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GENETIC EVALUATION OF CMS BASED AND CONVENTIONAL HYBRIDS IN COTTON (Gossypium hirsutum L.)

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Title GENETIC EVALUATION OF CMS BASED AND CONVENTIONAL HYBRIDS IN COTTON (Gossypium hirsutum L.)
 
Creator BAGADE, ASHISH B.
 
Contributor VASHI, P.S.
 
Subject hybrids, cotton, planting, sowing, crossing over, yields, animal husbandry, heterosis, agreements, biological phenomena
 
Description In cotton, the hybrid seed is produced by the conventional
system of hand emasculation and pollination, which renders the cost of
hybrid seeds expensive. Another disadvantage in this method is the low
recovery of seed set ranging from 7 to 35 per cent particularly in the case
of interspecific hybrids. On the contrary, a better seed set is achieved in
the hybrids which are developed using cytoplasmic male sterility, as
mechanical injury of the ovary during hand emasculation is avoided
resulting in cheaper hybrid seed production (Davis, 1978). In the present
study, manifestation of heterosis, combining ability and stability
parameters were studied in CMS based hybrids to explore the possibilities
to develop CMS based intra hirsutum hybrid for commercial cultivation.
The experimental material consisted of two cytoplasmic male
sterile lines, eight restorers and their sixteen resultant hybrids of each
method (CMS Aridum, CMS Harknessii and conventional) were tested for
12 characters including seed cotton yield at three locations in randomized
block design replicated thrice during kharif 2004.
Significant differences were observed among parents and
hybrids which revealed considerable genetic variation in the material.
Heterosis to the extent of 38.02 and 29.13 per cent was
observed for seed cotton yield in CMS Aridum and CMS Harknessii
system as against 53.61 per cent in conventional system indicating good
scope of exploiting heterosis commercially using CMS lines. Crosses PH
93 x G cot 10, PH 93 x Surat dwarf and LRK 516 x Line 203 were the
most heterotic and high yielding hybrids in all the three methods.
Combining ability analysis revealed involvement of both
additive and non-additive gene effects in the inheritance of all the traits,
however, non-additive gene action was preponderant. Parents LRK 516, G
cot 10, Surat dwarf and Line 203 were found to be good general
combiners for seed cotton yield and some of the related traits. Per se
performance of parents showed close association with their gca effects
while no such relation was observed between sca effects of hybrids and
their per se performance. Cross combination LRK 516 x DS-70-480
exhibited significant high positive sca effect for seed cotton yield in all
the three methods.
Stability analysis revealed the presence of significant genetic
variability in the material for all the characters. Significant mean square
values due to environment for monopodia per plant, sympodia per plant
and seed cotton yield in all the three systems suggested that genotypes
interacted considerably with the varying environments and major portion
of the interaction was accounted for by the linear component in respect of
these traits. Significance of G x E (linear) when tested against pooled
error indicated possibilities of prediction of seed cotton yield performance
of the genotypes over the environments. G cot 10 was found to be the
most stable parent while PH 93 x G cot 10 was average stable hybrid for
seed cotton yield.
Use of biparental progeny selection to isolate desirable
transgressive segregants is suggested while recurrent selection approach
would be effective in order to exploit both additive and non-additive gene
effects.
 
Date 2016-03-05T10:15:56Z
2016-03-05T10:15:56Z
2005-12
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64833
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari