Dissection of Two Quantitative Trait Loci with Pleiotropic Effects on Plant Height and Spike Length Linked in Coupling Phase on the Short Arm of Chromosome 2D of Common Wheat (Triticum Aestivum L.)

Overview

Journal Theor Appl Genet

Publisher Springer

Specialty Genetics

Date 2018 Sep 30

PMID 30267114

Citations 20

Authors

Lingling Chai

Zhaoyan Chen

Ruolin Bian

Huijie Zhai

Xuejiao Cheng

Huiru Peng

Yingyin Yao

Zhaorong Hu

Mingming Xin

Weilong Guo

Qixin Sun

Aiju Zhao

Zhongfu Ni

Affiliations

Soon will be listed here.

Abstract

Two QTL with pleiotropic effects on plant height and spike length linked in coupling phase on chromosome 2DS were dissected, and diagnostic marker for each QTL was developed. Plant height (PHT) is a crucial trait related to plant architecture and yield potential, and dissection of its underlying genetic basis would help to improve the efficiency of designed breeding in wheat. Here, two quantitative trait loci (QTL) linked in coupling phase on the short arm of chromosome 2D with pleiotropic effects on PHT and spike length, QPht/Sl.cau-2D.1 and QPht/Sl.cau-2D.2, were separated and characterized. QPht/Sl.cau-2D.1 is a novel QTL located between SNP makers BS00022234_51 and BobWhite_rep_c63957_1472. QPht/Sl.cau-2D.2 is mapped between two SSR markers, SSR-2062 and Xgwm484, which are located on the same genomic interval as Rht8. Moreover, the diagnostic marker tightly linked with each QTL was developed for the haplotype analysis using diverse panels of wheat accessions. The frequency of the height-reduced allele of QPht/Sl.cau-2D.1 is much lower than that of QPht/Sl.cau-2D.2, suggesting that this novel QTL may be an attractive target for genetic improvement. Consistent with a previous study of Rht8, a significant difference in cell length was observed between the NILs of QPht/Sl.cau-2D.2. By contrast, there was no difference in cell length between NILs of QPht/Sl.cau-2D.1, indicating that the underlying molecular mechanism for these two QTL may be different. Collectively, these data provide a new example of QTL dissection, and the developed diagnostic markers will be useful in marker-assisted pyramiding of QPht/Sl.cau-2D.1 and/or QPht/Sl.cau-2D.2 with the other genes in wheat breeding.

Citing Articles

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QTL analysis in the Mianmai 902×Taichang 29 RIL population reveals the genetic basis for the high-yield of wheat cultivars Mianmai 902 in terms of spike and plant architecture.

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