两份老芒麦种质材料萌发期抗旱性评价  

Evaluation of Drought Tolerance of two Elymus Sibiricus Germplasm During Germination

作　　者：徐婉宁 孙群策 张树振[1] 杨金钰[2] 彭凤君 熊洁 张博[1] XU Wanning;SUN Qunce;ZHANG Shuzhen;YANG Jinyu;PENG Fengjun;XIONG Jie;ZHANG Bo(Xinjiang Key Laboratory of Grassland Resources and Ecology/College of Grassland Science of Xinjiang Agricultural University,Urumqi 830000,China;Research Institute of Soil Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences,Urumqi 830000,China)

机构地区：[1]新疆草地资源与生态重点实验室/新疆农业大学草业学院,乌鲁木齐830052 [2]新疆农业科学院土壤肥料与农业节水研究所,乌鲁木齐830091

出　　处：《草食家畜》2023年第5期45-50,共6页Grass-Feeding Livestock

基　　金：国家牧草产业技术体系项目(CARS-34);青藏高原种质资源研究与利用实验室开放课题(2023-SYS-05)。

摘　　要：【目的】本试验以同德老芒麦和DJ-01老芒麦的种子为试验材料,探究2份老芒麦种子萌发期的抗旱性。【方法】试验采用-0.1MPa、-0.3MPa、-0.5MPa、-0.7MPa、-1.0MPa的高分子渗透剂聚乙二醇-6000(PEG-6000)溶液模拟干旱胁迫,以蒸馏水为对照组(CK),测定两份老芒麦种子的发芽指标及其抗旱系数。【结果】当胁迫水势低于-0.1MPa时,老芒麦种子发芽率降至22%以下,发芽势降至10%以下;当胁迫水势低于-1.0MPa时,老芒麦种子均不萌发;当胁迫水势为-0.1~-0.3MPa时,利于老芒麦胚根的生长。【结论】干旱胁迫均抑制了两份老芒麦种子的萌发,且随着干旱胁迫强度的增强,其发芽率、发芽势、相对发芽率、相对发芽势等均呈现下降趋势;当胁迫水势较低时,干旱胁迫对老芒麦胚根的生长具有促进作用。【Objective】In this experiment,'Tongde'Elymus sibiricus and'DJ-01'Elymus sibiricus were used as test materials to investigate the drought tolerance during the germination period.【Methods】The experiment was conducted to simulate drought stress by using-0.1,-0.3,-0.5,-0.7,and-1.0 MPa of polymer osmotic agent polyethylene glycol-6000(PEG-6000),and distilled water as the control group(CK)to determine the germination indexes of the two Elymus sibiricus germplasm materials and their drought coefficients.【Results】When the stress water potential was lower than-0.1MPa,the germination rate of Elymus sibiricus materials decreased to less than 22%,and the germination potential decreased to less than 10%;when the stress water potential was lower than-1.0MPa,none of the Elymus sibiricus material germinated;when the stress water potential was-0.1~-0.3MPa,it was favorable to the germinal root growth of Elymus sibiricus.【Conclusion】Drought stress inhibited the germination of all the Elymus sibiricus materials,and showed a decreasing trend of germination rate,germination potential,relative germination rate,relative germination potential and other indexes of Elymus sibiricus with the increase of the intensity of drought stress;when the stress water potential was lower,the drought stress had a favorable effect on the growth of Elymus sibiricus radicle.

关 键 词：老芒麦 干旱胁迫 种子萌发 抗旱性评价 

分 类 号：S543.9[农业科学—作物学]