Analysis of drought resistance and DNA methylation level of resynthesized Brassica napus
YUAN Yi, ZHU Shuang, FANG Ting-Ting, JIANG Jin-Jin,*, WANG You-Ping*College of Bioscience and Biotechnology, Yangzhou University, Yangzhou 225009, Jiangsu, China
This study was supported by the National Natural Science Foundation of China.31771824 This study was supported by the National Natural Science Foundation of China.31771825 China and Jiangsu Postdoctoral Science Foundation.2014M561719 China and Jiangsu Postdoctoral Science Foundation.2015T80591 China and Jiangsu Postdoctoral Science Foundation.1401078B
Abstract Brassica napus, as one of the important resources of edible plant oil and forage protein, is a polyploid species with great economic value. However, it is sensitive to drought stress throughout whole lifecycle due to short domestication history and narrow genetic background. Thus, it is a main purpose to breed B. napus cultivar with high yield and drought resistance. In the present study, we compared the drought resistance among S1-S4 generations of resynthesized B. napus and diploid parents under different time periods of 15% PEG-6000 treatment. The different drought tolerance levels were assessed based on phenotype observation, leaf physiological indexes (MDA, soluble protein, SOD and POD). Accompanying with water content analysis, we found the drought tolerance showed a trend of B. oleracea > Bn-S3 > Bn-S4 > Bn-S1 > Bn-S2 > B. rapa. Under drought stress, POD and SOD activities in Bn-S3 and Bn-S4 were higher than these in other plants tested, and MDA content was decreased, indicating that Bn-S3 and Bn-S4 have better ability in clearing ROS, and defending from peroxidation damage. On the basis of HPLC analysis, the methylation level in all materials was the highest under drought stress of 12 h. And the methylation level in B. rapa was higher than that in others, that in Bn-S1 and Bn-S4 was between that in parents, while that in Bn-S2 and Bn-S3 was lower than that in parents. Methylation sensitive amplification polymorphism analysis also revealed multiple changes in methylation and demethylation level of resynthesized B. napus under drought stress, indicating methylation changes might be involved in plant drought tolerance. Keywords:resynthesized Brassica napus; B. rapa; B. oleracea;drought stress;DNA methylation
PDF (1343KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 袁溢, 朱双, 方婷婷, 蒋金金, 王幼平. 人工合成甘蓝型油菜抗旱性及DNA甲基化水平分析[J]. 作物学报, 2019, 45(5): 693-704. doi:10.3724/SP.J.1006.2019.84120 YUAN Yi, ZHU Shuang, FANG Ting-Ting, JIANG Jin-Jin, WANG You-Ping. Analysis of drought resistance and DNA methylation level of resynthesized Brassica napus[J]. Acta Agronomica Sinica, 2019, 45(5): 693-704. doi:10.3724/SP.J.1006.2019.84120
CK: 对照; DT: 干旱胁迫; Br: 白菜型油菜; Bo: 甘蓝; S1~S4: 人工合成甘蓝型油菜自交后代。 Fig. 2Relative water content and relative water retention in plants under drought stress of 12 h
CK: control; DT: drought stress; Br: B. rapa; Bo: B. oleracea; S1-S4: progenies of resynthesized B. napus.
A: 过氧化物酶活力; B: 丙二醛含量; C: 超氧化物歧化酶活力; D: 可溶性蛋白含量。平均值±标准误, n = 3。Br: 白菜型油菜; Bo: 甘蓝; S1~S4: 人工合成甘蓝型油菜自交后代。 Fig. 3Physiological indexes of plants under drought stress
A: POD activity; B: MDA content; C: SOD activity; D: soluble protein. Average value ± SD, n = 3. Br: B. rapa; Bo: B. oleracea; S1-S4: progenies of resynthesized B. napus.
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