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Evaluation of Mungbean (vigna Radiata (l.) Wilczek) Genotypes on the Basis of Photosynthesis and Dry Matter Accumulation

M. A. HOSSAIN
Soil Resource Development Institute, Mrittika Bhaban, Krishi Khamar Sarak, Dhaka-1215, Bangladesh

A. HAMID
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur-1706, Bangladesh

M. A. KHALIQ
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur-1706, Bangladesh

Abstract/ Executive Summary:

The study was carried out to evaluate six mungbean genotypes on the basis of photosynthesis and productivity under two levels of nitrogen. GK3 was found to have highest photosynthesis rate as well as the highest productivity among the six genotypes followed by VC6144A, PDM54 and IPSA25 irrespective of N levels.

Keywords: Mungbean, Genotypes, Photosynthesis.

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Mungbean

Objectives:

To evaluate the mungbean genotypes from the aspects of photosynthesis and productivity.

Methodology:

The experiment was conducted in the Environmental Stress Research Site, Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University and was laid out in Completely Randomised Design. Six genotypes viz. VC6153B, VC 6144A, GK 3, PDM 54, IPSA25 and VO 1443A-G were the treatment variables for the experiment. The rows were arranged in north-south direction in a polyvinyl shed. The genotypes were raised under two levels of supplied nitrogen (High N - 154mg/l and Low N - 34 mg/l). Hoagland 3 solution: (3.5 mM Ca(NO₃)2, 5 mM KNO₃, 1 mM KH₂PO₄, 0.99 mM MgSO₄, 19 M Fe-citrate and microelements made of 0.154mM N (high N level-HN)) and Hoagland 1 solution: (0.5 mM Ca(NO₃)2, 5 mM K₂SO₄, 0.5 mM Ca(H₂PO₄)2, 2 mM CaSO₄, 0.99 mM MgSO₄, 19 μM Fe₂O₃, and micro-nutrient) made of 0.3414 mM N (low N level-LN) were used as source for nitrogen. The seeds of selected mungbean genotypes were sown on 13 April 2001 in vermiculite filled net bag. The net bag was inserted in the upper portion of 30 cm long perforated polyvinyl chloride (PVC) pipe sections. Three such PVC sections were tied to a triangular shaped bamboo frame so that the PVC sections can suspend in the nutrient solution. The seedlings were transferred in vessels (size- 20 liter) containing nutrient solutions (Hoagland 3 (high N - 154 mg/l) and Hoagland 1 (low N-34 mg/l) at 14 days after emergence (DAE) on 30 April 2001. Plants were supported in the upper portion by bamboo sticks. Some seedlings were replaced as they failed to survive under changed situation. Each vessel containing three seedlings of the concerned genotype was replicated thrice. One of the three plants from each vessel was harvested at 35 DAE i.e. 3 weeks after transferring in nutrient solution. Another was harvested at 49 DAE i.e. 5 weeks after transferring in nutrient solution. The remaining one was kept in the container up to maturity (c. 63 days). The pH of the solution was maintained at 6.5 by adding required amount of 4N H₂SO₄. The nutrient solution was changed twice in a week and was aerated continuously using air pump to maintain sufficient oxygen for root respiration and to provide solution mixing. Photosynthesis was measured at vegetative, flowering, pod filling and maturity stage using fully expanded leaf (the third from the top) with a portable Photosynthesis System (Model: LiCOR-6200) assembled with an Infra Red Gas Analyzer (IRGA) and data logger following the procedure described by Kubota and Hamid (1992). The size of clamp-on assimilation chamber of was kept fixed at 6.25 cm². A metal halide lamp of 150 W was used to obtain a photosynthetic active radiation (PAR) of 1500 μmol m^-2 s^-1 during the measurement. Airflow through the chamber was 400 ml min^-1; relative humidity (RH) of air supplied in the chamber was adjusted to 50% and chamber temperature was maintained at 30^oC ± 1. Photosynthesis data was recorded from 9:30 to 3:00 pm in a steady-state condition after the leaf was placed in the chamber. Net photosynthesis rate (Pn), leaf conductance (Cs), and other related parameters were available as computer output attached to the system. Leaf area was measured by an automatic leaf area meter (Model AAM 8, Hayashi Denko, (Japan).

Source of Information: J Agric Rural Dev 7(1&2), 1-8, June 2009, ISSN 1810-1860

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, GK3 was found to have the highest photosynthesis rate as well as the highest productivity among the six genotypes followed by VC6144A, PDM54 and IPSA25 irrespective of N levels. This genotype may be selected as potential mungbean genotype for commercial cultivation both under low and high N environment.

Knowledge Management: Journal