Seed pre-soaking with brassinolide enhances photosynthetic resistance of foxtail millet seedlings under mesosulfuron-methyl plus iodosulfuron-methyl-sodium stress

文献类型： 外文期刊

第一作者： Ning, Na

作者： Ning, Na;Huang, Lei;Wang, Binqiang;Yuan, Xiangyang;Guo, Pingyi;Ning, Na;Huang, Lei;Wang, Binqiang

作者机构：

关键词： Brassinolide; photosynthetic physiology; seed presoaking; Setaria italica; sulfonyhirea herbicide

期刊名称：CHILEAN JOURNAL OF AGRICULTURAL RESEARCH （ 影响因子：1.917； 五年影响因子：1.99 ）

ISSN： 0718-5839

年卷期： 2022 年 82 卷 2 期

页码：

收录情况： SCI

摘要： The mixture of mesosulfuron-methyl + iodosulfuron-methyl-sodium (ME+IMS) as post-emergence dual-purpose herbicide exhibits phytotoxicity in foxtail millet (Setaria italica (L.) P. Beauv.) Reducing ME+IMS stress in foxtail millet is therefore of practical significance. This study assessed the effects of seed pre-soaking with different concentrations of brassinolide (0.01, 0.1, 1.0 and 2.0 mg L-1) on foxtail millet grown under ME+IMS (2.81+0.56 g ai ha(-1)) stress. The agronomic characteristics, photosynthetic pigment, gas exchange parameters, chlorophyll fluorescence and P-700 parameters of two foxtail millet cultivars ('Jingu 21' and 'Zhangza 5') were analyzed 7 d after ME+IMS treatment at the 5th leaf stage. Compared with ME+IMS treatment alone, brassinolide treatment within a concentration range of 0.1-1.0 mg L-1 had a positive effect on all plant parameters to varying degrees. Pre-soaking of seeds with 0.1 mg L-1 brassinolide increased the leaf area (41.8%), fresh mass (179.2%), net photosynthetic rate (P-n, 38.4%), transpiration rate (T-r, 61.5%), stomatal conductance (g(s), 103.1%), photosystem II maximum quantum yield (F-v/F-m, 8.6%), effective quantum yield (Y(II), 16.0%), electron transport rate (ETR(II), 17.8%), photosystem I photochemical quantum yield (Y(I), 16.7%) and electron transport rate (ETR(I), 38.7%) in 'Zhangza 5' leaves under ME+IMS stress. An increase in plant height (53.0%), total chlorophyll (38.3%), carotenoid contents (40.0%), and maximal P-700 change (P-m, 34.3%) were also observed following 1.0 mg L-1 brassinolide treatment compared with ME+IMS in 'Jingu 21'. Comprehensive analysis showed that pre-sowing seed treatment with 0.1-1.0 mg L-1 brassinolide could enhance the growth and photosynthetic resistance of foxtail millet seedlings to ME+IMS stress.

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