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首页> 外文期刊>Journal of Agricultural Science >Effects of in vitro Drought Stress on Growth, Proline Accumulation and Antioxidant Defense in Sugarcane
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Effects of in vitro Drought Stress on Growth, Proline Accumulation and Antioxidant Defense in Sugarcane

机译:体外干旱胁迫对甘蔗生长,脯氨酸积累和抗氧化防御的影响

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Drought is the most limiting environmental factor to crop productivity and presents a great variability in the degree of tolerance among and within species, among varieties. The aim of this study was to characterize sugarcane accessions regarding tolerance to water stress during in vitro cultivation based on changes in biometric, physiological and biochemical characteristics, within species and among species, to support future breeding programs. Adventitious shoots of five sugarcane accessions: Saccharum robustum, Saccharum spontaneum and Saccharum officinarum species, cultivated in Murashige and Skoog medium supplemented with 2% sucrose and 4 g/l Phytagel were used in five water potentials, 0, -0.3, -0.6, -0.9, -1.2 MPa, induced by mannitol. Survival, length of shoots and roots, number of shoots and roots, biomass, proline content in leaves and activity of antioxidant enzymes were analyzed. There is difference among species, and also, within the same sugarcane species when submitted to in vitro drought stress, and S. officinarum was shown to be the most tolerant. Proline can be used as a biochemical indicator of response to drought in sugarcane accessions and its accumulation was intensified in S. robustum and S. spontaneum accessions. Catalase activity remained unchanged with increased drought in sugarcane accessions evaluated.
机译:干旱是限制农作物生产力的最大环境因素,在品种之间和品种内部以及品种内部的耐受程度差异很大。这项研究的目的是基于种内和种间生物特征,生理和生化特性的变化,表征甘蔗种质在体外培养过程中对水分胁迫的耐受性,以支持未来的育种计划。在Murashige和Skoog培养基中添加了2%蔗糖和4 g / l Phytagel的五个甘蔗种的不定芽:鲁棒糖,自发糖和厚皮糖被用于五个水势中,分别为0,-0.3,-0.6,- 0.9,-1.2 MPa,由甘露醇诱导。分析了成活率,芽和根的长度,芽和根的数量,生物量,叶片中脯氨酸的含量以及抗氧化酶的活性。当经受体外干旱胁迫时,物种之间以及相同的甘蔗物种中也存在差异,并且显示出S.officinarum是最耐受的。脯氨酸可以用作甘蔗品种对干旱响应的生化指标,而鲁棒链霉菌和自发链霉菌种中脯氨酸的积累得到增强。在评估的甘蔗品种中,随着干旱增加,过氧化氢酶活性保持不变。

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