Physiology and metabonomics reveal differences in drought resistance among soybean varieties

被引:33
作者
Wang, Xiyue [1 ]
Li, Yongping [1 ]
Wang, Xiaojing [1 ]
Li, Xiaomei [2 ]
Dong, Shoukun [1 ]
机构
[1] Northeast Agr Univ, Coll Agr, Harbin 150030, Peoples R China
[2] Harbin Acad Agr Sci, Harbin 150029, Peoples R China
关键词
Soybeans; Drought stress; Metabolomics; Physiological indicators; STRESS; BIOSYNTHESIS; MECHANISMS; TOLERANCE; RESPONSES; PROLINE;
D O I
10.1186/s40529-022-00339-8
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Background The soybean is an important food crop worldwide. Drought during the first pod stage significantly affects soybean yield, and understanding the metabolomic and physiological changes in soybeans under drought stress is crucial. This study identified the differential metabolites in initial pod stage soybean leaves under polyethylene glycol-simulated drought stress, using ultra performance liquid chromatography and tandem mass spectrometry, and the physiological indexes related to drought resistance. Results Physiologically, drought resistance also generates enzyme and antioxidant activity; levels of superoxide dismutase, peroxidase, and catalase first increased and subsequently decreased, while those of soluble sugar, soluble protein, malondialdehyde, and proline content increased in both varieties. The contents of CAT, proline and soluble sugar in Heinong 44 (HN44) were higher than those in Heinong 65 (HN65), and the contents of MDA were lower than those in HN65. In metabolomics, the OPLS-DA model was used to screen different metabolites. KEGG analysis showed that the two varieties resisted drought through different ways. Amino acid metabolism and lipid metabolism play a key role in drought resistance of the two varieties, respectively. TCA cycle was one of the core pathways of drought resistance in two varieties. Changes in the content of l-Asparagine and citric acid may be one of the reasons for the difference in drought resistance between the two varieties. Conclusions We think that the reasons of drought resistance among soybean varieties are as follows: the main metabolic pathways are different under drought stress; the contents of metabolites in these metabolic pathways are different; some physiological indexes are different, such as MDA, CAT, proline content and so on. Our study enhances the understanding of the metabolomic soybean drought stress response and provides a reference for soybean drought resistance breeding.
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页数:15
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