Studies on Genetic Variability, Heritability, Correlation and Path Analysis in Chrysanthemum (Dendranthema grandiflora Tzvelev)

Abstract

The studies were conducted in the Division of Flower and Medicinal Crops, ICAR-Indian Institute of Horticultural Research, Bengaluru to evaluate twenty genotypes of chrysanthemum under naturally ventilated polyhouse during 2019–21. The experiments were laid out in CRD with three replications for growth and flowering traits to determine the variability, heritability, genotypic and phenotypic coefficient of variation, correlation and path coefficient among 9 quantitative traits. Results revealed that magnitude of the genotypic coefficient of variation (GCV) was higher than phenotypic coefficient of variation (PCV) for all the traits. High (>20%) PCV and GCV was recorded for number of flowers per plant, plant height, number of branches plant-1, number of leaves plant-1, flower diameter and days to bud initiation. Heritability estimates ranged from 82% (number of branches plant-1) to 99% (plant height). High heritability coupled with high genetic gain as per cent of mean was recorded for all the traits studied. The number of flowers plant-1 exhibited positive and significant correlation with number of branches plant-1, number of leaves plant-1, days to bud initiation and days to optimum flowering. Path coefficient analysis using correlation coefficients revealed that days to optimum flowering, plant height and days to bud initiation contributed highest positive direct effect on number of flowers plant-1. Therefore, the selection on the basis of traits viz., number of branches plant-1, number of leaves plant-1, days to bud initiation and days to optimum flowering will be more effective for improvement of traits in breeding of chrysanthemum.

Correlation coefficients for yield and Path analysis in Crossandra genotypes for yield and its attributing traits

“…Thus, selecting based on these characteristics will enhance performance and improve the flower yield. These agree with the results of Veluru et al (2019) [27] in China and Bennurmath et al (2022) [6] in chrysanthemum.…”

“…Kumar et al (2019) [14] in Marigold stated that flower yield per hectare positively correlated with plant height, plant spread, dry weight of flower, number of flowers per plant, flower diameter and flower yield per plant. Bennurmath et al (2022) [6] observed similar results in chrysanthemum. At phenotypic level, flower yield trait exhibited significantly positive correlation with traits like number of spikes per plant (0.922), number of flowers per spike (0.869), spike length (0.847), shelf life (0.827), leaf area (0.824), total chlorophyll (0.831), 100 flower weight (0.623), plant height (0.778), primary branches per plant (0.593) and secondary branches per plant (0.537).…”

Evaluation of growth-promoting agents on saffron yield and quality

“…observed a positive correlation between ower size and other oral traits in diploid Roses. The same as our result positive signi cant correlation with days to owering, ower size, and some other oral traits was reported byKumar et al (2012). As picrocrocin and crocin belong to glycoside compounds and sugar is one of the main components of glycosides,(Tung et al 2022) the negative correlation between sugar and these two compounds in this study seemed reasonable thoroughly.…”

Influence of Planting Date and Growth Stimulants on Growth and Chemical Compositions of Euphorbia milii Plant

“…In this concern, Sainath et al, (2014) On chrysanthemum wreath L, Gupta et al (2015) On China aster, Bergmann et al ( 2016) On Euphorbia pulcherrima, Gad et al (2016) on Ixora coccinea. Gaurav, et al (2016) in Dendranthema grandiflora, Kudmate, et al (2016) on chrysanthemum plants, Mohamed (2017) on an aster plant (Symphyotrichum novi-belgii L.) and Bahmanyar (2020) on African marigold found that application of gibberellic acid at a concentration of 100 mg/L improved the vegetative and roots growth. El-Kinany et al ( 2019) on three Gaillardia cultivars, Thakur and Kumar (2020) in the Rosa damascena mill.…”