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草业学报 ›› 2024, Vol. 33 ›› Issue (8): 98-111.DOI: 10.11686/cyxb2023433

• 研究论文 • 上一篇    下一篇

14份乡土狼尾草材料幼苗的耐冷性综合评价

陆姣云(), 田宏, 熊军波, 吴新江, 刘洋(), 张鹤山()   

  1. 动物胚胎工程及分子育种湖北省重点实验室,湖北省农业科学院畜牧兽医研究所,湖北 武汉 430064
  • 收稿日期:2023-11-15 修回日期:2023-12-14 出版日期:2024-08-20 发布日期:2024-05-13
  • 通讯作者: 刘洋,张鹤山
  • 作者简介:E-mail: sdzhanghs@hbaas.com
    E-mail: liuyang430209@163.com
    陆姣云(1989-),女,甘肃兰州人,助理研究员,博士。E-mail: lujy111@126.com
  • 基金资助:
    湖北省农业科技创新中心项目:饲草资源培育及高值化利用(2021-620-000-001-021);湖北省农业科学院青年科学基金(2023NKYJJ17);财政部和农业农村部:国家现代农业产业技术体系资助

A multi-trait evaluation of cold resistance of 14 native Pennisetum alopecuroides germplasm lines at the seedling stage

Jiao-yun LU(), Hong TIAN, Jun-bo XIONG, Xin-jiang WU, Yang LIU(), He-shan ZHANG()   

  1. Hubei Key Laboratory of Animal Embryo Engineering and Molecular Breeding,Institute of Animal Science and Veterinary Medicine,Hubei Academy of Agricultural Science,Wuhan 430064,China
  • Received:2023-11-15 Revised:2023-12-14 Online:2024-08-20 Published:2024-05-13
  • Contact: Yang LIU,He-shan ZHANG

摘要:

为了探究低温胁迫对不同狼尾草材料幼苗生理特性的影响及综合评价不同材料的抗寒性。本研究采用泥炭土花盆培养法,对采集的14份乡土狼尾草种子发芽后的幼苗进行低温胁迫(25、4、0、-5 ℃)处理,并测定叶绿素含量、类胡萝卜素含量、抗氧化酶活性、丙二醛含量、渗透调节物质含量。采用主成分分析和隶属函数法对14份材料进行抗寒性评价。随低温胁迫的不断加重,供试狼尾草幼苗的叶绿素a、叶绿素b、总叶绿素、可溶性糖和脯氨酸含量以及过氧化氢酶活性呈先升后降的趋势,类胡萝卜素含量呈逐渐增大的趋势,超氧化物歧化酶活性呈逐渐增加的趋势,可溶性蛋白呈先升后降再略升的趋势,而过氧化物酶活性变化趋势不一致。光合作用相关的各指标之间显著正相关。主成分分析结果表明,低温胁迫下狼尾草的光合因子、质膜系统因子、渗透调节因子可作为抗寒性评价的综合指标。隶属函数综合评价D值结果显示,L10材料的抗寒性较强,L4、L1和L2材料的抗寒性相对较弱。采用隶属函数综合评价法所得结果更加准确客观、可靠性高,研究结果可为狼尾草抗寒性评价及耐低温种质资源的筛选提供参考。

关键词: 狼尾草, 抗寒性, 生理特性, 主成分分析, 隶属函数法

Abstract:

The aim of this study was to explore the effects of low temperature stress on the physiological characteristics of Pennisetum alopecuroides seedlings and to develop a multivariate evaluation of the cold resistance of different P. alopecuroides germplasm lines. Seedlings of 14 native P. alopecuroides germplasm lines were grown in peat soil in pots and subjected to low-temperature stress (25 °C as the control, and cold treatments at 4, 0, -5 °C). Then, the contents of chlorophylls, carotenoids, malondialdehyde, and osmoregulatory substances were determined, as well as antioxidant enzyme activity. The cold resistance of the 14 materials was evaluated by principal component analysis and the membership function method. As the low temperature stress became more severe, the contents of chlorophylls, soluble sugars, and proline as well as catalase (CAT) activity in the test seedlings first increased and then decreased, the carotenoid content and superoxide dismutase (SOD) activity increased gradually, the soluble protein content first increased, then decreased, and then slightly increased, whereas peroxidase (POD) activity showed a different trend. There were significant positive correlations among the photosynthesis-related indexes. The results of principal component analysis showed that photosynthetic factors, plasma membrane system factors, and osmotic regulatory factors of P. alopecuroides under low temperature stress could be used as traits for multivariate evaluation of cold resistance. On the basis of the D values obtained using the membership function multivariate evaluation method, L10 had strong cold resistance, while L4, L1, and L2 had weak cold resistance. The results obtained by the membership function evaluation method are accurate, objective, and reliable. Therefore, this method can be used for the evaluation of cold resistance and for screening low temperature-tolerant germplasm resources of P. alopecuroides.

Key words: Pennisetum alopecuroides, cold resistance, physiological property, principal component analysis, subordination function method