Genetic variability, correlation and path analysis in ginger (Zingiber officinale Rosc.) genotypes

Genetic variability, correlation and path analysis in ginger (Zingiber officinale Rosc.) genotypes

Authors

  • T. Anargha College of Agriculture, Kerala Agricultural University, Thiruvananthapuram 695 522, Kerala, India
  • G. S. Sreekala College of Agriculture, Kerala Agricultural University, Thiruvananthapuram 695 522, Kerala, India
  • Deepa S. Nair College of Agriculture, Kerala Agricultural University, Thiruvananthapuram 695 522, Kerala, India
  • Mareen Abraham College of Agriculture, Kerala Agricultural University, Thiruvananthapuram 695 522, Kerala, India

Abstract

A study was conducted to assess the variability of ginger genotypes in the Western Ghat regions of Kerala. Twenty ginger genotypes were collected and raised in randomized block design with four replications in the College of Agriculture, Vellayani during May 2018 to January 2019. Morphological parameters like plant height, number of tillers, leaf length, leaf breadth, leaf area, rhizome spread, rhizome thickness, yield parameters like fresh and dry rhizome yield, and quality parameters like starch, crude fibre, essential oil, oleoresin and total phenol content were evaluated. Genetic variability, heritability, genetic advance, correlation, path analysis and selection index were also assessed. All the genotypes showed significant variation for the quantitative traits. The ginger genotypes evaluated revealed higher fresh rhizome yield for T11 (Kazhakootam) followed by T15 (Nedumkandam) which produced 65.27 and 20.87 percentage increase in fresh rhizome yield over control. T12 (Irinjalakkuda) genotype recorded higher quality parameters such as starch (6.5% increase) and oleoresin (140 % increase) over the control suggesting the suitability of the genotype for processing. Based on selection index, ranking was done and genotypes T11 (Kazhakootam), T12 (Irinjalakkuda) and T15 (Nedumkandam) were found superior. High genotypic and phenotypic coefficient of variation, heritability and genetic advance were observed for fresh rhizome yield, oleoresin, crude fibre, total phenol and essential oil. High heritability coupled with moderate genetic advance was noted for plant height, rhizome spread, starch and number of tillers. Genotypic correlation coefficients revealed that fresh rhizome yield was positively and significantly correlated with rhizome thickness, number of tillers, rhizome spread, plant height, leaf area, oleoresin and leaf length, while leaf area, number of tillers, rhizome spread, rhizome thickness and oleoresin had positive direct effect on yield. Hence, characters such as rhizome spread and number of tillers with high heritability coupled with moderate genetic advance, and oleoresin with high heritability and high genetic advance were found superior and these traits could be used for effective selection.

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Published

18-01-2021

How to Cite

Anargha, T., Sreekala, G. S., Nair, D. S., & Abraham, M. (2021). Genetic variability, correlation and path analysis in ginger (Zingiber officinale Rosc.) genotypes. Journal of Tropical Agriculture, 58(2). Retrieved from https://jtropag.kau.in/index.php/ojs2/article/view/920

Issue

Vol. 58 No. 2 (2020)

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Articles

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