摘要
为探讨不同狗牙根种质对干旱及旱后复水的适应性差异,采用自然干旱方式,对18份狗牙根种质干旱及旱后复水下的7项生理指标进行测定,明确其抗旱及旱后恢复能力差异,筛选表现优异种质,同时利用灰色关联度法筛选抗旱及旱后恢复关键指标。结果表明:干旱第12 d,各种质叶绿素a、叶绿素b、总叶绿含量、叶片相对含水量均显著降低,而相对电导率、丙二醛、脯氨酸含量均显著升高;隶属函数分析发现供试种质干旱胁迫D值为0.056~0.725,旱后恢复D值为0.239~0.828;其中C136、C75、C92干旱胁迫D值较高,分别为0.725、0.670、0.537;而C121、C92、C136旱后恢复D值较高,分别为0.828、0.767、0.721;其中C136、C92、C100、C22的抗旱和旱后恢复能力均高于4个对照品种。灰色关联度分析表明,叶绿素a含量与抗旱能力关联度高;叶片相对含水量与旱后恢复能力关联度高,可作为评价狗牙根抗旱性的重要指标。
To evaluate the differences in drought adaptability and post-drought recovery among various bermudagrass(Cynodon dactylon)germplasms,this study assessed seven physiological indices in 18 germplasms under drought stress and subsequent rewatering,using a natural drought simulation method.The study aimed to clarify the variations in drought resistance and recovery capacity,identify superior germplasm,and determine key indicators through grey correlation analysis.The results showed that by the 12th day of drought,the contents of leaf chlorophyll a,chlorophyll b,total chlorophyll,and relative water content decreased significantly,whereas relative electrical conductivity,malondialdehyde,and proline contents increased significantly.Membership function analysis revealed that the D value for drought stress ranged from 0.056 to 0.725,while the D value for recovery after drought ranged from 0.239 to 0.828.Under drought stress conditions,germplasms C136,C75,and C92 showed higher D values(0.725、0.670、0.537,respectively).In terms of post-drought recovery,C121,C92 and C136 had the highest D values(0.828、0.767、0.721,respectively).Among the germplasms,the drought resistance and post-drought recovery capabilities of C136,C92,C100 and C22 were all higher than those of the four control variety.Grey correlation analysis indicated that chlorophyll a content was highly correlated with drought resistance,while leaf relative water content was highly correlated with post-drought recovery ability.These parameters can serve as important indicators for evaluating drought tolerance in bermudagrass.
作者
喻启坤
汤丽斯
李雯
韩宇
李培英
孙宗玖
YU Qikun;TANG Lisi;LI Wen;HAN Yu;LI Peiying;SUN Zongjiu(College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Key Laboratory of Grassland Resources and Ecology,Urumqi 830052,China;Key Laboratory of Grassland Resources and Ecology of Western Arid Region,Ministry of Education,Urumqi 830052,China)
出处
《中国草地学报》
北大核心
2025年第6期78-89,共12页
Chinese Journal of Grassland
基金
新疆维吾尔自治区重点研发项目(2023B02031)。
关键词
狗牙根
抗旱评价
旱后恢复能力
种质资源
Bermudagrass
Drought resistance evaluation
Post-drought recovery ability
Germplasm resources
作者简介
喻启坤(1998-),男,江苏扬州人,在读博士生,主要从事草种质资源评价方面研究,E-mail:895056461@qq.com;通信作者:李培英,E-mail:lpy@xjau.edu.cn。
