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首页> 外文期刊>African Journal of Biotechnology >Effect of salt stress on genetic diversity of Robinia pseudoacacia seedlings
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Effect of salt stress on genetic diversity of Robinia pseudoacacia seedlings

机译：盐胁迫对刺槐幼苗遗传多样性的影响

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摘要

Salt stress is an abiotic stress known to affect plant growth and distribution. In this investigation, this expectation was tested on germination, seedlings’ survival and genetic diversity of?Robinia pseudoacacia?(black locust). To do this, seeds of?R. pseudoacacia?collected from a natural population were sown on soil media of different salt concentrations (0.6, 1, 2, 3, 4, 5, 6, 7 and 8 g/kg), after which germination and seedlings survival rates were observed. Subsequently, genomic DNA was isolated from leaf samples for genetic analysis using 10 nuclear SSR primers. The results show that seed germination and seedling survival significantly reduced with increase in salt concentration. Specifically,?R. pseudoacacia?seedlings did not grow on soils with salt concentrations higher than 6 g/kg. As regards the effect of salt stress on genetic diversity of?R. pseudoacacia?seedlings, the overall result from 10 nuclear microsatellite primers revealed an increase in heterozygosity as salt concentration increased, which suggested selection against homozygosity under salt stress. This result further supports the fact that heterozygosity is one of the factors that ensures that tree populations are adaptable to salt stress. Therefore, management of forest tree populations should be geared towards managing genetic diversity in order to engender survival under salt stress.
机译：盐胁迫是一种已知会影响植物生长和分布的非生物胁迫。在这项调查中，该期望通过对刺槐（Robinia pseudoacacia）（黑刺槐）的发芽，幼苗存活和遗传多样性的检验。为此，R.R。的种子。在不同盐浓度（0.6、1、2、3、4、5、6、7和8 g / kg）的土壤介质上播种从自然种群中收集的拟金合欢种子，然后观察其发芽率和幼苗成活率。随后，从叶片样品中分离出基因组DNA，使用10条SSR核引物进行遗传分析。结果表明，随着盐浓度的升高，种子的萌发和幼苗的存活率显着降低。具体来说，在盐浓度高于6 g / kg的土壤上未种植拟阿拉伯树苗。关于盐胁迫对ΔR遗传多样性的影响。拟金合欢幼苗，从10个核微卫星引物的整体结果显示，随着盐浓度的增加，杂合度增加，这表明在盐胁迫下针对纯合子的选择。该结果进一步支持以下事实：杂合性是确保树木种群适应盐胁迫的因素之一。因此，林木种群的管理应着眼于遗传多样性的管理，以便在盐胁迫下生存。

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