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Respiration, Quantum Yield of Photosynthesis and Transpiration 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:

The mechanism of salt tolerance in relation to individual leaf growth, transpiration, dark respiration rates, and quantum yield was studied at 0, 50 and 100 mM NaCl solutions. At the high salt concentration all the leaves of BM 21 showed consequently higher reduction in growth than those of BM 01. The relative reduction (% of control) of Tr and dr were least in BM 01 than in BM 21. The dark respiration rates were less than 1 µmol (CO₂) m^-2 s^-1 and accounted for 19 and 32% increase (% of control) at the highest PFD in BM 01, while it was 31 and 44% in BM 21, respectively at 50 and 100 mM NaCl. More reduced quantum yield in BM 21 than BM 01 reflects more maintenance costs of energy in repairing injured tissue, enzyme reactions and ion movement.

Keywords: Salt tolerance, Mngbean, Respiration, Quqntum yield, Transpiration

Location: BSMRAU, Salna, Gazipur

Start Date: 02-07-2000

End Date: 17-08-2000

Program Area: Variety and Species

Commodity: Mungbean

Objectives:

To compare the effects of NaCl salinity on the components of carbon accumulation in two mungbean genotypes BM 01 and BM 21 which differ in their salinity tolerance: dark respiration, quantum yield, transpiration rate and and the extension growth of individual leaves.

Methodology:

Mungbean seeds of two genotypes, 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.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. Dark respiration (O µmol m^-2 s-¹) was measured using a portable photosynthesis system (LICOR-6200) assembled with an infra Red Gas Analyzer (IRGA) and data logger following the procedure described by Kubota and Hamid (1992)

Source of Information: Pak. J. Sci. Ind. Res. 51(5) 276-280

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) : 30000

Achievement/Findings:

More reduced quantum yield in BM 21 than BM 01 reflects more maintenance costs of energy in repairing injured tissue, enzyme reactions and ion movement.

Knowledge Management: Journal