海滨雀稗突变体抗旱性的评价  

The Evaluation on Drought Resistance of Mutants of Paspalum vaginatum

作　　者：徐彦花 谢新春 刘天增 张巨明 XU Yanhua1,2, XIE Xinchun1,2, LIU Tianzeng1,2, ZHANG Juming1,2(1 College of Forestry and Landscape Architecture, South China Agricultural University Guangzhou , Guangdong 510642, China 2 Guangdong Engineering Research Center for Grassland Science, Guang, zhou, Guangdong 510642, Chin)

机构地区：[1]华南农业大学林学与风景园林学院,广东广州510642 [2]广东省草业工程技术研究中心,广东广州510642

出　　处：《热带作物学报》2018年第2期246-253,共8页Chinese Journal of Tropical Crops

基　　金：广东省科技计划项目(No.2012B020302002);国家自然科学基金(No.31502011)

摘　　要：以3个海滨雀稗(Paspalum vaginatum)品种(Sea Isle2000、Platinum、Supreme)及其经辐射诱变筛选出的7个突变体为试验材料,在干旱胁迫条件下通过测定叶片相对含水量(RWC)、叶片相对电导率(REC)、脯氨酸(Pro)含量、可溶性总糖含量(TSC)及叶片萎蔫系数等5个生理指标,综合评价其抗旱性。结果表明:干旱胁迫导致试验材料的RWC下降,叶片萎蔫系数、Pro、TSC、REC上升,但不同品种材料的变化幅度不同。突变体"PL-40-1"、"PL-40-2"、"SP-40-2"在干旱胁迫下,其RWC下降幅度显著低于对照,叶片萎蔫系数、Pro、TSC、REC的上升幅度均明显低于对照,说明突变体"PL-40-1"、"PL-40-2"、"SP-40-2"叶片的保水能力较强,抗旱性优于其亲本;而突变体"SI-50-1"、"SI-50-5"、"SI-60-6"、"PL-40-8"抗旱性不及其亲本。The drought resistance of three Paspalum vaginatum varieties （Sea Isle2000, Platinum, Supreme） and 7 mutants induced by 60Co-γ from the three varieties were compared in the study. The five physiological indexes including leaf relative water content （RWC）, leaf relative conductivity （REC）, proline （Pro） content, soluble total sugar content（TSC） and leaf wilting coefficient under drought stress were measured to comprehensively evaluate the drought resistance of the varieties and mutants. The results showed that RWC of the three P. vaginatum varieties and 7 mutants decreased while leaf wilting coefficient, Pro, TSC and REC increased under drought stress condition. However the change levels of the above physiological indexes were different among different experimental plant materials. The decline levels of RWC of the mutants ＂PL-40-1＂, ＂PL-40-2＂ and ＂SP-40-2＂ were significantly lower than those of the control under drought stress while the increase levels of leaf wilting coefficient, Pro, TSC and REC were significantly lower than those of the control. It was indicated that the three mutants of ＂PL-40-1＂, ＂PL-40-2＂ and ＂SP-40-2＂ had a higher leaf water retentivity and better drought resistance than their parents whereas drought resistance of the mutants ＂SI-50-1＂, ＂SI-50-5＂, ＂SI- 60-6＂ and ＂PL-40-8＂ was inferior to their parents.

关 键 词：海滨雀稗 突变体 水分胁迫 抗旱性 

分 类 号：S543[农业科学—作物学]