Relationship between heterosis and genetic divergence for phosphorus use efficiency and its components in tropical maize

Ciência Rural

Débora Santos Caixeta²  Roberto Fritsche-neto¹  Lorena Guimarães Batista²  Humberto Fanelli Carvalho²  Júlio César Dovale²  Éder Cristian Malta De Lanes²  Glauco Vieira Miranda¹ 

[1] ,Universidade Federal de Viçosa (UFV)Viçosa MG ,Brasil

关键词: dissimilarity;    abiotic stress;    molecular markers;    combining ability;    dissimilaridade;    estresse abiótico;    marcadores moleculares;    capacidade de combinação;   

DOI  :  10.1590/S0103-84782012005000133

来源: SciELO

【 摘 要 】

The objective of this study was to determine the relationship between heterosis and genetic divergence for phosphorus use efficiency (PUE) in tropical maize. It was used two groups of genitors, each consisting of seven lines, contrasting with each other in the nitrogen and phosphorus use efficiency. It was obtained 41 hybrid combinations between these groups, which were evaluated in low phosphorus. Randomized complete block design with two replications was used. For obtaining the components of variance and the breeding values were used REML/BLUP method. In the genotyping of the parental lines were used 80 microsatellite markers. Through the correlation between genetic distance obtained by the markers and specific combining ability it was not possible to determine with accuracy by molecular markers, the crosses that produced hybrids with the highest heterosis for PUE. Thus, is possible to conclude that there is no relationship between genetic divergence and heterosis for phosphorus use efficiency and its components in tropical maize.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License