Melatonin enhances drought resistance by regulating leaf stomatal behaviour, root growth and catalase activity in two contrasting rapeseed (Brassica napus L.) genotypes
文献类型：期刊论文
| 作者 | Dai, Lulu; Li, Jun; Harmens, Harry; Zheng, Xiaodong; Zhang, Chunlei |
| 刊名 | PLANT PHYSIOLOGY AND BIOCHEMISTRY
 |
| 出版日期 | 2020-04 |
| 卷号 | 149页码:86-95 |
| 关键词 | Brassica napus Drought Gas exchange Melatonin Root antioxidants Root structure Stomatal behaviour |
| ISSN号 | 0981-9428 |
| 英文摘要 | Two contrasting rapeseed (Brassica napus L.) genotypes, Qinyou 8 (drought-sensitive) and Q2 (drought-tolerant), were studied under drought stress with or without pretreatment with melatonin to (i) explore whether melatonin enhances drought resistance by regulating root growth and (ii) determine the relationship between the belowground and aboveground responses to melatonin under drought stress. Results show that the light-saturated rate of photosynthesis (P-n), stomatal conductance (g(s)), water use efficiency (WUE) and chlorophyll content were decreased by drought for Qinyou 8, whereas drought only decreased P-n and chlorophyll content for Q2. Drought decreased actual photochemical efficiency in saturated light (F-v'/F-m'), actual photochemical efficiency (PhiPS.), quenching of photochemical efficiency (qL) and electron transport rate (ETR) in Qinyou 8. However drought only decreased F-v'/F-m' and qL in Q2. Drought increased malondialdehyde (MDA) and hydrogen peroxide (H2O2) contents in the roots of both genotypes. Melatonin had no significant additional effects on root guaiacol peroxidase (POD) and superoxide dismutase (SOD) activities, but enhanced root catalase (CAT) activity of droughted plants further. Melatonin promoted taproot and lateral root growth under drought stress. Melatonin also promoted stomatal opening resulting in enhanced photosynthesis in the two genotypes. The two mechanisms induced by melatonin synergistically enhance drought resistance of rapeseed as indicated by enhanced gas exchange parameters under melatonin pretreatment. The findings provide evidence for a physiological role of melatonin in improving drought resistance, especially in belowground parts. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/44376]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Dai, Lulu,Li, Jun,Harmens, Harry,et al. Melatonin enhances drought resistance by regulating leaf stomatal behaviour, root growth and catalase activity in two contrasting rapeseed (Brassica napus L.) genotypes[J]. PLANT PHYSIOLOGY AND BIOCHEMISTRY,2020,149:86-95. |
| APA | Dai, Lulu,Li, Jun,Harmens, Harry,Zheng, Xiaodong,&Zhang, Chunlei.(2020).Melatonin enhances drought resistance by regulating leaf stomatal behaviour, root growth and catalase activity in two contrasting rapeseed (Brassica napus L.) genotypes.PLANT PHYSIOLOGY AND BIOCHEMISTRY,149,86-95. |
| MLA | Dai, Lulu,et al."Melatonin enhances drought resistance by regulating leaf stomatal behaviour, root growth and catalase activity in two contrasting rapeseed (Brassica napus L.) genotypes".PLANT PHYSIOLOGY AND BIOCHEMISTRY 149(2020):86-95. |
入库方式： OAI收割
来源：生态环境研究中心
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