Genetic combining ability for concentration of mineral
elements in cabbage head (Brassica oleracea var.
capitata L.)
B K Singh, S R Sharma,
and B Singh
Euphytica
184: 265-273, 2012
E-mail:
bksinghkushinagar@yahoo.co.in
Abstract
Brassica vegetables are important source of
dietary nutrition. However, information on the genetic combining ability of
mineral elements such as iron, zinc, copper, manganese, potassium and calcium
or their types of genetic effects (i.e. additive or non-additive) is scarce but
important as it influences the selection of parents and breeding approaches to
be adopted for improvement of nutritional quality of cabbage. Therefore,
an attempt was made to estimate combining ability in a line × tester (5 × 11)
mating design for minerals. Significant mean square for line × tester
interaction was observed for all minerals under study indicating the prevalence
of non-additive variance; while less
than unity value of σ2gca /σ2sca
ratio for iron, zinc, manganese,
potassium and calcium accumulation indicate predominance of non-additive
gene action. The parents 83-2,
Pride of Asia, Pusa Mukta, Red Cabbage and MR-1 were found good general
combiners for four mineral elements. The general combining ability effects of
the parents for various minerals revealed that none of the parents excelled for
all the minerals suggesting the need for multiple crossing approaches. The
cross 83-1 × AC-1019 (Poor × Poor general combiner) exhibits desirable
significant specific combining ability effects for all six minerals might be
due to presence of high magnitude of non-additive especially complementary
epistatic effects which can be utilize for commercial exploitation of
heterosis. This study shows clearly that specific combining ability is more
important than general combining ability for predicting hybrid combinations for
high mineral content in cabbage head.
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