Genetic divergence analysis of garden cress (Lepidium sativum L.)


Temesgen Bedassa, Mebeaselassie Andargie and Million Eshete3

The D2 analysis allowed the 49 garden cress accessions to be classified into seven distinct clusters. Cluster 1 included 16 accessions that mature and flower early. Cluster 2 contained 11 accessions, which had the higher mean values for both numbers of primary and secondary branches, harvest index and seed yield/plant. They also showed higher number of seeds per plant and per plot than the overall mean value. Cluster 3 had 15 accessions which had a relatively high biomass yield per plot. Cluster 4 included only one accession having longer height at flowering, high seed yield per plant and harvest index. Similarly, cluster 5 also had one accession which was characterized by late flowering, but very short in height at flowering. Cluster 6 also included a single accession, which is characterized by early flowering and maturity. The last cluster, cluster 7 had 3 accessions which had high seed yield per plant, harvest index and essential oils. The maximum inter-cluster distance (D2 = 10.11) was observed between clusters 5 and 6 whereas the lowest value (D2 = 3.07) was between cluster 2 and 4. Biomass yield per plot and number of seeds per plant contributed the maximum towards divergence in the existing germplasm.


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