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EVALUATION OF COTTON (Gossypium hirsutum L.) GENOTYPES FOR HEAT TOLERANCE

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Title EVALUATION OF COTTON (Gossypium hirsutum L.) GENOTYPES FOR HEAT TOLERANCE
 
Creator ASHA, R
 
Contributor LAL AHAMED, M
 
Subject cotton, yields, genotypes, sowing, genetics, tolerance, biological phenomena, gossypium hirsutum, planting, heritability
 
Description The present investigation was carried out during kharif 2011-12 with 40
genotypes of cotton (Gossypium hirsutum L.) at Agricultural College Farm,
Bapatla to elicit information on heat tolerance of cotton genotypes using cellular
membrane thermostability and enzyme viability along with the variability,
heritability, genetic advance as per cent of mean, character association and the
magnitude of direct and indirect effects of 14 yield component traits on seed
cotton yield plant-1 viz., plant height, days to 50% flowering, number of
monopodia plant-1, number of sympodia plant-1, number of bolls plant-1, boll
weight (g), seed index (g), lint index (g), ginning out-turn (%), 2.5% span length
(mm), micronaire (10-6g/in), bundle strength (g/tex), uniformity ratio and fibre
elongation (%).
The genotypic coefficients of variation for all the characters studied were
less than the phenotypic coefficients of variation indicating the masking effect of
the environment. High heritability coupled with high genetic advance as per cent
of mean was observed for characters like number of monopodia plant-1, number
of sympodia plant-1, number of bolls plant-1, boll weight, seed index, lint index,
micronaire and seed cotton yield plant-1 indicating the predominance of additive
gene action and hence, direct phenotypic selection may be useful with respect to
these traits.
The correlation and path coefficient analyses together indicated that
number of bolls plant-1 and boll weight had significant positive and positive
direct effects on seed cotton yield plant-1 indicating the existence of true
relationship among these characters and their exploitation in selection
programmes.
In the heat tolerance studies, cellular membrane thermostability and
enzyme viability clearly indicated the genotypic differences for thermotolerance.
The mean relative electrical conductivity values showed gradual increase from
32.06 at 250C to 84.15 at 500C indicating higher temperatures had direct effect
on the leakage of fluids from the cells and higher levels of cell injury. The
dehydrogenase enzyme viability was reduced with the increase in the
temperature from 300C and 500C.
The genotypes L788, RAH 912 and Pee Dee 0113 showed high levels of
heat tolerance in both the experiments at 500C and these genotypes can exploited
in the breeding programmes for heat tolerance.
This study clearly indicates the use of cellular membrane thermostability
and enzyme viability assay for assessing heat tolerance in cotton
 
Date 2016-06-22T11:44:50Z
2016-06-22T11:44:50Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67671
 
Language en
 
Relation D9403;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY