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EVALUATION OF GENOTYPES FOR GENETIC DIVERGENCE AND FUSARIUM WILT RESISTANCE IN CASTOR (Ricinus communis L.)

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Title EVALUATION OF GENOTYPES FOR GENETIC DIVERGENCE AND FUSARIUM WILT RESISTANCE IN CASTOR (Ricinus communis L.)
 
Creator SHAIK ZAREENA BEGUM
 
Contributor FARZANA JABEEN
 
Subject GENOTYPES, GENETIC, DIVERGENCE, FUSARIUM, WILT, RESISTANCE, CASTOR
 
Description The present investigation was carried out during kharif 2007-08 at
Regional Agricultural Research Station (RARS), Palem, Mahabubnagar
District, which consist of two different experiments viz., Experiment-I, with
fifty genotypes of castor studied for genetic divergence and Experiment-II,
with other One hundred and fifty germplasm lines of castor (Ricinus communs
L.) screened for Fusarium wilt resistance.
In Experiment-I, the mean, variability, heritability, genetic advance,
genetic divergence, correlation and path coefficient analysis were studied for
ten characters viz., days to 50 per cent flowering, days to maturity, plant
height, number of nodes upto primary spike, number of spikes per plant,
effective spike length, number of capsules per plant, 100 seed weight, oil
content and seed yield per plant.
The analysis of variance revealed significant differences among the
genotypes for all the characters studied indicating that the data generated from
the above diverse material representing wide variability. The genotypic
coefficients of variation for all the characters studied were lesser than the
phenotypic coefficients of variation indicating the modifying effect of the
environment in association with the characters at genotypic level. High PCV
coupled with high GCV observed for plant height, number of spikes per plant,
effective spike length, number of capsules per plant. Seed yield per plant
indicate the presence of wider variability for these traits in the population
studied. High heritability coupled with high genetic advance as per cent of
mean was observed except for days to maturity indicates preponderance of
additive gene action in the inheritance of these traits and improvement in these
characters is possible through simple selection.
The results of multivariate analysis indicated the presence of
considerable genetic divergence among the 50 genotypes studied. The 50
genotypes were grouped into 8 clusters. Clustering pattern of genotypes did
not follow geographical origin, suggesting that geographic isolation may not
be the only factor causing genetic diversity. Out of 10 characters studied, seed
yield per plant followed by oil content contributed maximum towards
divergence. Based on these studies crosses may be made between the
genotypes of cluster II viz., 48-1, DCS-107, DCS-9 and cluster VIII viz., PCS-10,
PCS-3, PCS-29, PCS-56 followed by cluster II viz., 48-1, DCS-107, DCS-9 and
cluster V viz., PCS-70, PCS-72, PCS-44, PCS-15, PPC-2, MCI-5, PCS-23, PCS-45,
PCS-63, PCS-8, JC-2 and cluster II viz., 48-1, DCS-107, DCS-9 and cluster IV viz.,
PPC-9, PCS-12, PPC-5, PCS-50, PCS-22, PPC-1, PCS-40, PCS-47, PCS-1, PCS-34,
PCS-31, PCS-16 to obtain new desirable recombinants in castor.
The correlation studies indicated that number of spikes per plant,
effective spike length, number of capsules per plant, 100 seed weight and oil
content had significant positive association with seed yield per plant hence
simultaneous improvement of these characters along with seed yield is
possible.
The path analysis indicated that capsules per plant had direct positive
effect on seed yield. Direct selection through this trait for improvement of seed
yield is highly effective. In case of number of spikes per plant and 100 seed
weight though the associations are positive and significant, direct effects are
low indirect effects through effective spike length, number of capsules per
plant and plant height are to be considered to bring about improvement in seed
yield.
Thus, the present study revealed that the major emphasis should be laid
on selection process with more number of spikes per plant, number of capsules
per plant and increased 100 seed weight for realizing higher seed yield in
castor (Ricinus communis L.).
In Experiment-II, screening of germplasm lines for resistance to wilt
and percent disease incidence was calculated. Among one hundred and fifty
entries tested, fifteen entries viz., RG-21, RG-425, RG-445, RG-453, RG-457,
RG-572, RG-587, RG-625, RG-689, RG-709, RG-743, RG-788, RG-789, RG-811
and RG-819 were recorded as resistant. So these entries can be used in different
crossing programmes for the development of hybrids with wilt resistance.
 
Date 2016-07-30T12:26:07Z
2016-07-30T12:26:07Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70271
 
Language en
 
Relation D8310;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD