Mapping QTLs for kernel oil content in a tropical maize population

Maize cultivars often have low kernel oil content. To increase the oil content, efficient maize breeding programs have to be developed, which require the knowledge of the inheritance of this trait. Thus, the objective of this research was to map quantitative trait locus (QTLs) and estimate their eff...

Full description

Saved in:
Bibliographic Details
Published in:Euphytica 2004-05, Vol.137 (2), p.251-259
Main Authors: MANGOLIN, C. A, DE SOUZA, C. L, GARCIA, A. A. F, GARCIA, A. F, SIBOV, S. T, DE SOUZA, A. P
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Chromosomes
Corn
Cultivars
Fundamental and applied biological sciences. Psychology
Gene mapping
Genetic diversity
Genetics
Genetics and breeding of economic plants
Genomics
Plant breeding
Zea mays
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Maize cultivars often have low kernel oil content. To increase the oil content, efficient maize breeding programs have to be developed, which require the knowledge of the inheritance of this trait. Thus, the objective of this research was to map quantitative trait locus (QTLs) and estimate their effects for kernel oil content in a tropical maize population. Two maize inbred lines, contrasting for kernel oil content, were used to develop an F^sub 2^ population. Four hundred and eight F^sub 2^ plants were self-pollinated, and their kernels (F^sub 2:3^ progenies) were used for kernel oil evaluation. A genetic map with 75 microsatellites was developed, and the QTLs were mapped using the composite interval map (CIM); also, estimates of genetic and phenotypic variances, and heritability coefficient were computed. The map presented 10 linkage groups, spanned 1,438.6 cM in length with an average interval of 19.18 cM between adjacent markers. The kernel oil content averaged 58.40 g kg^sup -1^, and the broad-sense heritability was high (h^sup 2^= 0.98). Thirteen QTLs were mapped, which were distributed into eight chromosomes, and explained 26.64% of the genetic variation. QTLs in chromosomes 1, 5, and 6 contributed the most for kernel oil content. Nine out of 13 QTLs with favorable alleles were from the parental inbred with the highest kernel oil content. The average level of dominance was partial, but gene action of the QTLs ranged from additive to overdominance. Eight out of 13 mapped QTLs were already reported for temperate maize populations.[PUBLICATION ABSTRACT]
ISSN:0014-2336
1573-5060
DOI:10.1023/B:EUPH.0000041588.95689.47