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GENETIC DIVERGENCE IN PIGEONPEA [Cajanus cajan (L.) Millsp.]

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Title GENETIC DIVERGENCE IN PIGEONPEA [Cajanus cajan (L.) Millsp.]
 
Creator RENTAPALLI SURESH
 
Contributor GOVINDA RAO, B
 
Subject GENETIC, DIVERGENCE,PIGEONPEA
 
Description An investigation on genetic divergence in pigeonpea [Cajanus cajan (L.)
Millsp.] was carried out during kharif 2010-11 at Regional Agricultural Research
Station, Lam, Guntur with 41 genotypes to elicit the information on nature and extent
of the genetic variability, heritability, genetic advance, character association, path
analysis and genetic divergence. Observations were recorded on thirteen characters
viz., plant height (cm), days to 50% flowering, days to maturity, number of primary
branches per plant, number of secondary branches per plant, number of pods per
plant, pod length (cm), number of seeds per pod, shelling percentage, 100 seed
weight (g), seed yield per plant (g), grain protein content (%) and harvest index.
The genotypic coefficients of variation for all the characters studied were
lesser than the phenotypic coefficients of variation indicating the effect of the
environment. High genetic variability coupled with high heritability and genetic
advance as per cent of mean was observed for number of primary branches per plant,
number of secondary branches per plant, number of pods per plant, seed yield per
plant and grain protein content indicating the role of additive genes in governing the
inheritance of these traits.
The correlation study indicated that the plant height, number of secondary
branches per plant, numbers of pods per plant, number of seeds per pod and harvest
index had significant positive association with seed yield and simultaneous
improvement of these characters along with seed yield is possible.
Path coefficient analysis revealed that harvest index, number of primary
branches per plant and 100 seed weight had positive direct effects on seed yield per
plant.
The results of multivariate analysis revealed the presence of considerable
genetic divergence among the 41 genotypes studied and grouped into six clusters as
per D2 analysis and seven clusters in case of cluster analysis. The grouping of
genotypes into clusters was at random indicating that geographical isolation might
not be the only factor causing genetic diversity. Out of 13 characters studied, number
of pods per plant contributed maximum towards divergence followed by grain
protein content, plant height, days to 50% flowering, seed yield per plant and number
of primary branches per plant.
Based on the inter-cluster distances among the groups, suggestions were
made to attempt crosses between clusters IV (JKM144, PERENNIAL 1,
MAHANANDI 2, LOCAL 2003-1, LOCAL 2002-3, LRG 30, JSA72-3, SM 1, WRG
53, GM 1, WRG 150, SM 30, TT 02 and BSMR 737) and VI (SM 13 and WRG 47)
which had maximum inter cluster distance to obtain better heterotic and desirable
segregants. Principal component analysis identified five principal components (PCs)
which explained 83.54% of the variability.
Agglomerative cluster analysis revealed that crosses can be attempted
between clusters III (JKM 144, PERENNIAL 1 and MAHANANDI 2) and cluster
VII (SM 13 and WRG 47) which had wide genetic distance to obtain maximum
heterosis.
The genotypes SM 13, SM 114, PERENNIAL 1 and TT 02 showed
maximum inter-cluster distance and wide genetic distance with each other in all the
three divergence methods. So they can be exploited in hybridization programme for
identification of desirable segregants.
 
Date 2016-06-29T15:44:37Z
2016-06-29T15:44:37Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/68276
 
Language en
 
Relation D9066;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY