| 摘要: |
| 【目的】明确腐植酸(HA)对干旱胁迫下燕麦叶片叶绿素荧光特性的调控效应。【方法】采用盆栽试验,研究了在正常供水、中度干旱胁迫、重度干旱胁迫3个水分条件下喷施HA对燕麦叶片叶绿素含量及荧光参数的影响。【结果】水分胁迫导致Chla+Chlb、Chla/Chlb、Fm、Fv、Fv/Fm、Fv/Fo和qP显著降低,而Fo和NPQ显著升高。干旱胁迫下喷施HA与CK相比,Chla+Chlb 提高0.6%～40.82%、Chla/Chlb提高1.13%～30.09%、Fm提高0.7%～121.19%、Fv提高1.0%～171.79%、Fv/Fm提高0.2%～83.89%、Fv/Fo提高1.9%～211.56%、qP提高0.1%～68.30%、NPQ提高 6.02%～73.36%、而Fo降低0.70%～14.06%,其中在重度干旱胁迫下均达到显著差异。【结论】干旱胁迫对燕麦PSⅡ光反应系统产生明显伤害,喷施腐植酸可缓解其影响,且在重度干旱胁迫条件下效果最明显。 |
| 关键词: 腐植酸;燕麦;干旱胁迫;叶绿素;叶绿素荧光参数 |
| DOI： |
| 分类号:S158；S512.6 |
| 基金项目:国家燕麦荞麦产业技术体系项目(CARS-08-B-5)；燕麦加工技术研究与旱作高产栽培示范推广项目 |
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| Regulatory effect of humic acid on chlorophyll fluorescence characteristics of oat under drought stress |
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LI Linghao1,2, LIU Jinghui1,2
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1.Oat Scientific and Technical Innovation Team,Inner Mongolia Agricultural University,Hohhot,Inner Mongolia 010019;2.China
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| Abstract: |
| 【Objective】The effects of humic acid (HA) on the chlorophyll fluorescence of oat leaves under drought stress were determined. 【Method】 The effects of spraying HA on chlorophyll content and fluorescence parameters of oat leaves under normal water supply, moderate drought stress and severe drought stress were studied by pot experiment.【Results】Water stress caused a significant decrease in Chla+Chlb, Chla/Chlb, Fm, Fv, Fv/Fm, Fv/Fo and qP, while Fo and NPQ were significantly increased. Compared with CK under drought stress, Chla+Chlb increased by 0.6%~40.82%, Chla/Chlb increased by 1.13%~30.09%, Fm increased by 0.7%~121.19%, Fv increased by 1.0%~171.79%, Fv/Fm Increase 0.2%-83.89%, Fv/Fo increase 1.9%~211.56%, qP increase 0.1%~68.30%, NPQ increase 6.02%～73.36%, and Fo decrease 0.70%～14.06%, which under heavy drought stress Significant differences.【Conclusion】Drought stress caused obvious damage to the PSII photoreaction system of oats. Spraying humic acid could alleviate its effects, and the effect was most obvious under severe drought stress. |
| Key words: Humic acid; Oat; Drought stress; Chlorophyll; Chlorophyll fluorescence parameters |
