Unravelling the complex trait of harvest index in rapeseed Brassica napus L. with association mappingReportar como inadecuado




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BMC Genomics

, 16:379

First Online: 12 May 2015Received: 18 December 2014Accepted: 01 May 2015DOI: 10.1186-s12864-015-1607-0

Cite this article as: Luo, X., Ma, C., Yue, Y. et al. BMC Genomics 2015 16: 379. doi:10.1186-s12864-015-1607-0

Abstract

BackgroundHarvest index HI, the ratio of grain yield to total biomass, is considered as a measure of biological success in partitioning assimilated photosynthate to the harvestable product. While crop production can be dramatically improved by increasing HI, the underlying molecular genetic mechanism of HI in rapeseed remains to be shown.

ResultsIn this study, we examined the genetic architecture of HI using 35,791 high-throughput single nucleotide polymorphisms SNPs genotyped by the Illumina BrassicaSNP60 Bead Chip in an association panel with 155 accessions. Five traits including plant height PH, branch number BN, biomass yield per plant BY, harvest index HI and seed yield per plant SY, were phenotyped in four environments. HI was found to be strongly positively correlated with SY, but negatively or not strongly correlated with PH. Model comparisons revealed that the A–D test ADGWAS model could perfectly balance false positives and statistical power for HI and associated traits. A total of nine SNPs on the C genome were identified to be significantly associated with HI, and five of them were identified to be simultaneously associated with HI and SY. These nine SNPs explained 3.42 % of the phenotypic variance in HI.

ConclusionsOur results showed that HI is a complex polygenic phenomenon that is strongly influenced by both environmental and genotype factors. The implications of these results are that HI can be increased by decreasing PH or reducing inefficient transport from pods to seeds in rapeseed. The results from this association mapping study can contribute to a better understanding of natural variations of HI, and facilitate marker-based breeding for HI.

KeywordsHarvest index Complex traits Brassica napus Association mapping Correlation Electronic supplementary materialThe online version of this article doi:10.1186-s12864-015-1607-0 contains supplementary material, which is available to authorized users.

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Autor: Xiang Luo - Chaozhi Ma - Yao Yue - Kaining Hu - Yaya Li - Zhiqiang Duan - Ming Wu - Jinxing Tu - Jinxiong Shen - Bin Yi

Fuente: https://link.springer.com/







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