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<p>Chrysanthemum (<i>Dendranthema grandiflora</i> Tzvelve) is one of the most widely cultivated herbaceous perennial flowering plants belonging to the Asteraceae family. Every year, many varieties are being added by the government and private agencies. Therefore, there is a wide range of variation, but very little attention has been given to its improvement. For effective selection, it is necessary to separate genetic variability from total variability, which will help breeders adopt suitable breeding programmes. There is a need for the identification of varieties suitable for growing in different agroclimatic conditions for specific purposes. Fifty genotypes of chrysanthemum were evaluated in a randomized complete block design during the year 2022 (<i>Kharif</i>) to determine genetic variability, heritability and genetic advance for different quantitative and qualitative traits. Analysis of variance revealed significant differences among genotypes for all the characteristics studied. The results revealed that the magnitude of the phenotypic coefficient of variation (PCV) was greater than that of the genotypic coefficient of variation (GCV) for all the traits, viz., the number of primary branches, number of secondary branches, duration of flowering, number of flowers per plant, weight of one hundred flowers, yield per plant, flower diameter, total number of ray florets per flower head, petiole length, shelf life and disc diameter, indicating genotype and environment interactions. Highest heritability coupled with genetic advance as a percentage mean was found for all the traits. The characteristics associated with high heritability with high genetic advancement as a percentage of the mean may be used as selection criteria in the genetic improvement of yield. Based on the analysis of genotypic and phenotypic correlations and path coefficients, it is suggested that an ideal Chrysanthemum genotype for achieving higher flower yield per plant should possess the following characteristics: increased plant height, longer petiole length, higher weight of 100 flowers and a greater number of flowers per plant. Therefore, selection based on these attributes would result in genetic advances in flower yield per plant.</p>

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Assessment of the Variability, Genetic Diversity and Character Associations of Chrysanthemum (Dendranthema grandiflora Tzvelve) Based on Qualitative and Quantitative Traits

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • G. B. Kavana,
  • G. K. Seetharamu,
  • Rajiv Kumar,
  • D. Satish,
  • Amreen Taj,
  • Amruta S. Bhat,
  • R. Venugopalan

摘要

Chrysanthemum (Dendranthema grandiflora Tzvelve) is one of the most widely cultivated herbaceous perennial flowering plants belonging to the Asteraceae family. Every year, many varieties are being added by the government and private agencies. Therefore, there is a wide range of variation, but very little attention has been given to its improvement. For effective selection, it is necessary to separate genetic variability from total variability, which will help breeders adopt suitable breeding programmes. There is a need for the identification of varieties suitable for growing in different agroclimatic conditions for specific purposes. Fifty genotypes of chrysanthemum were evaluated in a randomized complete block design during the year 2022 (Kharif) to determine genetic variability, heritability and genetic advance for different quantitative and qualitative traits. Analysis of variance revealed significant differences among genotypes for all the characteristics studied. The results revealed that the magnitude of the phenotypic coefficient of variation (PCV) was greater than that of the genotypic coefficient of variation (GCV) for all the traits, viz., the number of primary branches, number of secondary branches, duration of flowering, number of flowers per plant, weight of one hundred flowers, yield per plant, flower diameter, total number of ray florets per flower head, petiole length, shelf life and disc diameter, indicating genotype and environment interactions. Highest heritability coupled with genetic advance as a percentage mean was found for all the traits. The characteristics associated with high heritability with high genetic advancement as a percentage of the mean may be used as selection criteria in the genetic improvement of yield. Based on the analysis of genotypic and phenotypic correlations and path coefficients, it is suggested that an ideal Chrysanthemum genotype for achieving higher flower yield per plant should possess the following characteristics: increased plant height, longer petiole length, higher weight of 100 flowers and a greater number of flowers per plant. Therefore, selection based on these attributes would result in genetic advances in flower yield per plant.