Earliness per se QTLs and their interaction with the photoperiod insensitive allele Ppd-D1a in the Cutler x AC Barrie spring wheat population
Earliness per se QTLs and their interaction with the photoperiod insensitive allele Ppd-D1a in the Cutler x AC Barrie spring wheat population
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DOI：
10.1007/s00122-013-2110-0
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发表时间：
2013-08-01
影响因子：
5.4
通讯作者：
Spaner, D.
中科院分区：
文献类型：
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作者：
Kamran, A.;Iqbal, M.;Spaner, D.
早熟本身调节开花时间独立于环境信号，并有助于微调开花和成熟的时间。在这项研究中，我们的目的是定位早熟本身的数量性状基因座（QTL）影响天开花和成熟的两个春小麦品种，卡特勒和AC巴里杂交发展的群体。对177个重组自交系（RILs）群体的21条染色体上共488个SSR和DArT多态性标记进行了基因分型。在单个环境和所有环境组合下，3个影响开花和成熟天数的早熟性QTL定位在1B染色体（QEps.dms-1B 1和QEps.dms-1B 2）和5 B染色体（QEps.dms-5 B1）上。在4A染色体上鉴定到影响开花时间的QTL（QFlt.dms-4A 1）。将两个籽粒产量QTL定位在第5 B染色体上，将一个QTL定位在第1D染色体上。该群体分离了光周期不敏感基因Ppd-D1 a，诱导提早开花0.69 d，提早成熟1.28 d。光周期不敏感等位基因Ppd-D1 a与开花期和成熟期QTL以加性方式互作。早熟性本身QTL QFlt.dms-5B.1可诱导小麦提早开花，有助于延长灌浆持续期，提高籽粒产量。因此，染色体5 B具有有希望的基因组区域，可以通过标记辅助选择在面包小麦中渗入以获得更高的籽粒产量和更早的成熟度。
Earliness per se regulates flowering time independent of environmental signals and helps to fine tune the time of flowering and maturity. In this study, we aimed to map earliness per se quantitative trait loci (QTLs) affecting days to flowering and maturity in a population developed by crossing two spring wheat cultivars, Cutler and AC Barrie. The population of 177 recombinant inbred lines (RILs) was genotyped for a total of 488 SSR and DArT polymorphic markers on all 21 chromosomes. Three QTLs of earliness per se affecting days to flowering and maturity were mapped on chromosomes 1B (QEps.dms-1B1 and QEps.dms-1B2) and 5B (QEps.dms-5B1), in individual environments and when all the environments were combined. A QTL affecting flowering time (QFlt.dms-4A1) was identified on chromosome 4A. Two grain yield QTLs were mapped on chromosome 5B, while one QTL was mapped on chromosome 1D. The population segregated for the photoperiod insensitive gene, Ppd-D1a, and it induced earlier flowering by 0.69 days and maturity by 1.28 days. The photoperiod insensitive allele Ppd-D1a interacted in an additive fashion with QTLs for flowering and maturity times. The earliness per se QTL QFlt.dms-5B.1 inducing earlier flowering could help to elongate grain filling duration for higher grain yield. Hence, chromosome 5B possesses promising genomic regions that may be introgressed for higher grain yield with earlier maturity through marker-assisted selection in bread wheat.