GENETICS OF RESISTANCE TO RENIFORM NAMATODE (Rotylenchulus reniformis), YIELD AND YIELD COMPONENTS IN CASTOR (Ricinug Communis L.)
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Date
1996
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Publisher
AAU, Anand
Abstract
heterobeltiosis and 208.76 g seed yield/plant. Additive and
non-additive gene effects largely involved in the expression
of seed yield and its component characters suggested the
feasibility of the exploitation of hybrid vigour on
commercial scale or alternatively to follow cyclic method of
breeding involving selection of superior recombinants and
their inter se crossing for evolving desirable genotypes of
castor.
In general, the crosses showing significant
heterosis and heterobeltiosis also exhibited significant
inbreeding depression.
Low magnitude of narrow sense heritability
observed for resistance to reniform nematode, seed yield and
yield components in almost all crosses studied revealed the
importance of non-additive gene action in the expression of
these traits. Moderate to high heritability coupled with
moderate genetic advance as per cent of mean for seed yield
and its components in various crosses suggested that seed
yield and its components can be improved upon by following
selection in succeeding generations. Low narrow sense
heritability coupled with low genetic advance observed for
oil content suggested slow improvement in this quality trait
through selection.
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Keywords
AGRICULTURE, PLANT BREEDING AND GENETICS, STUDY