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QTL mapping and genetic analysis for maize kernel size and weight in multi-environments

Author:
Lan, Tianru, He, Kunhui, Chang, Liguo, Cui, Tingting, Zhao, ZhiXin, Xue, Jiquan, Liu, Jianchao
Source:
Euphytica 2018 v.214 no.7 pp. 119
ISSN:
0014-2336
Subject:
Zea mays, agronomic traits, chromosome mapping, chromosomes, corn, genetic analysis, grain yield, inbred lines, marker-assisted selection, phenotypic variation, prediction, quantitative trait loci, seed size, seeds
Abstract:
Kernel size and weight are important agronomic traits, as well as crucial traits that influence grain yield in maize. In the present study, 150 F₇ recombinant inbred lines derived from a cross 178×K12 were evaluated for kernel length (KL), kernel width (KW), kernel thickness (KT), and 100-kernel weight (HKW) across seven environments. Natural variations in KL, KW, KT, and HKW were observed in the population. A set of quantitative trait loci (QTLs) for the kernel-related traits were identified by inclusive composite interval mapping method. For the four kernel traits from seven environments and the best linear unbiased prediction data, a total of 52 QTLs were detected, which distributed on all chromosomes except chromosome 6. The LOD values ranged from 2.52 to 8.91, the additive effect from − 2.22 to 1.37, and the range of individually explaining phenotypic variation was from 5.8 to 23.49%. Amongst these QTLs, most were detected only in one or two environments. Three stable QTLs, qKL4-1 at bin 4.07/4.08, qKW4-2 at bin 4.06 and qKT2-1 at bin 2.02/2.03, were identified across at least three environments. Besides, several overlapping QTLs associated with multiple traits were identified. For example, qKW3-1 for KW and qHKW3-1 for HKW were located in the same marker interval at Bin 3.01/3.02. These stable QTLs and overlapping QTLs found in this study will contribute to the understanding of genetic components of grain yield and provide the foundation for molecular marker-assisted breeding in maize.
Agid:
5978146