Variability, Association and Principal Component Analysis in Gmelina arborea
2025
Parthiban, K.T. | Krishnakumar , N | S. Revathi | V. Subbulakshmi | R. Ashick Rajah
Gmelina arborea is commonly known as gamhar belongs to the family lamiaceae is one of the important multipurpose and fast growing tree species highly amenable for multifarious industrial utility. However, this species received little research attention and hence a systematic tree improvement programme has been started with collection of 32 superior progenies from its natural and introduced ranges distributed in three southern states of India. The progeny evaluation test indicated that all progenies exhibited significant variation for height, clean bole height, girth at breast height, basal girth, volume and clean bole volume. Among 32 progenies evaluated, the superiority of progeny viz., FCRI GA 08 and FCRI GA 09 is very well witnessed due to higher growth attributes. The genetic analysis indicated that, phenotypic coefficient of variation was higher than the genotypic coefficient of variation for all the six traits. High heritability with high genetic advance was observed for tree height and Girth at breast height. Basal girth showed positive correlation and direct effect on clean bole volume. The genetic diversity analysis resolved 32 progenies into six clusters and cluster I was largest with 17 progenies. Highest cluster mean for tree height, basal girth and volume was exhibited by cluster V and cluster VI for clean bole height, girth at breast height and clean bole volume. Maximum divergence was contributed by girth at breast height and clean bole volume. Six principal components were grouped in PCA in which PC 1 and PC 2 contributed 86.72% of total variability. In a holistic perspective, the study identified superiority of two progenies viz FCRI GA 08 and FCRI GA 09 for immediate adoption and revealed the existence of wide range of genetic diversity thus extends greater scope for future breeding programme in Gmelina arborea.
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