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GENETIC DIVERSITY ANALYSIS IN COTTON USING MORPHOLOGICAL TRAITS ( Gossypium hirsutum L.)

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Title GENETIC DIVERSITY ANALYSIS IN COTTON USING MORPHOLOGICAL TRAITS ( Gossypium hirsutum L.)
 
Creator Bhagat, Nilesh S
 
Contributor Patil, Dr. B. R.
 
Subject null
 
Description "Cotton comprises of approximately 45 diploid and five
allotetraploid species that occur naturally through the semiarid and arid
region of Africa, Australia Central and South Africa, the Indian
subcontinent, Arabia, Galapagos, and Hawaii (Fryxell, 1992). During the
course of evolution and domestication man has selected four species for
cultivation whose seed fibres were long and spinnable. Among the four
cultivated species, G.arboreum L. and G. herbaceum both are diploid
(2n=26) and popularly ca lled as Asiatic cotton while, G. hirsutum L. and G.
barbadence both are allotetraploid (2n=52) and known as American upland
and Egyptian cotton, respectively."
"A study ""Genetic diversity analysis in cotton using
morphological traits (G.hirsutum L.)"" was undertaken to estimate the
degree of divergence among the 50 genotypes of upland cotton using
multivariate Mahalanobis 0 2 statistics at Cotton Research Unit,
Panjabrao Deshmukh Krishi Vidyapeeth, Akola.
The analysis of variance revealed significant differences
among 50 genotypes for all fourteen characters. This is also confirmed by
Wilk's criterion .
The canonical analysis revealed that about 85.96 per cent of
the total variation was accounted by the first six canonical roots. In vector I.
number of monopodia per plant was important sources of variation.
Whereas 2.5 per cent span length was important sources of variation in
vector II. In vector Il l, number of bolls per plant, in vector IV seed index, in
vector V, fibre strength and in vector VI, number of bolls per plant played
important role in variation. Plant height, seed index and number of bolls per
plant were contributing towards genetic divergence.
By using Tocher's method, all 50 genotypes were grouped
into seven clusters. Cluster I had highest number of genotypes (19)
followed by cluster Ill (14), cluster IV (8), cluster II (6) and clu ster V, VI and
VII represented by single genotypes. The maximum genetic distance was
recorded between cluster V and cluster VII (D=9.66)
By considering the mean statistical distance as a guideline to
select the divergent genotypes, 18 cluster combinations were identified.
The divergent parents selected from these combinations may yield better
segregants in hybridization programme. However, when divergent parents
are crossed , heterosis is not always found to occur. Therefore, while
selecting the divergent parents from a particular cluster, the information on
mean and standard deviation of the genetic variance among the divergent
parents should be taken into consideration as practically suggested by
Arunachalam and Bandyopadhyay (1984). Hence, on the basis of mean
and standard deviation of parental divergence, 41 cross combinations out
of 192 parental combinations have been finally suggested which are
expected to yield desirable genetic gain in breeding programmes."
 
Date 2018-10-17T11:10:38Z
2018-10-17T11:10:38Z
2012
 
Type Thesis
 
Identifier "BHAGAT NILESH SHANTARAM (2012), GENETIC DIVERSITY ANALYSIS IN COTTON USING MORPHOLOGICAL TRAITS ( Gossypium hirsutum L.), DEPARTMENT OF AGRICULTURAL BOTANY, POST GRADUATE INSTITUTE, AKOLA, DR. PANJABRAO DESHMUKH KRISHI VIDYAPEETH, AKOLA, Msc 2012, 75p"
http://krishikosh.egranth.ac.in/handle/1/5810081713
 
Language en
 
Format application/pdf
 
Publisher Dr. Panjabrao Deshmikh Krishi Vidyapeeth, Akola, Maharashtra.