A novel allele of TaGW2-A1 is located in a finely mapped QTL that increases grain weight but decreases grain number in wheat (Triticum aestivum L.)

• DOI: 10.1007/s00122-017-3017-y
• Publication Date: 2017-11-17T15:49:32Z
• Authors: Huijie Zhai; Zhiyu Feng; Xiaofen Du; Yane Song; Xinye Liu; Zhongqi Qi; Long Song; Jiang Li; Linghong Li; Huiru Peng; Zhaorong Hu; Yingyin Yao; Mingming Xin; Shihe Xiao; Qixin Sun; Zhongfu Ni
• Keywords: Inbred strain

A novel TaGW2-A1 allele was identified from a stable, robust QTL region, which is pleiotropic for thousand grain weight, number per spike, and morphometric parameters in wheat. Thousand weight (TGW) spike (GNS) are two crucial determinants of wheat yield, genetic dissection their relationships can help to fine-tune these components maximize yield. By evaluating 191 recombinant inbred lines 11 field trials, we five genomic regions on chromosomes 1B, 3A, 3B, 5B, or 7A that solely influenced either TGW GNS, further region chromosome 6A concurrently affected GNS. The interest 6A, flanked by wsnp_BE490604A_Ta_2_1 wsnp_RFL_Contig1340_448996 designated as QTgw/Gns.cau-6A, finely mapped interval shorter than 0.538 cM using near isogenic (NILs). elite NILs QTgw/Gns.cau-6A increased 8.33%, but decreased GNS 3.05% six trials. Grain Weight 2 (TaGW2-A1), well-characterized gene negatively regulates width wheat, located within the QTgw/Gns.cau-6A. rare with 114-bp deletion 5' flanking parent higher TGW, it reduced promoter activity expression. In conclusion, results expand our knowledge molecular basis TGW-GNS trade-offs QTLs likely useful development cultivars and/or