|ECHEVERRY-SOLARTE, MORGAN - North Dakota State University|
|KUMAR, AJAY - North Dakota State University|
|MANTOVANI, EDER - North Dakota State University|
|SIMSEK, SENAY - North Dakota State University|
|MERGOUM, MOHAMED - North Dakota State University|
|ALAMARI, MOHAMMED - King Saud University|
Submitted to: The Plant Genome
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/18/2014
Publication Date: 8/18/2014
Citation: Echeverry-Solarte, M., Kumar, A., Kianian, S., Mantovani, E.E., Simsek, S., Mergoum, M., Alamari, M.S. 2014. Genome-wide genetic dissection of supernumerary spikelet and related traits in common wheat (Triticum aestivum L.). The Plant Genome. Available: https://dl.sciencesocieties.org/files/publications/tpg/first-look/tpg-2014-03-0013.pdf.
Interpretive Summary: In order to improve cultivate wheat, exotic germplasm are looked at for traits of importance. In this study an exotic line carrying genes for increased number of florets and seeds was analyzed. This study identifed a number of genes related to heading date, maturity, grain yield, kernels per spike, and supernumerary spikelets. A number of regions across the genome were identified that influence multiple traits simultaneously. Stable genes that contribute significantly to important agronomic traits as related to grain number and yield identified in the present study may be useful in marker assisted breeding programs to transfer the desirable alleles into elite wheat germplasm.
Technical Abstract: In wheat (Triticum aestivum L), exotic genotypes express a broad range of spike-related traits and could be used as a source of new genes to enrich the germplasm for wheat breeding programs. In the present study, a population of 163 recombinant inbred lines derived from a cross between an elite line (WCB414) and an exotic line with branched spike or supernumerary spikelet (SS) (WCB617) was evaluated over four to six environments to identify QTL associated with nine spike-related, and ten agronomic traits. Composite interval mapping identified a total of 143 QTL located on 17 different wheat chromosomes and included 35 stable QTL. The phenotype variation explained (PVE) by individual QTL ranged from 0.61% to 91.8%. One major QTL for glume pubescences was located in QTL rich region on 1AS, where also were identified loci for other traits such as kernels per spike and spike length. Likewise, a cluster of QTL associated with yield-related, agronomic and spike-related traits and contributing up to 40.3% of PVE was found on 2DS in the vicinity of a major QTL for SS traits. Stable and major QTL identified in the present study may be useful in marker assisted breeding programs to transfer the desirable alleles into other germplasm. Desirable QTL alleles were also contributed by the exotic line, suggesting the possibility of enriching the breeding germplasm with alleles from SS genotypes.