Record Details

COMBINING ABILITY AND HETEROSIS STUDIES IN CASTOR (Ricinus communis L.)

KrishiKosh

View Archive Info
 
 
Field Value
 
Title COMBINING ABILITY AND HETEROSIS STUDIES IN CASTOR (Ricinus communis L.)
 
Creator YOGITHA, K
 
Contributor BHARATHI, M
 
Subject COMBINING, ABILITY, HETEROSIS, CASTOR
 
Description The present investigation on “combining ability and heterosis studies in
castor (Ricinus communis L.)” was carried out with twelve lines (PPL-11,
PPL-12, PPL-13, PPL-14, PPL-15, PPL-16, PPL-17, PPL-18, PPL-19, PPL-
20, PPL-21 and PPL-22) and three testers (48-1, DCS-107 and JC-2). During
kharif 2007 the twelve elite inbred lines were crossed with three testers in
line x tester design, at Regional Agricultural Research Station, Palem.
Subsequently during Rabi, 2007-08 the 36 F1 crosses along with parents (Lines
x Testers) and standard checks (DCH-177 and GCH-4) were evaluated at
Regional Agricultural Research Station, Palem, Mahaboobnagar. The data
were collected for 10 characters viz., days to 50 per cent flowering, days to
maturity, plant height, number of nodes upto primary spike, effective spike
length, number of spikes per plant, 100 seed weight, oil content, number of
capsules per plant and seed yield per plant. The data were analysed for
estimation of combining ability, heterosis, nature of gene action, correlation
and path analysis.
The analysis of variance for combining ability revealed significant
differences among the lines, testers and line x testers for all the traits studied.
Further, non-additive gene action was found to be preponderant for seed yield
and yield components in the present investigation favouring a hybrid breeding
programme.
Combining ability analysis revealed that among the parental lines PPL-
20, PPL-19, PPL-21, PPL-14, PPL-17 and 48-1 were found to be good general
combiners for early flowering. Further, parents PPL-21, PPL-16, PPL-20,
PPL-19, PPL-12, 48-1 and DCS-107 were found to be early maturing. More
over parents PPL-20, PPL-21, PPL-14, PPL-16, PPL-19 and DCS-107 were
adjudged as the best general combiners for seed yield per plant. The parental
lines viz., PPL-20, PPL-16, PPL-21, PPL-14 and 48-1 possessed favourable
genes for oil content. Hence, the female lines possessing good combining
ability for seed yield may be crossed to the best combining male parents for
earliness and related traits or vice versa in order to obtain desirable segregants.
The hybrids PPL-14 x JC-2, PPL-16 x 48-1 and PPL-22 x 48-1, PPL-22
x DCS-107 are good specific combiners for earliness. The hybrids PPL-18 x
JC-2, PPL-14 x JC-2, PPL-17 x 48-1, PPL-21 x DCS-107 and PPL-20 x 48-1
which recorded positively significant sca effects for seed yield were the good
specific combiners. Therefore, these hybrids could be recommended for
heterosis breeding.
The maximum values of heterosis over mid parent and better parent was
observed in the cross combinations, PPL-20 x 48-1 followed by PPL-17 x 48-
1, PPL-11 x DCS-109, PPL-21 x DCS-107 and PPL-14 x JC-2. High heterotic
response in these hybrids for seed yield per plant resulted mainly due to the
substantial heterosis for other important yield contributing characters. These
hybrids along with PPL-18 x JC-2 were found significantly superior over the
better check, GCH-4 and could be exploited through heterosis breeding
programme following proper testing.
The seed yield per plant exhibited significant positive correlation with
effective spike length, number of spikes per plant, 100 seed weight, oil content
and number of capsules per plant, indicating the importance of these characters
in selection.
Studies on path coefficient analysis emphasized the need for selection,
based on number of capsules per plant, 100 seed weight, plant height, number
of nodes upto primary spike, days to maturity, effective spike length and oil
content. Since, these were found to be the important direct contributors for
seed yield.
 
Date 2016-07-30T13:49:23Z
2016-07-30T13:49:23Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70282
 
Language en
 
Relation D8313;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD