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Pod Growth and Quality in Indeterminate Vegetable Pigeonpea Morphotypes

M.S.A. Fakir
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. Abdullah
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A study was carried out to investigate the stage of physiological maturity (PM), time of harvest of vegetable pod and nutrients content of green matured seed in four long duration (indeterminate) vegetable pigeonpea (Cajanus cajan (L.) Millsp.) Morphotypes viz., Bogra, IPSA, Jamalpur and Comilla. Maximum seed dry weight or PM was observed around 40 days after anthesis (DAA); while appropriate time of vegetable pod harvest was recorded between 35 and 40 DAA. Differences in protein, reducing sugar, starch and crude fibre content of seed existed in the four Morphotypes at different times of growth indicating a probable genetic variation in these characters. For better seed quality and protein yield, the Morphotype ‘Bogra’ may be recommended as a good vegetable variety. It may be concluded that physiological maturity was attained around 40 DAA and mature green pods may be harvested for consumption as vegetable between 35 and 40 DAA for good nutrients and quality.

Keywords: Physiological maturity, Vegetable pod, Nutrient, Cajanus cajan

Location: Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

Start Date: 00-05-2001

End Date: 00-12-2001

Program Area: Variety and Species

Commodity: Pigeonpea

Objectives:

1. To examine the stage of physiological maturity (PM); 2. To determine the harvesting time for vegetable pod, and 3. To investigate the changes of nutrient content of growing seeds for vegetable purposes in four indeterminate pigeonpea Morphotypes.

Methodology:

Seeds of three long duration (indeterminate) pigeonpea (LDP) Morphotypes were collected from Bogra, Jamalpur, Comilla and were designated as ‘Bogra’, ‘Jamalpur’, and ‘Comilla’ Morphotype, respectively. One released variety from Bangabhudhu Sheik Mujibur Rahman Agriculture University (formerly institute of post graduate studies in Agriculture, IPSA) was named as ‘IPSA’. The field experiment was laid out in randomised complete block design (RCBD) with three replications. The experimental plots were divided into three blocks each representing a replication. Each block was divided into four unit plots where four treatments (4 Morphotypes/ variety) were allotted randomly. Thus, these were 12 (4 x 3) unit plots altogether in the experiment. The size of the plot was 2m x 1m. The blocks were separated by 0.5 m wide drain. The plots were raised up to 15 cm from the soil surface. Five seeds of each of the four indeterminate Morphotypes/ variety of pigeonpea were hand sown on 22 May, 2001 at 5 cm depth using a spacing of 100 cm x 50 cm. Thinning was done at 15 days after sowing (DAS) keeping one healthy seedling in each hill. Standard cultural practices were followed. The experiment was completed by December, 2001. Flowers were tagged with coloured woolen threads at different times so that data on pericarp at 0, 3, 7, 10, 15, 20, 25, 30, 35, 40 and 50 days after anthesis (DAA) were obtained. At each stage, 10 pods were randomly picked up carefully form each replication and were enclosed in polythene bag to avoid loss of water. The collected pods were labelled and brought carefully to the laboratory. The samples were used to record different characters such as pod length (measured from the base to the tip, excluding the pedicel) and pod diameter (average of base, mid and top portion). Freshly harvested pods were shelled and the green seeds were separated out from pericarp. Fresh weight of pericarp and seed, total fresh weight (pericarp plus seed) were obtained for pods at each age. The samples were oven dried at 80°C ± 2 for 48 hours and their corresponding dry weights of the pericarp and seed were recorded. Total nitrogen content of pericarp and seed at different stages of harvest was estimated following the MicroKjeldahl method. Crude fibre content was determined by the method of Food Composition Analysis and that of reducing sugar by the method of Somogyi. Analyses of variance of different data were performed following RCBD with the help of computer package MSTAT. The mean differences were evaluated by least significance difference test.

Source of Information: J. Agrofor. Environ. 1(2): 129-133, 2007; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

For better seed quality and protein yield, the Morphotype ‘Bogra’ may be recommended as a good vegetable variety. It may be concluded that physiological maturity was attained around 40 DAA and mature green pods may be harvested for consumption as vegetable between 35 and 40 DAA for good nutrients and quality.

Knowledge Management: Journal