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Adaption to contrasting soil water conditions drives upland and lowland rice differentiation

Adaption to contrasting soil water conditions drives upland ...

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2013全国植物生物学大会

作者： XIA Hui ZHENG Xiaoguo CHEN Liang KOU Zhikui GAO Huan MA Xiaosong LONG Ping LI Jiajia LUO Lijun Shanghai Agrobiological Gene Center

Drought is one of the most harmful abiotic stresses to rice *** is very urgent for us to improve water-saving and drought-resistant characters in ***,the knowledge of evolution of drought-resistance in rice is *** this study,upland rice and lowland rice,two important rice ecotypes adapted to contrasting soil water conditions,were involved to investigated the evolution of drought-resistance during their *** outlier loci were detected between upland and lowland *** upland-lowland rice differentiation on these outlier loci were found in japonica(Fst=0.258) and indica(Fst= 0.127) *** selections on drought-resistant traits was revealed by higher Qst of drought-resistant traits than the neutral Fst between upland and lowland ***,the genetic distance matrix from outlier loci were significantly correlated with that from differentiated drought-resistant traits,suggesting that upland-lowland rice differentiation was driven by divergent selections on *** upland-and lowland-specific alleles responded differently between ecotypes or allelic types when encountering osmotic stress,showing signs of drought-resistance evolution at expression *** is noteworthy the drought resistance could be independently evolved in japonica and *** conclusion,genetic differentiation of upland and lowland rice was associated with divergent selections on drought-related *** findings could strengthen our understanding of the drought resistance evolution in rice with implications in rice drought-resistance improvement.

关键词： adaptive divergence drought stress rice ecotype drought-avoidance droughttolerance drought-responding EST-SSR

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