In:
Australian Journal of Agricultural Research, CSIRO Publishing, Vol. 48, No. 5 ( 1997), p. 605-
Abstract:
Grain yield and protein concentration are two of the more important criteria
for wheat breeding in Queensland. Three aspects of the inheritance of both of these traits can have an impact on achieving genetic progress:
(i) the magnitude and form of the genetic correlation between the traits, (ii) the magnitude of genetic
variation and genotype × environment interactions, and (iii) the importance of epistasis in genetic variation.
These 3 factors were examined for 2 crosses in a multi- environment trial conducted in Queensland in 1989. Negative genetic correlations were found
between grain yield and protein concentration in both crosses. Genetic variation and genotype × environment interactions were found to be
important for both traits. There was little evidence for the existence of significant additive × additive epistasis for either trait and the
genotype × environment interactions were predominantly additive × environment in nature. From both crosses, progeny combining the high yield and
high protein levels of the parents were identified. This suggests that there was a degree of independent segregation of the genes controlling grain yield
and protein concentration in both crosses. Therefore, simultaneous genetic progress for yield and protein concentration is possible in Queensland
environments.
Type of Medium:
Online Resource
ISSN:
0004-9409
Language:
English
Publisher:
CSIRO Publishing
Publication Date:
1997
SSG:
21
