Genetic variance and heritability estimation of hybridized pepper plants (Capsicum annuum L.) F2 progeny for begomovirus resistance in growth stage

Abstract

Pepper is widely cultivated as a condiment and cash crop in Indonesia. However, Pepper yellow leaf curl disease (PepYLCD) caused by begomovirus is currently seriously affect the domestic pepper production. Breeding for begomovirus resistance material by crossing is currently necessary to overcome the constraint. The present study is aimed to determine the resistance of pepper (C. annuum) plants F2 progenies to begomovirus infection in the growth stage. Two local C. annuum accessions, BaPep-5 as a resistance donor for pepy-1 begomovirus resistance gene (locally called Perintis) and BaPep-4 as a susceptible parent (locally called Kencana) were crossed to generate F2 progenies. The research was conducted in Agricultural Extension Training Centre (BLPP) Saree and Horticulture Laboratory of Syiah Kuala University from February to July 2020. 500 F2 progenies were transplanted to the field along with 15 plants of each parent as control. The result suggested that plant height and crown width had the highest broad sense heritability value, whereas the dichotomous height, stem diameter, secondary branch, and tertiary branch had the lowest broad sense heritability value. Coefficient of genetic variance and coefficient of phenotypic variance from overall characteristics were relatively low which suggest the narrow sense to slightly narrow sense heritability.

Selection criteria for lowland tomatoes (Solanum lycopersicum L.)

“…The height criteria are indicated by the estimated broad-sense heritability values for vegetative characters such as stem diameter, plant height, and crown width. The same results were reported for stem diameter [11], plant height [12], and crown width [13].…”

Variation in Shoot, Peduncle and Fruit Growth of Lagenaria siceraria Landraces

“…The phenotypic, genotypic and environmental variances and coefficient of variation were calculated according to the formula described by [ 61 ] and cited by [ 18 ], as follows: Environmental variance (δ 2 e) = MSE Phenotypic variance (δ 2 p) = δ 2 g + δ 2 e where MSG is the mean square due to genotype; MSE is the mean square of error (environmental variance); and (r) is the number of replications. where…”

“…Genetic parameters such as phenotypic and genotypic coefficients are used to measure the variation among different genotypes [ 17 ]. The phenotypic display of a plant is bound to the genetic value, environment, and interaction of both factors [ 18 ]. Heritability measures the impact of the genetic makeup on the expression of a desired attribute [ 17 ].…”

“…Heritability measures the impact of the genetic makeup on the expression of a desired attribute [ 17 ]. A heritability estimate also determines the selection, such that it displays the quantifiable representation of a trait due to genetics or the environment that can be further utilized in crop advancements such as hybridization [ 18 ]. Crop advancement greatly depends on the amount of genetic variability that is present and how much of it is heritable [ 19 ].…”

“…Crop advancement greatly depends on the amount of genetic variability that is present and how much of it is heritable [ 19 ]. A heritability estimate close to 100% suggests a stronger influence that genetics has on expressed attributes among different germplasms, whereas an estimate closer to 0% suggests that most of the variation is not driven by genetics [ 18 , 19 ]. Furthermore, broad-sense heritability measures the phenotypic diversity due to genotypic values that may result from dominance and epistatic gene action [ 19 ].…”