STUDIES ON CHARACTERISATION AND GENETIC DIVERSITY IN CASTOR (Ricinus communis L.) GENOTYPES
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Date
2007
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
Abstract
The present study was conducted to evaluate 55 castor genotypes for
the characteristics suitable for DUS testing in castor, to assess genetic
diversity among the genotypes, to assess the association between characters
and to identify the direct and indirect effects of yield components on seed
yield in castor. The material for investigation comprised of 51 parental lines
and four checks – DCS-9, Kranti, Harita and Kiran were grown in a
randomized block design in two replications during kharif 2006 at Directorate
of Oilseeds Research, Hyderabad.
All the 55 genotypes were evaluated and characterized for highly
heritable important thirty characters like waxi bloom, stem colour,
anthocyanin pigmentation of young emerging leaves, leaf shape, lascination of
leaf, petiole length, plant branching pattern, type of flowers on primary
raceme, capsule spininess, spike compactness, seed shape, seed colour, seed
mottling and seed caruncle etc. The genotypes exhibited sufficient variation
for majority of the states of expression of these thirty characteristics were
found useful.
Based on Mahalanobis D2 analysis, the fifty five genotypes were
grouped into eight clusters. Greater genetic divergence found between cluster
III and VII could be exploited in the hybridization programme for obtaining
segregants with high yield potential.
The character association studies revealed that seed yield was positively
associated with effective spikes per plant, number of capsules on main spike,
total length of main spike, effective length of main spike, oil content and 100
seed weight while days to 50 per cent flowering, number of nodes upto
primary raceme and plant height recorded negative association with seed
yield.
Path coefficient analysis revealed that the characters; number of
capsules on main spike, effective length of main spike, total length of main
spike, effective spikes per plant, oil content and 100 seed weight had positive
direct effect on seed yield while, days to 50 per cent flowering, plant height,
number of nodes upto primary raceme showed negative direct effects.
The results of the study suggested that the characters viz., effective
spikes per plant, number of capsules on main spike, effective length of main
spike and 100 seed weight could be given more emphasis for isolation of
desirable genotypes, with high genetic potential for seed yield.
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Keywords
STUDIES, CHARACTERISATION, GENETIC, DIVERSITY, CASTOR, GENOTYPES