Cold tolerance at the early growth stage in wild and cultivated rice
Cold tolerance at the early growth stage in wild and cultivated rice
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DOI：
10.1007/s10681-008-9753-y
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发表时间：
2009-02-01
期刊：
影响因子：
1.9
通讯作者：
Sano, Yoshio
中科院分区：
文献类型：
--
作者：
Baruah, Akhil Ranjan;Ishigo-Oka, Noriko;Sano, Yoshio
本研究旨在了解亚洲水稻生育前期耐冷性的变异规律及其遗传基础。以栽培稻（Oryza sativa ssp.籼型和亚种japonica）及其野生祖先（普通野生稻）。不同类群间的抗寒性存在显著差异。在种子萌发期，籼稻和粳稻的耐盐性均高于稻; rufipogon，而在胚芽和幼苗阶段，ssp.粳稻的耐盐性比SSP强。 indica)和粳亚种(O.野甘草属在胚芽期的耐冷性方面，在0. 05~0. 05之间存在着随纬度的变化趋势。rufipogon属和sp. japonica，表明目前的变异格局似乎是由它们的系统发育史和对当地环境的持续适应所决定的。对O.紫花苜蓿属japonica（耐盐）和O. rufipogon（敏感）在胚芽和幼苗期有5个推测的耐冷性QTL，但在萌发期没有发现。同时，利用代换作图法对影响胚芽期耐冷性的2个主效QTL进行了精确定位，为进一步提高大豆的耐冷性提供了理论依据。印度
The present study was conducted to understand the pattern of variation and the genetic bases for cold tolerance at the early growth stage in Asian rice. The genetic variation was investigated at the germination, plumule and seedling stages among 57 strains including cultivated rice (Oryza sativa ssp. indica and ssp. japonica) and its wild progenitor (Oryza rufipogon). The significant differentiation of cold tolerance was observed among the taxonomically divided groups. At the germination stage, both indica and japonica subspecies tended to be more tolerant than O. rufipogon, whereas at the plumule and seedling stages, ssp. japonica tended to be more tolerant than ssp. indica and O. rufipogon. Furthermore, in cold tolerance at the plumule stage, the clinal variation across the latitude of origins was observed within O. rufipogon and ssp. japonica, suggesting that the current pattern of variation seems to have been shaped by both their phylogenetic histories and on-going adaptation to the local environments. QTL analysis between O. sativa ssp. japonica (tolerant) and O. rufipogon (susceptible) revealed five putative QTLs for cold tolerance at the plumule and seedling stages but not at the germination stage. Substitution mapping was also carried out to precisely locate the two major QTLs for cold tolerance at the plumule stage, which could be used for improvement of tolerance to cold stress in ssp. indica.