ZOU Jing-nan,JIN Xi-jun,WANG Meng-xue,et al.Effects of Exogenous Melatonin on Photosynthesis and Physiology of Soybean Seedlings under Drought Stress[J].Soybean Science,2018,37(06):896-905.[doi:1011861/jissn1000-98412018060896]
外源褪黑素对干旱胁迫条件下大豆苗期光合及生理的影响
- Title:
- Effects of Exogenous Melatonin on Photosynthesis and Physiology of Soybean Seedlings under Drought Stress
- Keywords:
- Soybean; Drought; Melatonin; Photosynthesis; Membrane lipid peroxidation
- 文献标志码:
- A
- 摘要:
- 为研究外源褪黑素对干旱胁迫下大豆的缓解作用,促进褪黑素在生产实际中的应用,本试验以大豆抗线9为供试品种,采用盆栽控水的方式模拟干旱胁迫,设置不同浓度褪黑素叶面喷施处理,研究外源褪黑素对干旱胁迫下大豆幼苗生长的调控效应,为实际生产提供理论基础和技术参考。结果表明:外源褪黑素可显著缓解干旱胁迫对大豆幼苗生长的抑制作用,与干旱胁迫相比,干旱胁迫下喷施100和200 μmol·L-1褪黑素处理促进叶面积和干物质积累总量,分别平均提高了804%和905%、676%和932%、1389%和1120%;显著提高了叶片光合参数、叶绿素荧光参数和相对含水量,其中Pn在第7和第14天分别提高了2288%和5457%,3972%和5753%,Tr分别提高了3701%和1899%,5965%和4517%;提高了抗氧化酶活性和渗透调节物质含量,降低了膜脂过氧化水平,其中SOD活性分别提高了4173%和2351%,1977%和1518%,MDA分别降低了3747%和2629%,3368%和1925%。综上所述,外源褪黑素可以提高干旱胁迫下大豆幼苗光合参数和叶绿素荧光参数,提高抗氧化酶活性进而促进ROS的清除,提高渗透调节物质含量有利于叶片保持较高的相对含水量,降低膜脂过氧化程度,从而提高大豆幼苗耐旱能力。
- Abstract:
- In order to study the alleviation effect of exogenous melatonin on soybean under drought stress, promoted the application of melatonin in production, this experiment used soybean [Glycine max [L] Merr] kang-xian 9 as the material by pot The effects of 100 and 200 μmol·L-1 exogenous melatonin on the photosynthesis, antioxidant system and growth by 30% field capacity under drought stress and rewatered soybean seedlings were studied The results showed that foliar application of melatonin under drought stress could alleviate the growth inhibition, leaf area index and dry matter caused by drought stress, 100 and 200 μmol·L-1 were more drought-treated, the stress plant height, leaf area and total dry matter increased by 804% and 905%, 676% and 932%, 1389% and 1120%, respectively Pn increased by 2288% and 5457%, 3972% and 5753%, respectively on 7th day and 14th day, and Tr increased by 3701% and 1899%, 5965% and 4517%, respectively, other photosynthesis, chlorophyll fluorescence and RWC were consistent, and also enhanced antioxidant enzyme activity and osmotic adjustment substances, reduced membrane lipid peroxidation level and better effect under rehydration conditions, where in SOD activity increased by 4173% and 2351%, 1977% and 1518%, respectively, and MDA decreased by 3747% and 2629%, 3368% and 1925%, respectively The other antioxidant enzyme activities, osmotic adjustment substances and membrane lipid peroxidation levels were consistent In summary, exogenous melatonin can improved photosynthetic parameters and chlorophyll fluorescence parameters under drought stress, increased antioxidant enzyme activity, clear ROS and reduced membrane lipid peroxidation, and improved osmotic adjustment substances to maintain higher RWC of leaves, to improved the drought tolerance of soybean seedlings
参考文献/References:
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备注/Memo
收稿日期:2018-09-08