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Growth and Dry Matter Production of Two Mungbean Genotypes at Different Growth Stages in Response to Salinity Tolerance

MD. ABDUL AZIZ
SSO
Agronomy, Division, BARI, Gazipur

M. A. Karim
Professor
BSMRAU, Salna, Gazipur

Abstract/ Executive Summary:

The experiment was conducted to clarify the tolerance of mungbean to salinity at various growth stages. The experimental was carried out in a completely randomized design with five replications comprising two varieties mungbean viz., BM 01 (tolerant one) and BM 21(susceptible one); three salinity treatments viz., 0, 100 and 200 mM NaCl imposed at three different growth stages viz. vegetative, flowering and pod-filling stage.All plants of BM 21 receiving 200 mM died within 10 and 15 days of salinization at the vegetative and flowering stages, respectively, but not at pod filling stage indicating that with the advances in the growth stage the tolerance of the plants to salinity might have increased. The salt tolerance in mungbean increases with the advancement of growth stage. The relative reduction of TDM was higher at vegetative stage than that at flowering and pod-filling stage, especially in BM 21. Between the two genotypes BM 01 showed greater salt tolerance than BM 21.

Keywords: Salt tolerance, Mungbean, Growth stages, NaCl salinity, Dry matter production

Location: BSMRAU, Salna, Gazipur

Start Date: 15-05-1999

End Date: 25-07-1999

Program Area: Variety and Species

Commodity: Mungbean

Objectives:

To clarify the tolerance of mungbean to salinity at various growth stages in terms of growth and dry matter production.

Methodology:

The experiment was conducted at the Environmental Stress Research Site of the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur. The experimental was carried out in a completely randomized design with five replications comprising two varieties mungbean viz., BM 01 (tolerant one) and BM 21(susceptible one); three salinity treatments viz., 0, 100 and 200 mM NaCl imposed at three different growth stages viz. vegetative, flowering and pod-filling stage. Seeds of mungbean genotypes BM 01 and BM 21 were sown on 8 March 2000 in earthen pots of 24 cm in diameter and 30 cm in height. Each pot was filled with 12 kg air-dried soil and kept in venylhouse. Compost (1/4th of the soil volume) and 0.27, 0.28 , and 0.20 g urea, TSP and MP per pot, respectively were incorporated uniformly into the soil. Before application of such high concentrations of saline water, the plants were irrigated with a 25 mM and then a 50 mM NaCl solution for 5 days in order to protect the plants from osmotic shock. Treatment solutions were applied in excess so that the extra solutions dripped out through the bottom of the pots. Treatments at each stage were continued for 10 days, after which the pots were flushed with tap water to leach out the accumulated salt and the plants were irrigated with tap water until plant sampling. Control plants were irrigated with tap water only. Five plants per treatment were harvested at the end of salinity treatment at each stage to measure their dry weight. The data were analyzed by ' MSTAT' program and the treatment means were compared by LSD.

Source of Information: Ph.D Thesis, BSMRAU, Salna, Gazipur

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) : 25000

Achievement/Findings:

The salt tolerance in mungbean increases with the advancement of growth stage. The relative reduction of TDM was higher at vegetative stage than that at flowering and pod-filling stage, especially in BM 21. Between the two genotypes BM 01 showed greater salt tolerance than BM 21.

Knowledge Management: Report/Proceedings