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Morpho-metric characterization and genetic variability studies in chrysanthemum

Published online by Cambridge University Press:  08 February 2022

Gunjeet Kumar*
Affiliation:
Division of Floriculture and Landscaping, ICAR-Indian Agricultural Research Institute, New Delhi, India
Varun M. Hiremath
Affiliation:
Division of Floriculture and Landscaping, ICAR-Indian Agricultural Research Institute, New Delhi, India
A. K. Tiwari
Affiliation:
Division of Floriculture and Landscaping, ICAR-Indian Agricultural Research Institute, New Delhi, India
Vanlalruati
Affiliation:
Division of Floriculture and Landscaping, ICAR-Indian Agricultural Research Institute, New Delhi, India
S. S. Sindhu
Affiliation:
Division of Floriculture and Landscaping, ICAR-Indian Agricultural Research Institute, New Delhi, India
*
Author for correspondence: Gunjeet Kumar, E-mail: kumar_gunjeet@yahoo.com

Abstract

Germplasm characterization is essential to estimate variation and identify desirable genotypes for crop improvement. The current study was conducted on eight qualitative and 14 quantitative traits related to growth and floral attributes for characterization and grouping of 54 chrysanthemum genotypes. Wide variability was observed among most of the traits and principal component analysis revealed that the first two principal components explained most of the existing variation (>98%) in germplasm. Genotypic coefficient of variation exhibited a wide range from 9.41% (ratio of leaf length/width) to 105.99% (corolla tube length of ray florets), while phenotypic coefficient of variation varied from 10.49% (ratio of leaf length/width) to 106.38% (corolla tube length of ray florets). Broad sense heritability estimates were higher (>96%) for most of the characters, except for traits such as ratio of leaf length/width and peduncle thickness. Forty-four pair-wise inter-trait combinations showed positive genotypic and phenotypic correlations for 91 possible combinations. D2 analysis revealed that genotypes of clusters I and IV to be highly distinct, and hybridization between them might have better chance to obtain desirable types. D2 analysis confirmed that the cultivars in cluster IV namely, Red D Spoon, Tokyo Soldier, Yellow Reflex and hierarchical clustering showed that the cultivar Tokyo Soldier to be highly diverse. It is recommended to use the above genotypes in crossing programme for obtaining better progenies.

Information

Type
Research Article
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of NIAB

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