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Gene Effects and Heterosis in Countrybean (lablab Purpureus (l.) Sweet)

M. W. Mia
Department of Genetics and Plant Breeding Institute of Postgraduate Studies in Agriculture, Salna, Gazipur

M. A. K. Mian
Department of Genetics and Plant Breeding Institute of Postgraduate Studies in Agriculture, Salna, Gazipur

A. R. Chowdhury
Department of Genetics and Plant Breeding Institute of Postgraduate Studies in Agriculture, Salna, Gazipur

M. AIi
Department of Genetics and Plant Breeding Institute of Postgraduate Studies in Agriculture, Salna, Gazipur

T. Hossain
Department of Genetics and Plant Breeding Institute of Postgraduate Studies in Agriculture, Salna, Gazipur

Kh. Saifuddin
Department of Genetics and Plant Breeding Institute of Postgraduate Studies in Agriculture, Salna, Gazipur

Abstract/ Executive Summary:

Gene effects and heterosis were estimated through the study of generation means in countrybean. The mean values of different generations revealed that late flowering, longer pod length and wider pod breadth were partially dominant over early flowering, shorter pod length, and narrower pod breath, while protein content was dominant over lower estimates of the character. The three parameter model failed to account for the variation in generation means in all the characters. Six parameter model indicated that additive type of gene effect was important for earliness, pod length and pod breadth. However, epistatic interactions were indicated for pod length and pod breadth. Additive, dominance effects and epistasis were found for protein content of which dominance gene effect was predominant. Days to flowering showed significant positive heterosis along with negligible inbreeding depression in F₂. But negative heterosis was observed for pod size and protein content. Pod breadth showed significant inbreeding depression.

Keywords: Countrybean, heterosis, Epistasis

Location: Gazipur

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Country bean

Objectives:

Therefore,the present investigation was undertaken to estimate the gene effects and heterosis of some characters in countrybean.

Methodology:

The materials used in the study were two pure lines of countrybean (Lablab purpureus (L.) Sweet) of which CB - 002 is a locally adapted photo and thermosensitive cultivar having large pod size and low protein content in green pod and CB -003, an exotic line introduced from Japan, is a photo and thermo insensitive line having small pod size with high protein content in green pod. For estimating gene effects intervarietal crosses between the above two lines were made and other generations like BC₁, BC₂ and F₂ were produced. All the six generations viz, P_I, P₂, F₁ BC₁_,BC₂ and F₂ were grown in a randomized complete block design with three replications at the experimental farm of the Institute of Postgraduate Studies in Agriculture, Gazipur, Bangladesh in 1987. In each replication 5 plants of each parent, 10 plants of F₁ 20 plants of each back cross and 50 plants of F₂ were grown. Data were collected on individual plant basis for days to flowering, pod length and pod breadth. For protein content, 4 plant for each parent, 5 plants for F₁10 plants for each back cross and 30 plants for F₂were randomly selected per replication for collection of pods at the age of 15 days. Pods were dried at 75^OC for 24 hours and ground properly. Total nitrogen analysis was done following Kjeldahl methods and then protein percent was calculated by multiplying total nitrogen with 6.25. The statistical analysis was conducted for generation means and variances as suggested by Mather (1949). Since three parameter model was inadequate the data were subjected to six parameter model as suggested by Hayman (1958) and Jinks and Jones (1958). Heterosis was calculated in increase of F₁ over better parent. Inbreeding depression was calculated from the deviation of F₁ mean over F₂mean.

Source of Information: Bangladesh 1. Plant Breed. Genet., 2(1&2) : 45-48, 1989

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The heterotic response of F₁s over better parent and inbreeding depression of F₂ over F₁ are calculated. The cross showed significant positive heterosis for earliness. But pod length and protein content showed significant negative heterosis over better parent which were undesirable. Protein content showed significant negative heterosis over better parent which again indicated that dominance gene effects played predominant role for controlling this character. It is interesting that the character days to flowering showed significant heterosis over better parent even when h and other non-allelic interaction components were non-significant. Such heterosis probably occurred due to the dispersion of the incomplete dominant genes. Out of five crosses of Lathyrus for protein content, Significant inbreeding depression was found in pod breadth.

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