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Xylem Water Potential and Leaf Chlorophyll Content 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:

Xylem water potential and leaf chlorophyll conetnt of two mungbean genotypes BM 01 and BM 21 were estimated at 0, 50 and 100 mM NaCl solution to clarify differences in salt tolerance. Salt stress decreased the xylem water potential (XWP) in both the genotypes BM 01 and BM 21. At all levels of salinity the genotype BM 01 showed less reduction in XWP than that of BM 21. A linerar, negative relationship observed between salinty levels and relative chlorophyll a, chlorophyll b and chlorophyll (a + b) but posotive relationship existed between salinity levels and cholorophyll a/b and total cholorophyll stabilty. The higher xylem water potential, better osmotic adjustment, less damaged chlorophylls and higher total chlorophyll stability percentage in BM 01 than BM 21 contributed to the higher salt tolerance of the former genotype than BM 21.

Keywords: Xylem water potential, Leaf chlorophyll content, Mungbean genotypes, 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 clarify the reasons for high salt tolerance of BM 01 compared to BM 21 in response to xylem water potential and leaf chlorophyll content.

Methodology:

The experiment was conducted at the Environmental Stress Research Site of the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur. The trial was carried out in a completely randomized design with five replications. Seeds of two mungbean genotypes, BM 01 (tolerant one) and BM 21 (susceptible one), were sown 3rd March 2004 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. NaCl solutions were applied every other day at an increment of 12.5 mM until the respective final concentrations, 0, 50, 75 and 100 mM were attained for each treatment. Xylem water potential was measured using the pressure chamber technique. Chlorophylls were measured on fresh weight basis extracting the leaf samples with 80 % acetone by using Double Beam Spectrophotometer. Different chlorophylls were estimated.

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

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 35,000/

Total Budget (Tk.) : 35,000/

Achievement/Findings:

The higher xylem water potential, better osmotic adjustment, less damaged chlorophylls and higher total chlorophyll stability percentage in BM 01 than BM 21 contributed to the higher salt tolerance of the former genotype than BM 21.

Knowledge Management: Report/Proceedings