| 刘芯伶,彭玉婷,王云梅,夏惠,梁东,胡容平.外源褪黑素和脱落酸对干旱胁迫下猕猴桃幼苗生理特性的影响[J].干旱地区农业研究,2021,39(4):95~101 |
| 外源褪黑素和脱落酸对干旱胁迫下猕猴桃幼苗生理特性的影响 |
| Effects of exogenous melatonin and abscisic acid on physiological characteristics in kiwifruit seedlings under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2021.04.12 |
| 中文关键词: 褪黑素 脱落酸 干旱胁迫 生理特性 猕猴桃 |
| 英文关键词:melatonin abscisic acid drought stress physiological characteristics kiwifruit |
| 基金项目:四川省科技厅猕猴桃生物工程技术育种平台项目（2016NZ0105）;四川省猕猴桃提质增效绿色生产技术集成研究与示范（2019YFSY0041） |
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| 中文摘要: |
| 以盆栽‘金实1号’猕猴桃幼苗为材料，在干旱条件下进行根灌100 μmol·L-1 的褪黑素(MT)溶液和叶面喷施25 μmol·L-1的脱落酸(ABA)溶液及MT+ABA处理，探究外源MT与ABA对植物干旱胁迫的缓解作用及机理。结果表明：MT处理可使猕猴桃叶片相对含水量、叶片水势和SOD活性较干旱胁迫处理组分别提高9%、39%和134%，同时使丙二醛（MDA）与H2O2含量分别降低66%与7%；ABA处理可使叶绿素含量、净光合速率、干物质积累量和POD活性较干旱胁迫处理组分别提高7%、40%、52%和41%，使H2O2含量降低13.5%;MT+ABA处理的效果与ABA处理类似，可使净光合速率、干物质积累量与POD活性较干旱胁迫处理组分别增加29%、110%与35.5%，使MDA与H2O2含量分别降低44%、6.5%。表明MT利于提高植株的保水能力与抗氧化能力，ABA处理和MT+ABA处理提高了干旱胁迫下猕猴桃幼苗的光合作用，利于在水分限制下干物质的积累。 |
| 英文摘要: |
| To explore the mitigation effect and mechanism of exogenous melatonin (MT) and abscisic acid (ABA) on drought stress, ‘Jinshi No.1’ kiwifruit seedlings were used as materials, and the treatment of root irrigation with 100 μmol·L-1 MT solution, foliage spraying with 25 μmol·L-1 ABA solution, and their combination under drought conditions were designed. The results showed that MT treatment increased the relative water content, water potential, and antioxidant enzyme SOD activity in kiwifruit leaves by about 9%, 39%, and 134% and reduced the MDA and H2O2 content by about 66% and 7% in the leaves, when compared with those in the drought treatment group. Meanwhile, ABA treatment increased chlorophyll content, net photosynthetic rate, dry matter accumulation, osmotic adjustment substances and antioxidant enzyme POD activity by about 7%, 40%, 52% and 41% and reduced H2O2 content by about 13.5%, when compared to those in the drought treatment group. The effect of the combination treatment was similar to that of ABA treatment, as it increased the net photosynthetic rate, dry matter accumulation, and antioxidant enzyme POD activity by about 29%, 110% and 35.5%, and reduced MDA and H2O2 content by about 44% and 6.5%, when compared to those in the drought treatment group. These findings indicated that MT played a role in improving the water retention capacity and antioxidant capacity of plants. The ABA and the combination of MT and ABA treatments had beneficial effects on promoting photosynthesis and achieving optimal growth under water limitation. |
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