Regulation of soybean drought response by mepiquat chloride pretreatment

• DOI: 10.3389/fpls.2023.1149114
• Publication Date: 2023-05-08T04:43:02Z
• Authors: Xiyue Wang; Xinyu Zhou; Zhipeng Qu; Chao Yan; Chunmei Ma; Jun Liu; Shoukun Dong
• Keywords: Drought stress; Plant Science; Horticulture; Biochemistry; SB1-1110; Genetic Diversity and Improvement of Soybean; Agricultural and Biological Sciences; Malondialdehyde; soybean; growth characteristic; Molecular Responses to Abiotic Stress in Plants; Genomic Studies of Cotton Fiber Development and Improvement; Biology; 2. Zero hunger; drought stress; Plant culture; Life Sciences; Drought resistance; 15. Life on land; Drought tolerance; mepiquat chloride; 6. Clean water; Agronomy; Chemistry; physiology; Drought Tolerance; molecular mechanism; Antioxidant

Soybean is the world's most important cultivated crop, and drought can affect their growth and, eventually, yields. Foliar application of mepiquat chloride (MC) potentially alleviate damage caused by stress in plants; however, mechanism MC regulation soybean response has not been studied. This study investigated two varieties soybean, sensitive Heinong 65 (HN65) drought-tolerant Heinong44 (HN44), under three treatment scenarios, normal, stress, + conditions. promoted dry matter accumulation reduced plant height, decreased antioxidant enzyme activity, significantly malondialdehyde content. The light capture processes, photosystems I II, were inhibited; upregulation several amino acids flavonoids was observed. Multi-omics joint analysis indicated 2-oxocarboxylic acid metabolism isoflavone biosynthetic pathways to be core which regulated response. Candidate genes such as LOC100816177, SOMT-2, LOC100784120, LOC100797504, LOC100794610, LOC100819853 identified crucial for resistance soybeans. Finally, a model constructed systematically describe regulatory stress. fills research gap field resistance.