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首页> 美国卫生研究院文献>PLoS Clinical Trials >QTL Analysis of Na+ and K+ Concentrations in Roots and Shoots under Different Levels of NaCl Stress in Rice (Oryza sativa L.)
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QTL Analysis of Na+ and K+ Concentrations in Roots and Shoots under Different Levels of NaCl Stress in Rice (Oryza sativa L.)

机译：不同NaCl胁迫水平下水稻根和茎中Na +和K +含量的QTL分析

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摘要

The key to plant survival under NaCl salt stress is maintaining a low Na+ level or Na+/K+ ratio in the cells. A population of recombinant inbred lines (RILs, F2∶9) derived from a cross between the salt-tolerant japonica rice variety Jiucaiqing and the salt-sensitive indica variety IR26, was used to determine Na+ and K+ concentrations in the roots and shoots under three different NaCl stress conditions (0, 100 and 120 mM NaCl). A total of nine additive QTLs were identified by QTL Cartographer program using single-environment phenotypic values, whereas eight additive QTLs were identified by QTL IciMapping program. Among these additive QTLs, five were identified by both programs. Epistatic QTLs and QTL-by-environment interactions were detected by QTLNetwork program in the joint analyses of multi-environment phenotypic values, and one additive QTL and nine epistatic QTLs were identified. There were three epistatic QTLs identified for Na+ in roots (RNC), three additive QTLs and two epistatic QTLs identified for Na+ in shoots (SNC), four additive QTLs identified for K+ in roots (RKC), four additive QTLs and three epistatic QTLs identified for K+ in shoots (SKC) and one additive QTL and one epistatic QTL for salt tolerance rating (STR). The phenotypic variation explained by each additive, epistatic QTL and QTL×environment interaction ranged from 8.5 to 18.9%, 0.5 to 5.3% and 0.7 to 7.5%, respectively. By comparing the chromosomal positions of these additive QTLs with those previously identified, five additive QTLs, qSNC9, qSKC1, qSKC9, qRKC4 and qSTR7, might represent novel salt tolerance loci. The identification of salt tolerance in selected RILs showed that a major QTL qSNC11 played a significant role in rice salt tolerance, and could be used to improve salt tolerance of commercial rice varieties with marker-assisted selection (MAS) approach.
机译：NaCl盐胁迫下植物存活的关键是维持细胞中Na + 的水平或Na + / K + 的比率低。用耐盐粳稻九才清和对盐敏感的variety稻IR26杂交后代得到的重组自交系（RILs，F2∶9）用于测定Na + 和K在三种不同的NaCl胁迫条件（0、100和120 mM NaCl）下，根和茎中的 + 浓度。通过QTL Cartographer程序使用单环境表型值识别出总共9个加性QTL，而通过QTL IciMapping程序识别了8个加性QTL。在这两个附加QTL中，两个程序都确定了五个。通过QTLNetwork程序在多环境表型值的联合分析中检测到上位QTL和逐个QTL相互作用，并鉴定了一个加性QTL和9个上位QTL。根（RNC）中鉴定出三个Na + 的上位QTL，芽中（SNC）鉴定了三个Na + 的上位QTL，鉴定了四个累加QTL根（RKC）中的K + 的数量，针对茎（SKC）中的K + 确定了四个加性QTL和三个上位性QTL，以及一个耐盐性的加性QTL和一个上位性QTL评级（STR）。由每种添加剂，上位QTL和QTLx环境相互作用解释的表型变异分别为8.5-18.9％，0.5-5.3％和0.7-7.5％。通过将这些附加QTL的染色体位置与先前确定的位置进行比较，qSNC9，qSKC1，qSKC9，qRKC4和qSTR7这5个附加QTL可能代表了新的耐盐基因座。在选定的RIL中对耐盐性的鉴定表明，主要的QTL qSNC11在水稻耐盐性中起着重要作用，可以通过标记辅助选择（MAS）方法用于提高商品水稻品种的耐盐性。

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