STUDIES ON GENETIC VARIABILITY IN MARIGOLD (Tagetes spp.)
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Date
2021-10-28
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Banda University of Agriculture & Technology, Banda-210001, Uttar Pradesh, India
Abstract
The present investigation was carried out at the Instructional Farm of Department of
Floriculture and Landscape Architecture, College of Horticulture, Banda University of Agriculture
and Technology Banda during 2020-21 to study the variability studies in marigold (Tagetes spp.).
The experiment was laid out in Randomized Block Design with three replications. Sixteen
genotypes of marigold were evaluated for eighteen vegetative, flowering and yield related traits to
study the genetic parameters such variability, heritability, coefficient of variation, correlation and
path coefficient analysis. Analysis of variance for all the traits showed significant differences
among genotypes. High range in mean performance was observed for plant height (5.40-21.62 cm),
inter-nodal length (2.20-6.97 cm), number of primary branches per plant (3.96-19.54), number of
secondary branches plant (11.37-78.50), days taken to first flowering (43.21-86.33 days), flowering
duration (42.46-59.08 days), flower diameter (35.58-74.83 mm), fresh flower weight (1.19-11.55
g), number of flowers per plant (16.71-113.75), flower yield per plant (22.0-367.30 g) and seed
yield per plant (10.60-69.10 g). High coefficient of variation was observed for dry flower weight,
fresh flower weight and leaf area. High heritability was observed for shelf life (99.96%), number of
leaves per plant (99.91%), number of petals per flowers (99.87%), fresh flower weight (99.79%),
leaf area (99.65%) and plant height (99.46%). High Values of genetic advance as per cent of mean
was recorded for dry flower weight (150.99%), fresh flower weight (144.13%), leaf area
(136.71%), number of petals per flower (136.63%), seed yield per plant (124.65%), number of
secondary branches per plant (115.51%) and number of flowers per plant (113.96%). The
magnitude of correlation coefficient at genotypic level was found higher than the corresponding
correlation at phenotypic level. Flower yield per plant had a positive and highly significant
correlation both at genotypic and phenotypic levels with fresh flower weight (0.828, 0.818),
number of petals per flower (0.816, 0.805), shelf life of flower (0.753, 0.739), dry flower weight
(0.717, 0.709 ), flower diameter (0.717, 693) and flower duration (0.707, 0.665). Path coefficient
analysis revealed that fresh flower weight (1.751, 1.649) exhibited maximum positive and direct
effect on flower yield per plant at genotypic and phenotypic level followed by seed yield per plant
(0.509, 0.477), days taken to first flowering (0.364, 0.266), number of primary branches per plant
(0.272, 0.244), dry flower weight (0.271, 0.199), number of flowers per plant (0.263, 0.288) and
shelf life (0.183, 0.182) respectively. Hence selections of these traits would be effective for flower
yield improvement in marigold. The clustering pattern based on Mahalanobis D2
statistic indicated
the existence of wide genetic divergence among genotypes for various traits studied and
categorized the genotypes into five distinct clusters. The highest inter-cluster distance was
observed between cluster-I and cluster-IV (12786.63) whereas the lowest was found between
cluster-II and cluster V (2307.83).
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Citation
Rohit Gangwar 2021. STUDIES ON GENETIC VARIABILITY IN MARIGOLD (Tagetes spp.). M.Sc. Thesis. 98p.