Analysis of genetic parameters in commercially important monopodial orchid genotypes

T. Beena, C. Lekha Rani
Fifteen genotypes of monopodial orchids belonging to six genera Aranda, Aranthera, Kagawara, Mokara, Renanthera and Vanda with good cut flower qualities and high demand in the market were evaluated adopting completely randomized design with ten replications. Observations were collected for vegetative and floral characters from the selected genotypes and genetic parameters were studied. High phenotypic and genotypic coefficients of variation were observed for thickness of leaf, leaf area and number of aerial roots indicating high variability for these characters and scope for improvement through selection. Genetic advance (% mean) was high (›70) for six characters considered. It was exhibited in the range of 30-70% by 16 characters analysed. High heritability (›70%) and 30-70% genetic advance was observed for 16 characters. High heritability (›70%) combined with genetic advance greater than 70% was observed for number of aerial roots, width of leaf, thickness of leaf, leaf area, number of spikes per shoot and number of flowers per inflorescence, indicating additive gene action for these characters. This suggests that permanent improvement could be attained by practicing selection on the above traits.
Beena, T. and Lekha Rani, C. 2017. Analysis of genetic parameters in commercially important monopodial orchid genotypes. Acta Hort. (ISHS) 1165:101-106
coefficient of variation, heritability, genetic advance, additive gene action