Phenotypic Diversity and Genetic Variation within a Collection of Onion (Allium cepa L.) Germplasm from Peninsular India

Phenotypic Diversity and Genetic Variation within a Collection of Onion (Allium cepa L.) Germplasm from Peninsular India

Twenty three diverse germplasm lines collected from varying agro-ecological regions of Peninsular India during 2007-08 were characterized and evaluated along with three controls viz. Nasik Red, Light Red and White Marglobe, in an augmented block design during kharif 2009-10, at NBPGR Regional Statio...

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Bibliographic Details
Main Author: Neelam Sunil, Vinod Kumar, Medagam Thirupathi Reddy, Venkateshwaran Kamala
Format: Article
Language:English
Published: Indian Society of Plant Breeders 2014-12-01
Series:Electronic Journal of Plant Breeding
Subjects:
Light Red and White Marglobe
in an augmented block design during kharif 2009-10
at NBPGR Regional Station
Rajendranagar
Hyderabad. The accessions exhibited good variation for qualitative traits like early seedling vigour
leaf cross section
leaf arrangement
stem shape
bulb shape
bulb skin color
bulb size
bulb hearting and bulb flesh colour and quantitative traits like plant height
number of leaves per plant
leaf length
leaf girth
number of scales per bulb
total soluble solids (TSS) (°Brix)
bulb weight and bulb yield per plant. Correlation study revealed that high significant positive correlation was recorded between number of scales per bulb and bulb weight (r=0.71) and significant negative correlation was observed between leaf length and leaf girth (r= -0.88)
leaf length and bolting (-0.63) among others. Principal component analysis (PCA) revealed that the first four principal components explained 99.76% of the total variation among the 23 accessions and three controls. PCA I accounted for 97.04% of variation
had maximum influence on bulb weight followed by plant height. The PCA II traits were leaf length and plant height which accounted for 1.97 % of the variance. The PCA III and PCA IV have contributed for 0.39 and 0.39% of total variance. The cluster analysis revealed that dendrogram formed four distinct clusters and cluster III was found to be the largest including controls. The promising accessions for bulb weight were IC 571959
IC 564056
IC 571927
IC 571919 and IC 564059
Onion
cluster analysis
germplasm
Online Access:https://sites.google.com/site/ejpb2014/vol-5-4/EJPB_V5_N4_743-751.pdf?attredirects=0&d=1

Internet

https://sites.google.com/site/ejpb2014/vol-5-4/EJPB_V5_N4_743-751.pdf?attredirects=0&d=1

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