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首页> 外文期刊>Genome >Identification of salt-tolerant QTLs with strong genetic background effect using two sets of reciprocal introgression lines in rice
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Identification of salt-tolerant QTLs with strong genetic background effect using two sets of reciprocal introgression lines in rice

机译：利用两组互渗基因在水稻中鉴定具有强遗传背景作用的耐盐QTL

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摘要

Effect of genetic background on detection of quantitative trait locus (QTL) governing salinity tolerance (ST) was studied using two sets of reciprocal introgression lines (ILs) derived from a cross between a moderately salinity tolerant japonica variety, Xiushui09 from China, and a drought tolerant but salinity susceptible indica breeding line, IR2061-520-6-9 from the Philippines. Salt toxicity symptoms (SST) on leaves, days to seedling survival (DSS), and sodium and potassium uptake by shoots were measured under salinity stress of 140 mmol/L of NaCI. A total of 47 QTLs, including 26 main-effect QTLs (M-QTLs) and 21 epistatic QTLs (E-QTLs), were identified from the two sets of reciprocal ILs. Among the 26 MQTLs, only four (15.4%) were shared in the reciprocal backgrounds while no shared E-QTLs were detected, indicating that ST QTLs, especially E-QTLs, were very specific to the genetic background. Further, 78.6% of the M-QTLs for SST and DSS identified in the reciprocal ILs were also detected in the recombinant inbred lines (RILs) from the same cross, which clearly brings out the background effect on ST QTL detection and its utilization in ST breeding. The detection of ILs with various levels of pyramiding of nonallelic M-QTL alleles for ST from Xiushui09 into IR2061-520-6-9 allowed us to further improve the ST in rice.
机译：研究了遗传背景对控制耐盐性（ST）的数量性状基因座（QTL）的影响，使用了来自中等耐盐性粳稻品种秀水09与干旱的杂交后代的两对互渗系（ILs）耐受性但对盐分敏感的in稻育种系IR2061-520-6-9，来自菲律宾。在盐浓度为140 mmol / L NaCl的条件下，测量了叶片的盐毒症状（SST），幼苗存活天数（DSS）和枝条摄取的钠和钾。从两组相互的IL中共鉴定出47个QTL，包括26个主要效应QTL（M-QTL）和21个上位QTL（E-QTL）。在这26个MQTL中，只有四个（15.4％）在相互的背景中共享，而没有检测到共享的E-QTL，这表明ST QTL，尤其是E-QTL对遗传背景非常特定。此外，在同一交配的重组自交系（RIL）中也检测到了倒数IL中鉴定出的SST和DSS的M-QTL的78.6％，这清楚地显示了对ST QTL检测及其在ST中的利用的背景效应。配种。从秀水09到IR2061-520-6-9的ST等位基因的非等位基因M-QTL等位基因具有多种金字塔连接的ILs的检测使我们能够进一步提高水稻中的ST。

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