photosynthetic rate, respectively. And the active grain-filling period, average grain-filling rate, and maximum theoretical thousand-grain weight of Shumai 830and Shumai 1868 were significantly higher than those of the CK, with an increase rate of 3.8%, 4.6%, and 7.9% for Shumai 830, and 1.6%, 4.9%, and 4.9% for Shumai 1868. After the treatment with 0.75 g·L-1 of α-KG, the thousand-grain weight of Shumai 830 and Shumai 1868 was increased by 3.8% and 2.7%, respectively, compared with CK, and the yield was increased by 6.2% and 7.9%, respectively, all showing significant difference from the CK. Thus, exogenous α-KG spraying after anthesis can promote photosynthesis and grain filling by increasing the chlorophyll content of wheat, and ultimately increase grain weight and yield. |
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