B.
K. Singh, S. R. Sharma and B. Singh
Euphytica 184 (2): 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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