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Combining Ability for Flower and Pod Characters of Lablab Bean Under Two Sowing Environments

M.M. Alam
Department of Genetics and Plant Breeding, Patuakhali Science and Technology University, Dumki, Patuakhal, Bangladesh.

M.A. Newaz
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

A study on eight flower and pod characters of Lablab bean (Lablab purpureus) was conducted in a 6X6 F₂ diallel population grown under two sowing dates, July 1, 2000 (S₁) and August 14, 2000 (S₂). Combining ability studies revealed that both additive and non-additive gene actions controlled the expression of all the characters in both sowings. The parent DSN26 was found to be best general combiner for most of the characters irrespective of sowing dates. KBS2 and KBS3 expressed as good general combiners for early flowering and pod formation in both S₁ and S₂ conditions. In both sowing dates, DS 161 was a good general combiner for flower and pod formation and DS30 for pod length. The F₂progeny of DS52 x DS161 was the best specific combiner for early flowering in both sowings followed by DS30 x DSN26. Considering the stability of the F₂genotypes in different sowing dates and their SCA effects, DS30 x DS52 was identified as a promising genotype for inflorescence formation and pod yield. For the rate of pod setting DSN26 x KBS3 was the best specific combiner in both sowings. Significant different results were also found for both GCA and SCA effects due the influence of sowing dates on the genotypes.

Keywords: Lablab bean, Diallel, GCA (General Combining Ability), SCA (Specific Combining Ability)

Location: Genetics and Plant Breeding field laboratory of Bangladesh Agricultural University

Start Date: 01-07-2000

End Date: 14-08-2000

Program Area: Crop-Soil-Water Management

Commodity: Lablab bean

Objectives:

To identify superior parents and their F₂’s for eight flower and pod characters of Lablab bean using 6 X 6 diallel population planted in two different sowing dates.

Methodology:

The study was conducted in a 6x6 F₂ diallel population of Lablab bean (Lablab purpureus) grown under two sowing dates, 1 July 2000 (S₁) and 14 August 2000 (S₂) in the Genetics and Plant Breeding field laboratory of Bangladesh Agricultural University. The genotypes used in the study were DS30, DS52, DSN26, KBS3, DS161 and KBS2 and their 15 F₂ progenies derived from half diallel cross. The experiment was set up in a Randomized Complete Block Design with four replications in each sowing date. Going on with the experiment, pits were prepared with 2 x 2 m spacing about a week ahead of sowing. The size of each pit was approximately 30 x 30 x 30 cm. Three seeds were sown per pit. When the seedling became a month old, they were thinned out keeping only one healthy plant in each pit. Climbing support for each plant had been provided by using single bamboo pole with untrimmed side branches. All the intercultural operations were done as and when necessary. Harvesting of green edible pods was started in the first week of January, 2002 and continued up to the last week of March, 2002. Data were recorded on eight flower and pod characters such as days to first flowering, flowers per inflorescence, inflorescence per plant, pods per inflorescence, pod length (cm), 10-green pod weight (g), rate of pod setting (%) and pod yield per plant (kg). Griffing’s methods model 1 (Fixed effect model) was used for combining ability analysis for each of the trait. In model 1 the experimental material is deliberately chosen and regarded as the population about which inferences are to be made; the general objectives are to compare combining abilities of the parents and using parents as testers, to identify better cross combinations.

Source of Information: Asian Journal of Plant Sciences, 4 (6): 603-607, 2005 (ISSN 1682-3974)

Article Link (Online Journal): http://scialert.net/fulltext/?doi=ajps.2005.603.607&org=11

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Genotype expressions of the F₂’s were also found to be different in different sowing dates indicating the presence of genotype-environment interaction. Thus, before going on with the selection of suitable advanced generation plant breeders should also think about stable genotypes in different environments.

Knowledge Management: Journal