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Key progress has been made in frost tolerance of wheat
Author:Zhou Yuchao   Approver:Zhang Meishen   Releaser:Jia Peiwen   Time:2022/07/27 16:40:52   Source:International Cooperation Division

Low temperature is one of the main factors that restrict the natural distribution and cultivation area of plants. Low temperature freezing injury directly affects the growth of crops and limits the yield. In serious cases, it may cause irreversible damage or even death of plants. According to statistics, among the various environmental factors that affect crop yield, the yield reduction caused by freezing injury occupied more than 40%. How to improve the frost resistance of plants has become an important scientific problem at present. Wheat is an important food crop in China. In recent years, the frequency of low temperature in spring in the Huang-Huai wheat region has increased, and the damage of production caused by low temperature stress has become more and more serious. Therefore, studying the mechanism of wheat low temperature damage and clarifying the regulatory mechanism of wheat response to low temperature will provide new ideas for screening cold tolerant wheat germplasm and breeding.

BMC plant biology recently published a research paper online by the the Institute of Cereals and Oil Crops of HAAFS entitled "Transcription-associated metabolomic profiling reveals the critical role of frost tolerance in wheat”. Based on the analysis of phenotype, physiology and biochemistry, metabonomics and transcriptomics, experts studied the characteristic relationship between cold resistance and metabonomics and transcriptomics during wheat seedling period, and revealed the effect of low temperature stress on the synthesis and accumulation of sucrose, amino acids and flavonols in wheat.

The research team took the wheat variety “Jimai 325” and the cold sensitive mutant “mu-134” as research materials. Compared with the untreated control, the peroxidase (POD) activity, proline (pro) content and soluble sugar content of “Jimai 325” and “mu-134” treated increased significantly by cold stress. The activities of catalase (CAT) and superoxide dismutase (SOD) increased significantly in “Jimai 325”, and the content of malondialdehyde increased significantly in “mu-134”. Through transcriptome and metabolome analysis, different genes and metabolites are mainly concentrated in biotin metabolism, phenylalanine, tyrosine and tryptophan biosynthesis, glycolysis / gluconeogenesis, starch and sucrose metabolism and other pathways, revealing that wheat may alleviate low temperature stress through a series of comprehensive energy metabolism and amino acid biosynthesis mechanisms. Finally, the candidate genes POD, Tacr7, UGTs and GSTU6 are related to the frost resistance of wheat, and can be used as transgenic or molecular marker assisted selection to promote the frost resistance of wheat.

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  Key words:wheat, frost resistance                View:181                  0