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GENETICS OF YIELD AND ITS ATTRIBUTES IN MUNG BEAN [Vigna radiata (L.) Wilczek]

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Title GENETICS OF YIELD AND ITS ATTRIBUTES IN MUNG BEAN [Vigna radiata (L.) Wilczek]
 
Creator PARMAR, V.L.
 
Contributor VASHI, P.S.
 
Subject planting, genes, seasons, summer, additives, crossing over, biological phenomena, yields, genetics, heterosis
 
Description Six generation i. e. P1, P2, F1, F2, BC1 and BC2 of nine crosses
viz., Co-4 x K-851, Co-4 x Pusa bold-1, Co-4 x Pusa 9632, VRMGg-1 x K-
851, VRMGg-1 x Pusa bold-1, VRMGg-1 x Pusa 9632, GM-4 x K-851, GM-
4 x Pusa bold-1 and GM-4 x Pusa 9632 of mung bean (Vigna radiata (L.)
Wilczek) were grown in two seasons viz., summer and kharif 2003 at
college farm, N. M. College of Agriculture, Navsari in randomized block
design replicated thrice, with a view to study the extent of heterosis,
inbreeding depression, heritability, genetic advance and nature of gene
action governing grain yield and its attributes.
The analysis of variance revealed significant differences
among various generations for majority of the characters in all the
crosses indicating presence of appreciable amount of variability in the
materials tested. Inadequacy of additive-dominance model was evident
by the significance of scaling tests A, B, C and D as given by Mather
(1949) indicating presence of non-allelic gene action in most of the
crosses for various traits studied.
Crosses VRMGg-1 x Pusa 9632, GM-4 x K-851 and VRMGg-1
x K-851 recorded significant positive heterosis over better parent for
grain yield per plant and its related components. The per se
performance of these crosses was also higher for the respective traits in
summer season. Similarly, during kharif crosses Co-4 x Pusa bold-1, Co-4
x Pusa 9632 and VRMGg-1 x K-851 depicted high per se performance for
grain yield and majority of its components with significant high positive
heterobeltiosis. Crosses showing high heterotic effects for grain yield
and its components also manifested significant inbreeding depression
which indicated involvement of dominance gene effects in the
expression of the various traits.
The results revealed that both additive and dominance gene
effects were significant for majority of the traits in all the nine crosses
studied, however the magnitude of dominance gene effects was much
higher than the additive effects in all the crosses for majority of the
traits which indicated pre-dominant role of dominance gene effects in
the inheritance of grain yield and its related traits.
Among epistasis gene effects dominance x dominance
played important role in the expression of grain yield and its related
traits like pods per plant, pod length, 100-seed weight and harvest index
in majority of the crosses while additive x dominance showed major
contribution in the expression of branches per plant. For clusters per
plant and days to 50 per cent flowering, additive x additive played predominant
role in majority of crosses. Magnitude of non-fixable
component was high for grain yield and some of its components. Diallel
selective mating or biparental mating in early segregating generations
might prove to be effective approach in further enhancing the grain
yield. In some of the crosses fixable components were significant,
positive and of considerable magnitude for yield components like
clusters per plant, pods per plant, pods per cluster and 100-seed weight.
Directional selection would be beneficial in isolating more efficient
segregants in these crosses for important yield attributes which
ultimately helps in further elevating the yield potential.
 
Date 2016-03-01T15:44:38Z
2016-03-01T15:44:38Z
2005-10
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64562
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari