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Combining Ability and Its Interaction with Environments in Lablab Bean (lablab Purpureus)

S. Khanam
Bangladesh Institute of Nuclear Agriculture P.O. Box No. 4 Mymensingh

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

M. L. Rahman
Bangladesh Institute of Nuclear Agriculture P.O. Box No. 4 Mymensingh

Abstract/ Executive Summary:

A Six-parent F₂diallel cross without reciprocal, was carried out in two cultural environments: one (env. 1) with fertilizer and early sowing, and the other (env. 2) without added fertilizer but had relatively latter sowing date for eight characters. Combining ability analysis suggested predominant role of additive gene action for inflorescence/plant and pod yield/plant. Whilst pods/inflorescence appeared to be governed by non-additive gene action. Environmental heterogeneity was noticed for several characters including pod yield/plant. Parental genotypes DS52 proved best general combiner and DS167 showed poor combiner for majority of the characters examined. Different cross combinations were best for different parameters.

Keywords: Combining ability, Environmental heterogeneity, Lablab purpureus

Location: Mymensingh

Start Date: 10-07-1995

End Date: 21-04-1996

Program Area: Variety and Species

Commodity: Country bean

Objectives:

To know the gene action for quantitative characters and to identify potential parents/crosses that can be used in the lablab bean improvement program.

Methodology:

Six genotype of lablab bean viz. KBS1, DS52, DS106, DS112, DS161, and DS167 and their 15 F₂ families generated from diallel cross (without reciprocals) were included in the study. Of the parental genotypes DS167 was a short plant type and the remaining five were climbing habit- a feature common to all Bangladesh varieties and land races. Two cultured environments, created by differential sowing dates and fertilizer applications, were to investigate environmental interaction in the study. A RCB design with five blocks, each representing a replication, was used for either of environments. Pits were prepared at a spacing of 2m x 2m, between & within the rows. Three to four seeds for each diallel family, including parent, were sowing per pit. Necessary cultural operations were done as & when required. Data were recorded from all experimental plants on eight characters, such as flowering date, flowers/inflorescence, pods/inflorescence, inflorescence/plant, pod length, pod width, 10-pod weight and pod yield/plant. The combining ability analysis was done according to the method 2,

Source of Information: Bangladesh J. Agril. Sci. 27(2): 243-249, July, 2000

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

These crosses could be utilized for exploiting non additive gene action for pod character in further breeding program. Environment had no effect on flowers/inf lorescence but had on pods/inflorescence in the inheritance of non additive effect. In case of inflorescence/plant the best parents were DS52 in env. 1 and 08161 in env. 2 followed by DS106 in both the environments. As regard sea effect, KBS1 X DS106 and DS161 were the best cross combinations in env. 1 and env. 2, respectively. The parent combinations of these cross were average x poor and good x good combiner. The importance of DS106 and DS161, which was already, indicated as good general combiner for inflorescence/plant as well. In both environments, DS52 was the best general combiner of pod length, pod width and 10-pod wt. and the cross combination DS161 X 081657 was the best in env. 1 for above characters but in env. 2 KB81 X DS106 (1.372) for pod length, 08106 X 08112 (0.297) for pod width and KB81 X 08161 (10.511) for 10-pod wt. were the best cross combinations. For yield character parents DS52 and 08106 had the maximum gca effect (Table 2) in env. 1 and env. 2, respectively confirming their superiority as the best general combiner. Parent 08167 was poor combiner for both the environments. 0852, 08106 would be performed better for yield in further breeding program. Through parent DS167 was the poor combiner for almost all the characters it would be utilized for its short plant height and earliness. The highest sea effect was obtained in the cross DS106 X 08161 in both environments (Table 3) which was in consistence of average x average general combiner in env. 1 ar.d good x good general combiner in env. 2 for this trait. This hybrid may be utilized in further breeding program especially for pod yield.

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