| 野生老芒麦苗期耐旱性研究 |
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| 引用本文： | 王传旗,刘文辉,张永超,周青平.野生老芒麦苗期耐旱性研究[J].草业学报,2021,30(8):127-136. |
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| 作者姓名： | 王传旗 刘文辉 张永超 周青平 |
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| 作者单位： | 1.青海省青藏高原优良牧草种质资源利用重点实验室，青海大学畜牧兽医科学院，青海 西宁 810016;2.西南民族大学，四川 成都 610041 |
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| 基金项目： | 青海省科技厅重点实验室发展专项(2020-ZJ-Y03);青海省科技厅基础研究项目(2018-ZJ-968Q);“昆仑英才 乡村振兴人才”专项农业农村科技攻关团队资助 |
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| 摘 要： | 为探索川西北高原乡土植物老芒麦的耐旱性，以野生老芒麦为研究对象，采用盆栽控水法模拟干旱胁迫环境，分析了苗期老芒麦在干旱胁迫下的形态和生理指标的变化特点，为其抗旱性育种提供了重要的理论基础，并对利用其有效防治川西北高原高寒草地退化、沙化等生态灾害具有重要的现实意义。结果表明，随着干旱胁迫天数的增加，野生老芒麦株高、叶面积和地上部分生物量积累增长减缓，根系干重和相对电导率不断上升，相对存活率、叶绿素含量持续下降。干旱胁迫已对苗期老芒麦产生了不同程度的伤害，抑制了生长，并降低了存活率。干旱条件下，为汲取更多水分，老芒麦将更多的生物量分配到根部，同时，降低生长高度和叶面积，以促进水分有效运输和防止水分过度蒸发。经耐旱隶属度分析，供试的8份野生老芒麦材料耐旱性强弱顺序为：14-001>14-165>14-235>14-065>14-251>14-115>14-189>14-021。
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| 关 键 词： | 老芒麦 乡土植物 苗期 耐旱性 隶属函数 川西北高原 |
| 收稿时间： | 2020-12-08 |
| 修稿时间： | 2020-01-18 |
Studies on drought tolerance of wild Elymus sibiricus at the seedling stage |
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| WANG Chuan-qi,LIU Wen-hui,ZHANG Yong-chao,ZHOU Qing-ping.Studies on drought tolerance of wild Elymus sibiricus at the seedling stage[J].Acta Prataculturae Sinica,2021,30(8):127-136. |
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| Authors: | WANG Chuan-qi LIU Wen-hui ZHANG Yong-chao ZHOU Qing-ping |
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| Institution: | 1.Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau，Qinghai Academy of Animal Science and Veterinary Medicine，Qinghai University，Xining 810016，China;2.Southwest University for Nationalities，Chengdu 610041，China |
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| Abstract: | In this study， we evaluated the drought tolerance of Elymus sibiricus， a plant native to the Northwest Sichuan Plateau， in a pot experiment. Changes in the morphological and physiological characteristics of E. sibiricus under drought stress at the seedling stage were analyzed. The main results were as follows： as the period of drought stress extended， the rate of increase in plant height， leaf area， and aboveground biomass of E. sibiricus became slower， the root system dry weight and relative conductivity gradually increased， and the survival percentage and chlorophyll content gradually decreased. Drought stress caused different degrees of damage to E. sibiricus at the seedling stage， as indicated by growth inhibition and decreased survival. To absorb more water under drought conditions， E. sibiricus tended to distribute more biomass to the roots， and reduced biomass allocation to plant height and leaf area. These adaptations promoted effective water transport and prevented excessive evaporation of water. According to a subordinate degree analysis， eight wild E. sibiricus materials were ranked from most to least drought tolerant as follows： 14-001>14-165>14-235>14-065>14-251>14-115>14-189>14-021. These findings provide an important theoretical basis for the breeding of drought-resistant E. sibiricus， and have practical significance for effectively controlling ecological disasters such as degradation and desertification of alpine grassland on the Northwest Sichuan Plateau. |
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| Keywords: | Elymus sibiricus native plant seedling stage drought tolerance subordinate function Northwest Sichuan Plateau |
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