Genetic effects and genetic relationships among <Emphasis Type="Italic">shrunken</Emphasis> (<Emphasis Type="Italic">sh2</Emphasis>) sweet corn lines and F1 hybrids |
| |
Authors: | K F Solomon I Martin A Zeppa |
| |
Institution: | (1) Department of Employment, Economic Development and Innovation (DEEDI), Hermitage Research Facility, 604 Yangan Rd, QLD, Australia;(2) Department of Employment, Economic Development and Innovation (DEEDI), Kairi Research Facility, Kairi, QLD, Australia |
| |
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 sh2 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|