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园艺学报 ›› 2019, Vol. 46 ›› Issue (12): 2437-2448.doi: 10.16420/j.issn.0513-353x.2019-0145

• 研究报告 • 上一篇    下一篇

不同夏菊品种的耐热性研究

孔令接,陈言博,王亚琴*   

  1. 华南师范大学生命科学学院,广东省植物发育生物工程重点实验室,广州 510631
  • 出版日期:2019-12-25 发布日期:2019-12-25
  • 基金资助:
    广东省科技计划项目(2016A020208013);国家重点研发计划项目(2018FYD1000400)

Studies on Heat Tolerance of Different Summer Chrysanthemum Cultivars

KONG Lingjie,CHEN Yanbo,and WANG Yaqin*   

  1. Guangdong Provincial Key Laboratory of Biotechnology for Plant Development,School of Life Sciences,South China Normal University,Guangzhou 510631,China
  • Online:2019-12-25 Published:2019-12-25

摘要: 以从南京引进的夏菊‘丰韵里’、‘早黄’、‘四季菊’、‘奥运金葵’(简称‘奥金’)、‘奥运彩蝶’(简称‘奥彩’)、‘奥运红星’(简称‘奥红’)和广东本地菊为试验材料,分别在苗期和花期进行高温胁迫处理,研究其对高温胁迫的耐受性,以期筛选出适合在中国南方热带地区种植的夏菊品种。试验结果表明:与本地菊相比,幼苗期高温胁迫下‘奥金’热害症状不明显,丙二醛含量和电导率增加幅度低,细胞损伤较轻,脯氨酸含量显著增加,叶绿素含量较稳定,恢复常温后存活率最高,热激基因CmHSP70(heat shock protein 70)、CmHSP90(heat shock protein 90)、CmHSP(heat shock protein)和CmsHSP(small heat shock protein)的表达量在高温胁迫1 h后显著增加,达到最高。花期高温胁迫后‘奥金’萎蔫程度以及各项生理指标均与苗期结果一致。而其他品种无论在苗期还是花期,‘丰韵里’耐热性均次于‘奥金’、‘早黄’;‘四季菊’与本地菊耐热程度相似,次于‘丰韵里’;‘奥红’和‘奥彩’耐热性最差。综上,‘奥金’的耐热性最强,适合在南方热带地区种植。

关键词: 夏菊, 高温胁迫, 耐热, 生理指标

Abstract: In order to select the most suitable cultivar for planting in the tropical area of southern China,the tolerance toward high temperature stress of six summer chrysanthemum cultivars were studied. The summer chrysanthemum cultivars introduced from Nanjing,including‘Fengyunli’,‘Zaohuang’,‘Sijiju’,‘Aoyunjinkui’(referred to as‘Aojin’),‘Aoyuncaidie’(referred to as‘Aocai’),‘Aoyunhongxing’(referred to as‘Aohong’),and the Guangdong local chrysanthemum were used to be treated under high temperature stress at seedling and flowering stages,respectively. The results showed that the seedlings of‘Aojin’had no obvious heat injury under high temperature stress. Compared with those of the Guangdong local chrysanthemum,the cells were more stable in the heat-treated seedlings of ‘Aojin’,supported by the evidence that the increased extents of malondialdehyde(MDA)content,conductivity and chlorophyll degradation were smaller in‘Aojin’. Moreover,the proline content in the ‘Aojin’seedlings was significantly increased,and the survival rate of‘Aojin’seedlings was highest after recovery. In addition,the expression levels of heat shock genes CmHSP70,CmHSP90,CmHSP and CmsHSP in the‘Aojin’seedlings were increased significantly and reached the highest point after 1 h of high temperature treatment. The degrees of wilting and the physiological indexes of the‘Aojin’flowers under high temperature stress were consistent with those from the seedling treatment. According to the performance of these cultivars in both seedling and flowering stages,the heat resistance of‘Fengyunli’was inferior to‘Aojin’,while the heat resistance of‘Zaohuang’or‘Sijiju’was similar to that of Guangdong local chrysanthemum,which was inferior to‘Fengyunli’,and the heat resistance of‘Aohong’and‘Aocai’was worst. Collectively,our study indicated that‘Aojin’is the best heat-resistant cultivar and is suitable for planting in the tropical area of southern China.

Key words: summer-flowering chrysanthemum, high temperature stress, heat resistance, physiological index

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