Classification for Core Collection of Rapeseed-Mustard (Brassica juncea L.) Germplasm
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Abstract
Based on passport data of maturity (early, medium and late), stratified random sampling procedure was adopted
to select 385 accessions of Indian mustard (Brassica juncea L.) maintained at NRCRM, Bharatpur, India, which
was taken for this study. Observations of 17 characters were taken into consideration for the classification. All
the accessions were classified in 9 clusters. Core collections of different cluster were selected with the help of
following method, which is the main objective of the project. Mean ± SD of each character of different clusters
were calculated and taken into consideration for selecting the core accessions of each cluster. All the characters
in different clusters were studied and the character that has more than Mean ± SD was marked rank first. All the
accession that ranked first in a minimum of four characters, were selected as core collection of that group. This
way, out of 385 accessions only 116 accessions were selected as core collection, which is 30.13%. Now, it will
be easy to maintain and easierfor the breeder to select for breeding purposes. Viewing the Euclidean square distance,
different accession of Brassica can be selected for breeding purposes as per the requirements of the breeder.