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Combining Ability Analysis in Hyacinth Bean [lablab Purpureus (l.) Sweet]

M. S. Islam
Horticulture Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

M. M. Rahman
Bangabandhu Sheikh Mujibar Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh.

M. A. K. Mian
Bangabandhu Sheikh Mujibar Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh.

Abstract/ Executive Summary:

The nature and magnitude of generations of five genotypes of hyacinth bean [Lablab purpureus (L.) Sweet] were studied in a full diallel to estimate combining ability effects during winter season of 2005/2006 at Bangabandhu Sheikh Mujibar Rahman Agricultural University (BSMRAU), Gazipur. Combining ability studies of full diallel crosses revealed that the variances due to GCA and SCA were highly significant for all the characters which indicated the importance of both additive and non additive gene actions. However, GCA variances were higher than the SCA variances for most of the characters signifying a predominant role of additive gene action. In addition, all the characters showed reciprocal effects indicating the role of maternal cytoplasm on the differences of the hybrid performance. The parents P₁ and P₂ were the good general combiner for earliness; P₃ for number of pods per plant, individual pod weight, pod length and number of seeds per pod while P₄ for pod breadth and 100-green seed weight. The combinations P₁ × P₂ exhibited higher significant SCA effects for, number of pods per plant, pod yield per plant, 100-green seed weight indicating promising cross for higher production.

Keywords: Combining ability, GCA, Hyacinth bean, SCA

Location: BSMRAU, Gazipur.

Start Date: 01-07-2005

End Date: 28-02-2007

Program Area: Crop-Soil-Water Management

Commodity: Hyacinth bean

Objectives:

To determine GCA and SCA of the selected parents of hyacinth bean.

Methodology:

The study was carried out at the experimental farm of BSMRAU, Gazipur during July 2005 to February 2007. Five genotypes of hyacinth bean were selected for this study based on their morphological diversity. Two seeds of each genotypes were sown in a poly bag on July 21, 2005 and ten days old seedlings were transplanted in the field on the raised beds at a spacing of 1.5m × 2.0m. Ten plants of each genotype used for crossing programme. The plants were fertilized with 10 t/ha of cattle manure, Urea 50 kg, Triple Super Phosphate (TSP) 150 kg and Muriate of Potash (MP) 150 kg per hectare of each (Rashid, 1999). One week before transplanting 10 t/ha of cattle manure, TSP and half dose MP were applied as basal dressing during pit preparation. The remaining MP and Urea were applied, as top dressing at 15, 30 and 45 days after transplanting. The parented were crossed as per techniques described by Chowdhury et al. (1989) in full diallel combinations during winter 2005/2006 making 20 cross combinations. On maturity pods (38-40 days after cross pollination) were collected and kept for seven days in the laboratory for seed to mature full and the seeds were then collected and kept in a desiccators for next season evaluation. Seeds Twenty F₁’s and five parental genotypes were sown in a polybags on June 15, 2006 and transplanted in the main field on June 25, 2006 using RCBD with three replicates with five plants in each replicate. The crop was fertilized as mentioned above. Staking of the plants and other cultural operations were done as per Rashid (1999). Observations were made on days to first flower, pods per raceme, pod length, pod breadth, pods per plant, individual pod weight, pod yield per plant and number of seeds per pod, 100-green seed weight. The collected data were subkected to combining ability analysis following Model I and Method I (Full diallel fashion) of Griffing (1956).

Source of Information: SAARC JOURNAL OF AGRICULTURE, Vol. 7, Issue 2, 2009, pp. 106-115, ISSN 1682-8348, SAARC Agricultural Information Centre.

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Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The parents P₁ and P₂ could be used as the best general combiner for earliness; P₃ for number of pods per plant, individual pod weight, pod yield while P₄ for 100-green seed weight. Among the crosses, P₁ × P₂ was the best specific cross for most of the economic traits like earliness, number of pods per plant, individual pod weight and pod yield per plant. Therefore, the combination P₁ × P₂ may be selected for exploitation of heterosis for higher yield of hyacinth bean.

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