Variability assessment of Navara (Oryza sativa L.) germplasm–the traditional medicinal rice of Kerala for quantitative traits

Navara a rice cultivar of Kerala is considered as a land race with specific attributes making it suitable in traditional ayurvedic medical system of Kerala. However, the different medical practitioners use different types of navara and they attribute the medicinal property to the one they are using. In order to asses the variability in navara germplasm, the entries were raised in replicated trial at Regional Agricultural Research Station, Pattambi. Detailed morphological characterization for quantitative traits based on IRRI descriptors was under taken. Of the seventeen quantitative traits considered, the entries differed among themselves in fifteen characters. Only in the case of grain width and straw yield there was no significant difference between the entries tested. Hierarchical clustering using between group linkage as the clustering method and squared Euclidean distance as the interval in the dendrogram, showed three major clusters at 10 units.