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首页> 外文期刊>Cereal Research Communications >Marker-assisted identification of novel genetic lines for salinity tolerance and their categorization for utilization in development of hybrid rice (Oryza sativa L.)
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Marker-assisted identification of novel genetic lines for salinity tolerance and their categorization for utilization in development of hybrid rice (Oryza sativa L.)

机译：用于盐度耐受性的新型遗传系的标记辅助鉴定及其在杂交水稻杂交水稻开发中的分类（Oryza Sativa L.）

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摘要

Identification of new sources of salinity-tolerant genotypes is prerequisite for rice breeding programs in different saline ecosystems. In the present experiment, we characterized 177 landraces from the Western Ghats of Karnataka under natural saline field conditions for two years using morpho-physiological and grain quality parameters. Significant variation was present among landraces for seedling stage and reproductive stage salinity tolerance. The nutrient composition analysis of grain revealed an increase in average grain protein and carbohydrate content under saline conditions. Evaluation of twenty-two SSR markers associated with the Saltol region validated RM140, RM287 and RM3412 as best markers to classify landraces for saline tolerance. Polymorphism Information Content and genetic diversity indices showed that the markers RM10748 and RM10864 were highly useful for distinguishing landraces. Further, to benefit the exploitation of heterosis, eleven maintainers were identified among tolerant landraces and these genotypes could be further developed into male sterile lines for production of salinity-tolerant rice hybrids. Comparison with 'Pokkali' for morpho-physiological traits along with molecular confirmation showed that the landraces 'Doddabaikalu,' Kalaadikonda,' Gajagunda' and 'Anekombina batha' were superior donors carrying genomic regions for salinity tolerance.
机译：鉴定耐盐基因型的新来源是在不同盐碱生态系统中进行水稻育种的先决条件。在本实验中，我们使用形态生理学和谷物质量参数，在天然盐田条件下，对卡纳塔克邦西部高止山脉的177个地方品种进行了两年的特征化研究。地方品种苗期和生殖期耐盐性存在显著差异。谷物的营养成分分析显示，在盐碱条件下，平均谷物蛋白质和碳水化合物含量增加。对与Saltol区域相关的22个SSR标记的评估证实RM140、RM287和RM3412是耐盐性地方品种分类的最佳标记。多态性信息含量和遗传多样性指数表明，标记RM10748和RM10864对于区分地方品种非常有用。此外，为了有利于杂种优势的利用，在耐盐地方品种中鉴定了11个保持系，这些基因型可以进一步发展成雄性不育系，用于生产耐盐水稻杂交种。与“Pokkali”的形态生理特征比较以及分子确认表明，地方品种“Doddabaikalu”、“Kalaadikonda”、“Gajagunda”和“Anekombina batha”是携带耐盐基因组区域的优良供体。

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