| 曹翠玲,杨力,胡景江.多效唑提高玉米幼苗抗旱性的生理机制研究[J].干旱地区农业研究,2009,27(2):153~158 |
| 多效唑提高玉米幼苗抗旱性的生理机制研究 |
| Promotion of drought tolerance in corn seedling by Paclobutrazol |
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| DOI：10.7606/j.issn.1000-7601.2009.02.28 |
| 中文关键词: 多效唑 玉米 抗旱性 生理机制 |
| 英文关键词:pp333 corn drought resistance physiological mechanism |
| 基金项目:* |
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| 摘要点击次数: 193 |
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| 中文摘要: |
| 以浚单20号玉米(Zea maysL varXundan20)为试材,利用砂培法研究了不同浓度生长延缓剂多效唑pp333对玉米幼苗抗旱性的影响。试验结果表明,提前喷施适宜浓度的pp333,能提高玉米幼苗在干旱条件下的抗旱性。干旱前喷施适宜浓度的pp333,可以减缓干旱胁迫对玉米幼苗叶片和根系膜透性的不良影响;促进玉米幼苗叶片在干旱条件下累积渗透调节物质,从而改善玉米幼苗叶片水分状态;同时降低干旱条件下玉米叶片的蒸腾速率,增加玉米叶片的水分含量;干旱条件下,提前喷施了pp333的玉米幼苗叶片叶绿素含量降低幅度减小,光合速率较高,气孔导度变小。硝酸还原酶活性降幅变小。从外部形态来看,喷施pp333的植株,叶片宽度增加,茎杆增粗,根冠比增加,单株生物量较对照水平为高。本试验结果显示,pp333能提高玉米幼苗的抗旱性,本试验条件下pp333最适宜的喷施浓度是0.3%。 |
| 英文摘要: |
| An experiment was conducted to study the effect of pp333 on promotiing drought tolerance of corn seedlings.The results showed that under the water stress the change of the membrane permeability of leaf and root was decreased under sprinkling PP333 treatment, and the osmotic substances was increased when pp333 sprayed on the leaf beforehand, and the transpiration rate was decreased under the sprinkling pp333 treatment, and the chlorophyll content and the photosynthesis rate was higher than those without sprinkling pp333 treatment, and the stomata conductance was fall under treatment of spraying pp333;under the water stress the nitrate reductase activity had a higher level when the pp333 sprayed beforehand.Moreover, under the water stress, the width of leaf, the diameter of shoot and the ratio of root/shoot were all increased, the single biomass of corn seedlings was the same as the control under the treatment of spraying pp333 beforehand.The conclusion was drawn that pp333 could enhance drought tolerance of corn seedlings, and the 0.3% was the optimal concentration for corn seedlings under this experimental condition. |
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