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Distribution of Na+, Mg+2 and Cl- Ions in Different Plant Parts 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:

Under saline condition roots contained higher amount of Na⁺ than shoot in both the genotypes but the two genotypes showed a different response. The Mg+2 accumulation was a little lower in BM 01 than that in BM 21. Chloride ion increased dramatically with the increasing levels of salinity in both the genotypes. BM 21 accumulated relatively higher content of Cl^- in most of the plant parts. BM 01 expressed more salt tolerance than BM 21 in terms of toxic ion accumulation. The difference in salt tolerance between the two genotypes was associated with the difference in the degree of toxicity of excess accumulation of Na⁺, Mg⁺² and Cl^-to the plant tissue.

Keywords: Physiological mechanisms, Salt tolerance, Mungbean, Na+, Mg+2 and Cl- ion distribution

Location: BSMRAU, Salna, Gazipur

Start Date: 12-03-2000

End Date: 15-05-2000

Program Area: Variety and Species

Commodity: Mungbean

Objectives:

To find out the difference in salt tolerance between these two genotypes related to differences of the toxic accumulation of Na, Cl or Mg in different plant parts.

Methodology:

Seeds of two genotypes of mungbean, BM 01 (tolerant one) and BM 21 (susceptible one), were sown in earthen pots in the vinylhouse at the Environmental Stress Research Site of the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur. 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 per pot were incorporated uniformly into the soil. Six plants were used in each treatment for the measurement of agronomic parameters. The pots were irrigated with tap water until the seedlings were well established. NaCl solutions were applied every other day at an increment of 12.5 mM until the respective final concentrations, 50, 75, and 100 mM were attained for each treatment. The treatment solution was applied with irrigation water until maturity. Plants in the control group were irrigated with tap water. Sampling was done at a ten-day interval from 25 days after emergence (DAE) till maturity. After harvesting, roots were separated from the plants and washed with tap water. The plant parts were segmented into leaf, stem and reproductive organ (flowers + pods). The samples were oven-dried at 70 ⁰C to a constant weight. Sodium and magnesium concentrations from these parts of the plants were determined by atomic absorption spectrophotometer ( Shimadzu, Atomic Absorption /Flame Spectrophometer; Model- AA. 610s) following Hitachi Ltd., (1986). Chloride concentration was estimated following the method described by Jackson (1955). The ground plant materials were dry-ashed in porcelain evaporating dish with calcium oxide in a muffle furnace at 600 ^OC for eight hours. Then the ash sample was extracted with hot water and the chloride was analyzed by titration with standard silver nitrate.

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

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 30000

Total Budget (Tk.) : 30000

Achievement/Findings:

BM 01 and BM 21 showed the different relative tolerance, support the argument that ion effects are responsible for the differences in salt tolerance and it was due to the difference in the degree of toxicity of Na⁺, Mg²⁺ and Cl^-.

Knowledge Management: Report/Proceedings