草业科学2024，Vol.41Issue(6)：1397-1406,10.DOI:10.11829/j.issn.1001-0629.2023-0175
野牛草雌、雄株对干旱胁迫的生理响应差异
Differences in the physiological responses of female and male Buchloe dactyloides plants to drought stress
摘要
Abstract
Buffalo grass is a rare dioecious turfgrass.Analyzing differences in drought resistance between male and female buffalo grass provides a theoretical basis for the study of physiological differences in dioecious plants.In this study,buffalo grass of the'Texoka'variety(Buchloe dactyloides)was used as the experimental material,and cloned branches of female and male plants were used for cutting propagation.Three drought stress treatments were applied after flat formation:normal watering/control(field water capacity,90％,CK);semi-drought(field water capacity,50％,H);and drought(field water capacity,30％,D).The results showed that the plant height,biomass,root-shoot ratio,leaf relative water content,and chlorophyll fluorescence parameters of female and male B.dactyloides did not change significantly with increasing drought severity.Malondialdehyde(MDA)and proline(PRO)contents in female plants were significantly higher than those in male plants,and were positively correlated with the degree of drought.Superoxide dismutase(SOD),peroxidase(POD),and ascorbate peroxidase(APX)activities differed significantly between female and male buffalo grass plants.In addition,the antioxidant enzyme activity of B.dactyloides was significantly higher in female plants than that in male plants under the same drought conditions;therefore,the ability to remove reactive oxygen species(ROS)is stronger in female plants than that in male plants.Consistent with these findings,two-factor and principal component analyses showed significant differences in the responses of male and female B.dactyloides plants to drought stress.Membership function analysis showed that the drought resistance of female buffalo grass was higher than that of male buffalo grass.In conclusion,our findings confirm that phenotypic gender differences impact the physiological responses of B.dactyloides to drought stress,with females displaying stronger drought resistance than that of their male counterparts under the same conditions.关键词
野牛草/雌雄异株/性别差异/抗氧化酶/抗旱性/隶属函数Key words
buffalo grass/dioecious/gender difference/antioxidant enzyme/drought resistance/membership function引用本文复制引用
刘牧野,郭丽珠,滕珂,滕文军,范希峰,岳跃森,武菊英..野牛草雌、雄株对干旱胁迫的生理响应差异[J].草业科学,2024,41(6):1397-1406,10.基金项目
北京市农林科学院科技创新能力建设专项(KJCX20210431、CZZJ202210) （KJCX20210431、CZZJ202210）
北京市农林科学院博士后科研基金项目(2020-ZZ-007) （2020-ZZ-007）
