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Succulence and Ion Compartmentation in Individual Leaves of Two Mungbean Genotypes Differing in Salt Tolerance

Md. Abdul Aziz
SSO
Agronomy Division, BARI, Gazipur

M.A.Karim
Professor
BSMRAU, Salna, Gazipur

Abstract/ Executive Summary:

Physiological response of salt stress was studied in two mungbean genotypes grown at 0, 50, and 100 mM NaCl solutions. The increase in succulence was higher in BM 01 than in BM 21 due to salt stress. The main feature of the tolerant genotype BM 01 was a lower accumulation of Na⁺ in leaves and an apparent capacity for K⁺ redistribution to younger leaves. The genotype BM 01, with low K⁺ concentration in older leaves, showed adequate K⁺ concentration in younger leaves suggesting an efficient retranslocating system. The K⁺: Na⁺ ratio was also higher in BM 01 than that of BM 21.

Keywords: Succulence, Ion compartmentation, Leaves, Mungbean, Salt tolerance

Location: BSMRAU, Salna, Gazipur

Start Date: 12-03-1999

End Date: 20-04-1999

Program Area: Variety and Species

Commodity: Mungbean

Objectives:

To investigate clarification of the salt tolerance mechanism in mungbean genotypes BM 01 and BM 21, which differ in their salinity tolerance.

Methodology:

Seeds of two Mungbean genotypes, BM 01 (tolerant one) and BM 21 (susceptible one), were sown in earthen pots in the vinylhouse. Each pot was filled with 12 kg air-dried soil. Compost (1/4th of the soil volume) and 0.27- 0.28 - 0.20 g urea, TSP and MP, respectively per pot were incorporated uniformly into the soil. The pots were irrigated with tap water until the seedlings were well established. After seedling establishment tap water in control group and 12.5 mM NaCl solution were applied in salt-treated groups up to three days and 25 mM for the next three days for hardening of seedlings before applying actual treatments. When the trifoliate appeared i.e. ten days after emergence (DAE) required amount of respective salt solutions (50 and 100 mM) were applied in 25 pots per treatments. The salt solutions were applied till harvest. Leaf area measurements were performed with a leaf area meter (Delta-T Devices Ltd.,Cambridge, England). From fresh and dry weight measurements, water contents (in g H₂O g dry weight^-1) were obtained. Succulence was calculated as the ratio between water content per leaf and leaf area . Xylem water potential was measured using the pressure chamber technique (Turner, 1988). At harvest the plants were separated into individual leaves, stems and roots and weighed. Roots were washed thoroughly in tap water and blotted dry before weighing. All plant parts were dried at 70⁰C to a constant weight. Oven dried leaves, stems and root were ground with a Willey grinding machine (cap/small 1029-8, Yoshida Seisakusho Co. Ltd.). Na⁺ and K⁺ were extracted from samples with hot water and determined using a flame photometer (EEL, Essex, England). All the data were taken at 33 days after sowing i.e., before flower initiation of the crop.

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

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 30,000/-

Total Budget (Tk.) : 30,000/-

Achievement/Findings:

The genotype BM 01, with low K+ concentration in older leaves, showed adequate K⁺concentration in younger leaves suggesting an efficient retranslocating system. The K⁺: Na⁺ ratio was also higher in BM 01 than that of BM 21.The genotype BM 01 showed more salt tolerant than BM 21.

Knowledge Management: Report/Proceedings