浙江农业学报 ›› 2020, Vol. 32 ›› Issue (1): 72-79.DOI: 10.3969/j.issn.1004-1524.2020.01.09

• 园艺科学 • 上一篇    下一篇

菜心耐热性评价及酶促抗氧化系统对高温胁迫的响应

庞强强, 周曼, 孙晓东, 张文, 蔡兴来*   

  1. 海南省农业科学院 蔬菜研究所,海南省蔬菜生物学重点实验室,海南省瓜菜育种工程技术研究中心,海南 海口571100
  • 收稿日期:2019-05-09 出版日期:2020-01-25 发布日期:2020-03-11
  • 通讯作者: *蔡兴来,E-mail:13307531052@163.com
  • 作者简介:庞强强(1987—),男,安徽宿州人,硕士研究生,研究实习员,主要从事蔬菜栽培与育种。E-mail:qiang2017@sina.cn
  • 基金资助:
    2017年海南省重大科技计划(ZDKJ2017001); 海南省重点研发计划(ZDYF2019066)

Evaluation of heat tolerance and response of enzymatic antioxidant system to heat stress in Brassica parachinensis L.

PANG Qiangqiang, ZHOU Man, SUN Xiaodong, ZHANG Wen, CAI Xinglai*   

  1. Vegetable Research Institute for Hainan Provincial Academy of Agricultural Sciences, Hainan Provincial Key Laboratory for Vegetable and Biology, Hainan Provincial Engineering Research Center for Melon and Vegetable Breeding, Haikou 571100, China
  • Received:2019-05-09 Online:2020-01-25 Published:2020-03-11

摘要: 为鉴定不同菜心品种的耐热性,以热害指数为评价指标对19份材料进行耐热性评价,并在此基础上研究了酶促抗氧化系统对人工模拟高温胁迫及恢复的响应。结果表明:通过热害指数分析,筛选出耐热品种5个、中等耐热品种11个、不耐热品种3个。对耐热品种CX10、中等耐热品种CX17和不耐热品种CX13进行人工模拟高温处理发现,37 ℃高温胁迫时菜心叶片的电导率、MDA含量显著升高,SOD、POD和CAT的活性,以及Mn-SODPODCAT基因表达量显著增加。从增加幅度来看,耐热材料中的电导率、MDA含量增幅明显低于不耐热材料,SOD、POD和CAT的活性,以及Mn-SODPODCAT基因表达量则以耐热材料中增幅最大。在胁迫恢复3 d时,与胁迫时相比,所有指标均呈下降趋势,但仍高于对照。以上结果说明,高温胁迫影响了菜心酶促抗氧化系统的正常代谢,即使高温解除后也不能恢复至正常状态,但耐热材料可通过调节自身的酶促系统减轻胁迫带来的伤害。

关键词: 菜心, 耐热性, 酶促抗氧化系统, 高温胁迫

Abstract: In order to identify the heat tolerance of different varieties of Brassica parachinensis L., heat damage index was used as an evaluation index to evaluate the heat tolerance of 19 materials. On this basis, the response of enzymatic antioxidant system to simulated high temperature stress was studied. The results showed that through the analysis of heat damage index, 5 heat-resistant varieties, 11 medium heat-resistant varieties and 3 heat-sensitive varieties were screened out. The heat-resistant variety CX10, medium-heat-resistant variety CX17 and heat-sensitive variety CX13 under high temperature treatment showed that conductivity, MDA contents, activities of SOD, POD and CAT, expression levels of the related genes Mn-SOD, POD and CAT were increased compared with the control. The increase of conductivity and MDA content in heat-resistant varieties was significantly lower than that in heat-sensitive varieties. SOD, POD and CAT activity, as well as the expression of Mn-SOD, POD and CAT genes in the heat-resistant varieties, increased largest. After 3 days' recovery, compared with the treatment under stress, all indicators showed a downward trend, but higher than the control. These results indicated that high temperature stress affected the normal metabolism of enzymatic antioxidant system in Brassica parachinensis L. Even after high temperature was relieved, it could not return to the normal state. However, heat-resistant varieties could alleviate the damage caused by stress by regulating their protective system.

Key words: Brassica parachinensis L., heat tolerance, enzymatic antioxidant system, heat stress

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