| 草地早熟禾对干旱及旱后复水的生理响应研究 |
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| 引用本文： | 杜建雄,侯向阳,刘金荣.草地早熟禾对干旱及旱后复水的生理响应研究[J].草业学报,2010,19(2):31-38. |
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| 作者姓名： | 杜建雄 侯向阳 刘金荣 |
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| 作者单位： | 1.甘肃农业大学草业学院,甘肃 兰州730070;2.兰州大学草地农业科技学院,农业部草地农业生态系统学重点开放实验室,甘肃 兰州730020;3.中国农业科学院草原研究所,内蒙古 呼和浩特 010010;4.贵州财经学院资源与环境管理学院,贵州 贵阳 550004 |
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| 基金项目： | 甘肃省自然科学基金，甘肃省教育厅科研项目，农业部草地农业生态系统学重点开放实验室项目资助 |
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| 摘 要： | 为了进一步明确冷季型草坪草形态、水分生理和碳分配模式对干旱及复水处理的反应,本试验以草地早熟禾草的3个栽培种:新歌来德、午夜和奖金为材料,进行人工模拟干旱处理21d,然后再恢复浇水21d。期间测定了草坪质量、叶片相对含水量(RWC)、总的非结构性碳水化合物(TNC)含量及14C同化物在根、茎、叶的分配率。试验结果表明,干旱胁迫造成3个品种的草坪质量和RWC明显下降,变化幅度因品种和处理时间不同而存在差异;复水后,草坪质量和RWC不同程度地得到恢复,其中奖金表现出较强的恢复能力。干旱胁迫初期,3个品种根部14C分配率明显增加,干旱14d时,3个品种14C分配模式为:根＞茎＞叶。随着干旱胁迫的进行,14C由根部向茎和叶片转移,其茎和叶片中14C分配率明显升高。复水21d后,3个品种中14C分配率模式为:茎＞叶＞根;干旱胁迫期间,3个品种的叶片、茎和根之间TNC积累量一直发生变化,干旱胁迫21d时,3个品种TNC含量在根、茎、叶中的积累模式为:叶＞茎＞根。复水后,3个品种根、茎、叶中TNC积累量较干旱胁迫21d时各自对应器官中TNC积累量有不同程度下降,但TNC在根、茎、叶中的积累模式与干旱胁迫期间保持一样。试验结果表明,在干旱和复水处理中碳同化物在植物体内不同器官不同分配率及碳水化合物在植物体内不同器官中积累是草坪草对干旱胁迫及复水处理的一种生理调节反应,将为今后研究草坪草在其他逆境胁迫下的抗性提供了一定的科学参考。
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| 关 键 词： | 干旱胁迫 复水 (14)C分配 总的非结构性碳水化合物 |
| 收稿时间： | 1900-01-01; |
A study on physiological response to drought and re-watering treatments in Kentucky bluegrass |
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| DU Jian-xiong,HOU Xiang-yang,LIU Jin-rong.A study on physiological response to drought and re-watering treatments in Kentucky bluegrass[J].Acta Prataculturae Sinica,2010,19(2):31-38. |
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| Authors: | DU Jian-xiong HOU Xiang-yang LIU Jin-rong |
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| Institution: | 1.College of Grassland, Gansu Agricultural University, Lanzhou 730070, China; 2.Key Laboratory of Grassland Agro-Ecosystem Ministry of Agriculture College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China; 3.Grassland Research Institute of Chinese Academy of Agricultural Science, Huhehaote 010010, China; 4.School of Resources and Environmental Management, Guizhou College of Finance and Economics, Guiyang 550004, China |
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| Abstract: | The morphology, water physiology, and carbon allocation responses of cool-season turfgrass to drought stress and re-watering treatments were studied. Three cultivars (Prize, Nuglade, and Midnight) of Kentucky bluegrass (Poa pratensis), were tested under drought and re-watering treatments to determine the changes in turf quality, leaf relative water content (RWC), total nonstructural carbohydrate (TNC) content and ~(14)C allocation in different organs. Drought stress caused a significant decline in turf quality and leaf RWC, which varied with cultivar and treatment time. After re-watering, turf quality and leaf RWC recovered to different degrees, especially in Prize. At the early stages during drought stress, ~(14)C allocation to the roots increased significantly for all cultivars. After 14 d drought stress, ~(14)C allocation to different organs in the three cultivars was roots＞shoots＞leaves. With prolonged drought stress, some ~(14)C in the roots moved into the shoots and leaves, resulting in a marked increase of ~(14)C allocation to the shoots and leaves. After 21 d re-watering, ~(14)C allocation in the three cultivars was shoots＞leaves＞roots. During the drought stress, TNC accumulation in the roots, shoots, and leaves of the three cultivars continually changed and was in the sequence leaves＞shoots＞roots. After re-watering, the TNC content in the leaves, shoots, and roots of all three cultivars was lower than that under drought stress, but still in the same order. This suggests that the allocation of carbon assimilates and their accumulation in different organs of turfgrasses were a physiological adaptation response to drought and re-watering treatments and provides a scientific basis for further investigating the resistance of turfgrasses to other adverse environments. |
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| Keywords: | drought stress re-watering ~(14)C allocation total nonstructural carbohydrate |
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