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Leaf Growth and Gas Exchange Characteristics at Different Photo Flux Density of Tow Mungbean Genotypes Differing in Salt Tolerance

Md. Abdul Aziz
SSO
Agronomy Division, BARI, Gazipur

M. A.Karim
Professor
BSMRAU, Salna, Gazipur

Abstract/ Executive Summary:

The salt tolerance of two mungbean genotypes in response to leaf growth and gas exchange characteristics was evaluated at different photon flux density. Salinity reduced the growth of leaves in both genotypes and the reduction was higher in BM 21 than that in BM 01. The differences in photosynthesis (Pn) between the control and salt affected plants became wider with the increase in photon flux density (PFD) in both the genotypes but the differences were higher in BM 21 than that of BM 01. The increase in soil salinity significantly decreased the stomata conductance (gs) of leaves but salt treated plants of BM 01 showed higher gs than that of BM 21. Salinity increased the intercellular CO₂ concentration (Ci) in both the genotypes. The differences in the Ci between the control and salt stressed plants of BM 21 were sharpened at and above PFDs of 200 mol m^-2 s^-1. As BM 01 showed high tolerance, a comprehensive breeding program should be of value for the improvement of salt tolerance of existing released mungbean variety, which has an increasing demand in the coastal area.

Keywords: Leaf growth, Gas exchange characteristics, Photo flux density, Mungbean, Salt tolerance

Location: BSMRAU, Salna, Gazipur

Start Date: 25-04-2001

End Date: 15-07-2001

Program Area: Variety and Species

Commodity: Mungbean

Objectives:

To find out the effect of salinity on growth and photosynthetic activity of two mungbean genotypes differing in salinity tolerance.

Methodology:

The experiment was conducted at the Environmental Stress Research site of the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during Kharif season of 2003. 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 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.

Source of Information: J. Patuakhali Sci. and Tech. Univ. 1(1): 65-72

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 50000

Total Budget (Tk.) : 50000

Achievement/Findings:

The results indicated that BM 01 is more salt tolerant than the other genotypes.The leaf growth reduction of BM 21 as associated with salt stress is likely to be a consequence of a number of differing effects of salt on plant processes, including effects on photosynthetic performance. As BM 01 in general showed high tolerance, a comprehensive breeding program should be of value for the improvement of salt tolerance of existing released mungbean variety which has an increasing demand in the coastal area.

Knowledge Management: Journal