Efficient cloning of genes for wheat yield component traits from QTLs via sequencing of the RIL population
Zhang, M.; Han, X.; Wang, H.; Sun, J.; Guo, B.; Gao, M.; Xu, H.; Zhang, G.; Li, H.; Cao, X.; Li, N.; Xu, Y.; Wu, Q.; Wang, C.; Zhang, G.; Yuan, Y.; Man, J.; Pu, Y.; Lv, G.; Qu, C.; Sun, J.; Cheng, X.; Dong, X.; Kong, F.; Zhao, Y.; An, Y.; Yuan, Y.; Guo, Y.; Li, S.
Show abstract
In wheat (Triticum aestivum L.), yield component traits (YCTs) are the most important yield traits. Only several genes for YCTs have been originally cloned. The efficient cloning of genes for YCTs directly from wheat remains a challenge. Here, we proposed a strategy for cloning genes from quantitative trait loci (QTLs) by sequencing of recombinant inbred lines (RILs) (QTL-Seq-RIL). Using the TN18 x LM6 RIL population as an example, we identified 138 candidate unigenes (CUGs) for YCTs from 77 stable QTLs. The average of CUGs per QTL was 1.8, which enabled us to confirm the CUGs directly. We have confirmed seven CUGs, TaIFABPL, TaDdRp, TaRLK, TaTD, TaTFC3, TaKMT and TaSPL17, via the CRISPR/Cas9 system. Of these, six genes were found firstly to regulate YCTs in crops except for TaSPL17. Five CUGs (include TaSPL17) for which orthologous genes have been cloned previously with the same or similar agronomic functions. It is to say, 11 CUGs were preliminarily validated using a single RIL population. QTL-Seq-RIL provides an efficient method for rapid gene cloning using existing RIL populations.
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