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草业学报 ›› 2023, Vol. 32 ›› Issue (6): 100-111.DOI: 10.11686/cyxb2022275

• 研究论文 • 上一篇    下一篇

白三叶耐铝种质筛选及耐铝评价指标分析

冯华昊(), 王涵, 周建祯, 张晗, 唐韬, 彭燕()   

  1. 四川农业大学草业科技学院,四川 成都 611130
  • 收稿日期:2022-06-28 修回日期:2022-07-29 出版日期:2023-06-20 发布日期:2023-04-21
  • 通讯作者: 彭燕
  • 作者简介:Corresponding author. E-mail: pengyanlee@163.com
    冯华昊(1996-),男,四川成都人,在读硕士。E-mail: 784574573@qq.com
  • 基金资助:
    天府杰出科学家项目(1863);四川省产业技术体系创新团队项目(SCCXTD-2020-16)

Screening of Al-tolerant white clover germplasm and analysis of Al-tolerance evaluation indexes

Hua-hao FENG(), Han WANG, Jian-zhen ZHOU, Han ZHANG, Tao TANG, Yan PENG()   

  1. College of Grassland Science and Technology,Sichuan Agricultural University,Chengdu 611130,China
  • Received:2022-06-28 Revised:2022-07-29 Online:2023-06-20 Published:2023-04-21
  • Contact: Yan PENG

摘要:

为评价西南地区白三叶种质耐铝性强弱,发掘优异材料,试验以采自四川、贵州地区的82份白三叶种质和生产中应用广泛的国审品种‘海法’(Haifa)、‘胡依阿’(Huia)为供试材料,使用水培方法,观测不同种质在铝胁迫(4 mmol·L-1)15 d的生长状况,利用隶属函数法初步筛选耐铝性差异材料。试验进一步通过观测9份初筛种质铝胁迫下的生长及生理变化,采用隶属函数法计算不同种质耐铝得分,采用主成分分析法分析不同耐铝评价指标贡献率,结合根尖苏木精染色结果,对白三叶种质进行耐铝性综合评价。结果表明:铝胁迫可引起供试白三叶株高、根长、干重、绿值、相对叶片含水量、叶绿素含量、最大光能转化效率及叶片健康指数显著下降(P<0.05);相对电导率和丙二醛含量显著增加(P<0.05);根尖活性铝含量增加。材料Tr016、Tr056、Tr060、Tr062、Tr077生长指标相对值的隶属函数得分排名靠前;而Tr009、Tr021、Tr040、Tr048、Tr075得分排名靠后。综合评价结果显示,材料Tr016、Tr060具有较强的耐铝性,而Tr021耐铝性较弱;主成分分析表明,铝胁迫下白三叶相对株高、相对根长和相对干重可作为生长鉴定指标,而光合参数(叶绿素含量、最大光能转化效率、叶片健康指数)及丙二醛含量可作为生理鉴定指标。该研究可为白三叶种质资源苗期耐铝性评价和新品种选育提供参考与基础材料。

关键词: 白三叶, 种质资源, 铝胁迫, 耐铝评价指标, 隶属函数法

Abstract:

In this study, we selected 82 white clover germplasm lines from Sichuan and Guizhou, as well as the widely used cultivars ‘Haifa’ and ‘Huia’ to evaluate the aluminum (Al) tolerance of white clover germplasm resources in southwest China, with a view to identifying superior germplasm resources for this region. Hydroponics was used to observe the growth parameters of different germplasm lines under Al exposure (4 mmol·L-1) for 15 days at the seedling stage, then we preliminarily screened nine lines with differing Al tolerance by subordinate function analysis. We further observed the growth and physiological changes of nine germplasm lines under Al tolerance. Subordinate function analysis was used to calculate the Al tolerance scores of the nine selected germplasm lines and principal component analysis was used to compare the contribution rates of different evaluation indexes, and hematoxylin staining was carried out to observe the active Al content of the germplasm lines. It was found that the growth and physiological performance of white clover were inhibited when the white clover germplasm lines suffered from Al toxicity. With Al toxicity, the shoot length (SL), root length (RL), dry weight (DW), greenness (G), relative water content (RWC), chlorophyll content (Chl), photochemical efficiency (Fv/Fm), and performance index (PI) of white clover were significantly decreased (P<0.05); While the electrolyte leakage (EL) and malondialdehyde content (MDA) of white clover were significantly increased (P<0.05) and the root tips of white clover were stained with hematoxylin. The preliminary evaluation of relative growth indexes showed that the white clover germplasm lines with strongest Al tolerance were Tr016, Tr056, Tr060, Tr062, and Tr077, while Tr009, Tr021, Tr040, Tr048, and Tr075 had relatively weak Al tolerance. The multivariate evaluation further confirmed Tr016 and Tr060 had the strongest Al tolerance, on the contrary, Tr021 had poor at Al tolerance. The principal component analysis suggested that, for the Al tolerance evaluation of white clover, the relative SL, RL and DW could be regarded as growth identification indexes, while identification indexes for physiological stress could use photosynthetic parameters (Chl, Fv/Fm, PI) and MDA. The results provide data on white clover Al tolerance to support selection and breeding decisions, as well as a reference information for evaluation systems to detect Al tolerance.

Key words: white clover, germplasm resources, aluminum tolerance, Al-tolerance evaluation indexes, subordinate function