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Start codon targeted polymorphism for evaluation of functional genetic variation and relationships in cultivated castor (Ricinus communis L.) genotypes

In the present study, 111 castor genotypes were differentiated by the DNA
 fingerprinting patterns using 37 SCoT primers. The selected primers
 amplified DNA fragments across the 111 genotypes studied with the number of
 amplified fragments varying from 3 (SCoT 14) to 10 (SCoT 30 and SCoT 44) and
 the amplicon size varied from 100 to 3000 bp. Of the 246 amplified bands,
 186 were polymorphic with an average of 5.03 fragments per primer. The
 percentage of polymorphic bands ranged from 57.14 % (SCoT 34) to 100.00 %
 (SCoT 28 and SCoT 33) with an average of 77.50%. The polymorphic information
 content (PIC) values varied from 0.372 (SCoT 14) to 0.818 (SCoT 30) with an
 average of 0.677. A dendrogram was constructed from a genetic distance
 matrix based on profiles of the 37 SCoT primers using the unweighted
 pair-group method with the arithmetic average (UPGMA). According to
 analysis, the collection of 111 diverse accessions of castor was clustered
 into two main clusters (1 and 2). The first cluster were subdivided into two
 subclusters (1a and 1b). Subclaster 1a contained 11 genotypes of castor and
 subclaster 1b contained 6 genotypes of castor. Subclaster 2 were subdivided
 into two subclusters (2a and 2b). Subclaster 2a contained 44 castor
 genotypes and subclaster 2b contained 50 castor genotypes. Results showed
 the utility of SCoT markers for estimation of genetic diversity of castor
 genotypes leading to genotype identification.