Correlations and Genetical Analyses on the Several Characteristics of the Tea Plant at the Stage of Individual Selection (Part 1)

Toyao, Tadayuki; Amma, Shun; Matsushita, Shigeru; Kayumi, Saneyuki

doi:10.5979/cha.1964.22_1

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“…The genotypic variance (σ g 2 ) and phenotypic variance (σ p 2 ) were calculated according to the formula outlined by Syukur and Rosidah (2014) as follow.…”

Section: Estimates Of Variance and Coefficient Of Variation Componentsmentioning

confidence: 99%

“…Keeping in view the importance of tea crop, there is a need for improvement and to develop varieties suitable for agroclimatic conditions of the area. A systematic breeding programme involves several steps such as collection of clones/germplasm, estimation of genetic variability, induction of genetic variability, implementation of selection and development of improved genotypes to be released as commercial variety (Syukur and Rosidah, 2014). Therefore, a thorough knowledge regarding the amount of genetic variability existing for various characters is essential for initiating the crop improvement program.…”

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confidence: 99%

“…The variability available in a genetically diverse population can be separated into heritable and non-heritable component such as phenotypic and genotypic coefficients of variation, heritability and genetic advance on the basis of which selection can effectively be made. Heritability estimates of a character are important for plant breeders as it provides a measure of transmission of characters from parents to their progenies (Poehlman and Sleper, 1995;Syukur and Rosidah, 2014). However, heritability alone only indicates the phenotypic performance and fails to indicate the expected genetic gain in one cycle of selection.…”

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confidence: 99%

“…Genetic advance indicates the degree of the genetic gain obtained in a character from one cycle of selection. Thus high heritability estimates combined with high genetic advance provide the most favorable condition to decide the criteria of selection (Syukur and Rosidah, 2014;Rosmaina et al, 2016). Keeping in view the importance of genetic variability the present study was undertaken with the objectives to assess the magnitude and nature of genetic variability, heritability and genetic advance among 15 clones of tea with respect to various growth attributing traits which could be utilized in crop improvement programme.…”

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Genetic Variability, Heritability, Genetic Advance and Association of Agronomic Traits of Early Flushing Tea (Camellia sinensis L) Clones at the Nursery Stage

Ahmad¹,

Khan²,

Hamid³

et al. 2021

PJAR

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T ea (Camellia sinensis L.) is one of the important healthy beverages used globally and being cultivated in more than thirty countries in different tropical and subtropical zones of the World (Adnan et al., 2013) having above eighty two genetically distinct species (Sultana et al., 2008). Tea cultivation contributes manifolds in improving the economy and job opportunities status in various Asian and African Abstract | The present study was conducted at the tea nursery farm of PARC-National Tea and High Value Crops Research Institute, Shinkiari, Mansehra, Pakistan during the years 2014-16 to assess genetic variability, heritability and genetic advance as percent of mean for various growth attributing traits of fifteen early flushing tea (Camellia sinensis L) clones. The experiment was laid out in randomized complete block design (RCBD) with three replication and 100 plants per replication. Data were recorded on plant height (PH), number of branches per plant (NBP), number of leaves per plant (NLP), stem diameter (SD), main root length (MRL), root diameter (RD), number of lateral roots per plant (NLRP), dry shoot weight (DRW) and dry root weight (DRW). The highest plant height (78.66 cm) was produced by clone BP 2 -2, followed by Clones BP 1 -4, BP 1 -3, BP 3 -1 and BP 2 -5 with plant height of 70.46, 67.60, 67.20 and 66.36 cm respectively. Clone BP 2 -2 also produced highest number of leaves per plant (34.66), stem diameter (6.53 mm), root length (35.10 cm), root diameter (6.55 mm), number of lateral roots per plant (6.35), Dry shoot weight (17.56 g) and dry root weight (11.57 g). Number of branches per plant in the early flushing tea clones ranged from 1.33 (BP 2 -4) to 6.00 (BP 6 -1 ). The phenotypic coefficient of variation (PCV) was higher than genotypic coefficient of variation (GCV), but the difference between PCV and GCV was minimal for most of the traits revealing little influence of the environment in the expression of these traits.

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“…The genotypic variance (σ g 2 ) and phenotypic variance (σ p 2 ) were calculated according to the formula outlined by Syukur and Rosidah (2014) as follow.…”

Section: Estimates Of Variance and Coefficient Of Variation Componentsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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