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PJB-2022-1509

Brassinolide alleviates glufosinate-ammonium toxicity by enhancing photosynthesis and nitrogen metabolism in Trichosanthes kirilowii

Yan Wu, Xiangxiang Wang, Xiaoyan Qiao and Qinghai Gao
DOI:10.30848/PJB2022-2(4)


Abstract

This paper explored the alleviation of brassinolide (BR) to Trichosanthes kirilowii Maxim cv. WanLou No.9 (WL9) seedlings under the stress of herbicide glufosinate-ammonium (GA). The results showed that under GA stress, a reduction in chlorophyll content, photosynthetic rate, and light energy utilization rate of WL9 seedlings has occurred. In addition, a significant decline in the activities of nitrogen metabolism-related enzymes, such as nitrate reductase (NR), glutamine synthetase (GS) and glutamate synthase (GOGAT), were also observed. Furthermore, amino acid synthesis in the leaves was inhibited, resulting in a large accumulation of ammonium nitrogen. Application of BR, however, could significantly enhance chlorophyll content, photosynthetic rate, and light energy utilization efficiency of WL9 seedlings under GA stress, besides promoting the key enzymatic activities of nitrogen metabolism. Among them, leaf NR and GS activities were 27.5 µgNaNO2·g-1FW·h-1 and 5.6 µmolGHA·g-1FW·min-1 respectively, which were 74.8% and 60.0% higher than that of GA treatment. In addition, BA promoted the synthesis of amino acids, and the ammonium nitrogen content in leaves was remarkably reduced. Application of BA alleviated the inhibition of GA on the growth of WL9 seedlings, which was 1.34 and 1.21 times higher than that of GA treatment in shoot and root respectively. In conclusion, GA reduced the light energy utilization efficiency and nitrogen metabolic capacity of WL9 seedlings, while application of BA could alleviate the toxicity of GA on light energy utilization and nitrogen metabolism of WL9 seedlings

To Cite this article: Wu, Y., X. Wang, X. Qiao and Q. Gao. 2022. Brassinolide alleviates glufosinate-ammonium toxicity by enhancing photosynthesis and nitrogen metabolism in Trichosanthes kirilowii. Pak. J. Bot., 54(1): DOI: http://dx.doi.org/10.30848/PJB2022-2(4)  
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