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Genetic effects and genetic relationships among shrunken (sh2) sweet corn lines and F1 hybrids

Solomon, K.F. and Martin, I. and Zeppa, A. (2012) Genetic effects and genetic relationships among shrunken (sh2) sweet corn lines and F1 hybrids. Euphytica, 185 (3). pp. 385-394.

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Article Link(s): http://dx.doi.org/10.1007/s10681-011-0555-2

Publisher URL: http://www.springeronline.com

Abstract

The objectives of this study were to quantify the components of genetic variance and the genetic effects, and to examine the genetic relationship of inbred lines extracted from various shrunken2(sh2) breeding populations. Ten diverse inbred lines developed from genetic background, were crossed in half diallel. Parents and their F1 hybrids were evaluated at three environments. The parents were genotyped using 20 polymorphic simple sequence repeats (SSR). Agronomic and quality traits were analysed by a mixed linear model according to additive-dominance genetic model. Genetic effects were estimated using an adjusted unbiased prediction method. Additive variance was more important than dominance variance in the expression of traits related to ear aspects (husk ratio and percentage of ear filled) and eating quality (flavour and total soluble solids). For agronomic traits, however, dominance variance was more important than additive variance. The additive genetic correlation between flavour and tenderness was strong (r = 0.84, P <0.01). Flavour, tenderness and kernel colour additive genetic effects were not correlated with yield related traits. Genetic distance (GD), estimated from SSR profiles on the basis of Jaccard's similarity coefficient varied from 0.10 to 0.77 with an average of 0.56. Cluster analysis classified parents according to their pedigree relationships. In most studied traits, F1 performance was not associated with GD.

Item Type:Article
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Springer Science+Business Media B.V. 2011.
Keywords:Correlation; diallel; genetic distance; SSR; sweet corn; variance; inbred lines; combining ability; maize population; yield components; diallel analysis; tropical maize; diversity; performance; markers; heterosis.
Subjects:Plant culture > Field crops > Corn. Maize
Science > Botany > Genetics
Deposited On:24 Jul 2012 06:12
Last Modified:24 Jul 2012 06:12

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