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

M. A. Aziz
Agronomy Division, BARI, Gazipurl-701, Bangladesh. E-mail: m58abdulaziz@yahoo.com

M.A.Karim
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh.

A. Hamid
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Q.A. Khaliq
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh.

M. K. Hossain
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh.

A.J.M.S. Karim
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh.

Abstract/ Executive Summary:

The salt tolerance of two mungbean genotypes (BM 21 and BM 01) in response to leaf growth and gas exchange characteristics was evaluated at different photon flux density (PFD). Salinity reduced the growth of leaves in both the 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 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 stomatal conduct (gs) of leaves, but salt treated plants of BM 01 showed higher gs than that of BM 21. Salinity increased the intercellular CO₂ concentration (Cj) in both the genotypes. The differences in the C, between the control and salt stressed plants of BM 21 were sharpened at and above PFDs of 200 umol m^-2 S^-I. As BM 0 I showed high tolerance, a comprehensive breeding programme should be of value for the improvement of salt tolerance of existing released mungbean varieties, which have an increasing demand in the coastal area.

Keywords: Gas exchange characters, Leaf growth, Mungbean, Photon flux density, Salt tolerance

Location: BSMRAU

Start Date: 00-00-2003

End Date:

Program Area: Variety and Species

Commodity: Mungbean

Objectives:

This report presents 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 the 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 NaCI solution were applied in salt-treated groups up to three days and 25 mM for the next 3 days for hardening of seedlings before applying actual treatments. When the trifoliate appeared i.e. 10 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 growth rate and leaf area was measured with a portable leaf area meter (Model AAM-7, Hayashi Dehnco Co. Ltd. Tokyo, Japan). Specific leaf area (SLA) for individual leaf was calculated as the dry weight per unit leaf area (Leidi and Saiz, 1997). Photosynthetic rate (P_n₎, stomatal conductance (g₅) and intercellular CO₂concentration (C_i) were 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). The sequences of photon flux density (PFD) in the photosynthetic measurements were: 0, 50, 100,200,500, 1000, 1500 and 2000 !lmol m^-2 s^-1on fully expanded 3^rd trifoliate from the top of the canopy. Each measurement was replicated 3 times following a factorial completely randomized design. The light source was artificial halogen lamp (OSRAM, HQI- TS 150/NDL). For the dark measurements (0 µmol m^-2 s^-1), the leaf chamber was covered with black cloth.

Source of Information: Patuakhali Sci. and Tech. Univ. 2009, 1 (1): 65-72 ISSN 1996-4501

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of the study indicated that BM 01 is more salt tolerant than BM 2l. 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 programme should be of value for the improvement of salt tolerance of existing released mung bean varieties which have an increasing demand in the coastal area

Knowledge Management: Journal