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Studies on genetic analysis & character association in different genotypes of onion (Allium cepa L.)

KrishiKosh

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Title Studies on genetic analysis & character association in different genotypes of onion (Allium cepa L.)
 
Creator Solanki, Pritibala
 
Contributor Jain, P.K.
 
Subject yields, planting, genotypes, onions, genetics, biological phenomena, developmental stages, heritability, grading, phenotypes
HORTICULTURE
 
Description ABSTRACT


The present investigation entitled “Studies on genetic analysis & character association in different genotypes of Onion (Allium cepa L.)” was conducted at Horticulture Complex, Department of Horticulture, College of Agriculture, J.N.K.V.V., Jabalpur (M.P.) during the year 2014-
2015. The experimental materials for the present investigation was comprised of 31 genotypes of onion were transplant on plot size 3.0 m x
2.0 m in Randomized Complete Block Design with three replications, to estimate the genetic variability and association analysis (Correlation and Path coefficient). The row and plant spacing was maintained at 15 cm and 10 cm respectively and each plot accommodated 400 plan ts. Observations were recorded on the basis of five random competitive plants selected from each genotype separately for quantitative and qualitative parameters were evaluated as per standard procedure. The main objectives were in investigation first one to estimate the genetic variability, heritability & genetic advance in genotypes of onion. Second to find out the correlation and path coefficients analysis between yield and its attributing characters and third to identify better performing genotypes in Onion.

Analysis of variance revealed highly significant difference among the genotypes for all the characters studied. The variation was the highest for total bulb yield q ha-1 followed by marketable yield q ha-1, incidence percentage of stemphyllium blight disease, bulb yield plant-1, incidence
percentage of thrips, unmarketable yield q ha-1, C grade bulbs percentage,

plant height at 90 DAT, plant height at 60 DAT, B grade bulbs percentage, days to maturity, bolter bulbs percentage, plant height at 30 DAT, double bulbs, A grade bulbs percentage, number of leaves plant-1 at 90 DAT, total
soluble solid, polar diameter, equatorial diameter, number of leaves plant-1 at

60 DAT, number of leaves plant-1 at 30 DAT, neck thickness and polar: equatorial of bulb. The PCV was higher than the GCV for all the characters .High PCV and GCV was observed for B grade bulbs, unmarketable bulb yield q ha-1, marketable bulb yield q ha-1, total bulb yield q

ha-1 and bulb yield plant-1, indicating greater diversity for these traits and their further improvement through selection. High heritability supplemented with high genetic advance as percentage of mean was manifested by bulb yield plant-1 and total yield q ha-1, suggested that they can be improved through direct selectio n. The association studies indicated that the advantages of upgrading onion genotypes through simultaneous selection for equatorial diameter, followed by polar diameter, number of leaves plant-1 at 90 DAT, neck thickness, plant height at 90 DAT and TSS. Path coefficient analysis revealed that polar diameter had the highest positive direct effect followed by plant height at 60 DAT, TSS, plant height at 90 DAT, number of leaves plant-1 at 90 DAT and polar: equatorial
were the most important characters contributing towards bulb yield plant-1 and

hence purposeful and balanced selection based on these characters would be made rewarding for improvement of Onion. Direct selection of equatorial diameter, neck thickness, days to maturity, number of leaves plant-1 at 30
DAT, number of leaves plant-1 at 60 DAT and plant height at 30 DAT should

be avoided instead of indirect selection. The highest production observed in genotype OSR–1344 (351.92 q ha-1) and Agrifound Light Red (ALR) (309.87 q ha-1). These showed bolting resistance i.e. (0.00%). Low incidence percentage of stemphylium blight was found in genotype ON14-06 (7.33 %) and low incidence percentage of thrips was found in genotype ON14-15 (16.33 %). Considerable variability was observed among the genotypes for
foliage character, bulb shape, bulb colour and bolting tendency. Foliage colour in green onion and shape and colour of onion bulb are most important characteristics to help customers in choosing cultivars on the market.
 
Date 2016-06-23T14:20:25Z
2016-06-23T14:20:25Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67859
 
Language en
 
Format application/pdf
 
Publisher JNKVV