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Genotypic Differences in Growth and Ions Accumulation in Soybean Under Nacl Salinity and Water Stress Conditions

M. S. A. Khan
Agronomy Division, BARI

M. A. Karim
Department of Agronomy, BSMRAU

M. M. Haque
Department of Agronomy, BSMRAU

Abstract/ Executive Summary:

Salt and water stress tolerance of the seven soybean genotypes viz. BARI Soybean 6, BD 2329, BD 2342, AGS 95, BGH 02026, Galarsum and BD 2331 were evaluated for their performance at 0 and 100 mM NaCl under well watered & water stress (watering with 70% depletion of available water at wilting) conditions at the Banghabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur. The results indicated that all the growth parameters like plant height, shoot dry weight, root dry weight and dry matter distribution in different plant parts of the genotypes sharply decreased when the plants were exposed to water stress, salt stress and, combined salt and water stress conditions. Among the genotypes reduction in dry matter production was the least in Galarsum and BD 2331 in both the salt stress and, the combined salt and water stress conditions. These genotypes also accumulated lower amount of Na+ and higher amount of K+ in leaf tissues under salt stress and, combined salt and water stress environments as compared to others.

Keywords: Soyabean, Salt and water stress, Dry matter production, Ions accumulation

Location: BSMRAU research farm, Salna, Gazipur

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Soybean

Objectives:

To analyze the growth and mineral ions accumulation pattern in some soybean genotypes.

Methodology:

The experiment was conducted in a plastic house of the Department of Agronomy at Banghabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur, Bangladesh. Seven genotypes (BARI Soybean 6, BD 2329, BD 2342, AGS 95, BGH 02026, Galarsum and BD 2331) of soybean including BARISoybean 6 were used for testing their salt and water stress tolerance. Selected genotypes were denoted as moderately salt tolerant (Khan, 2013). Seeds were washed several times in the tap water for surface cleaning then sown in the soil medium on January 13, 2011 in plastic pots having 30 cm in height and 24 cm inner diameter. Each pot contained 12 kg air dried sandy loam soil. Chemical fertilizers of 0.30 g urea, 0.90 g TSP, 0.60 g MOP and 0.60 g Gypsum per pot were also incorporated into the soil before sowing. The pots were watered daily for easy germination. After the emergence and establishment, three uniform healthy seedlings per pot were allowed to grow for three weeks (21 DAE) in equal environment. After three weeks of emergence, all the genotypes were divided into 6 groups. The treatment groups were; Control (T₁), water shortage (irrigated with 70% depletion of available soil water when wilting sign developed) from 21 DAE (T₂), 50 mM NaCl irrigated from 21 DAE (T₃), 50 mM NaCl irrigated from 21 DAE + water shortage from 35 DAE (T₄), 100 mM NaCl irrigated from 21 DAE DAE (T₅) and 100 mM NaCl + water shortage from 35 DAE (T₆). The control groups of plants were irrigated with tap water only. The experiment was arranged in two factors Completely Randomized Design (CRD) with 8 replications. Plant samples were collected in 42 DAE and different plant parts were separated and then oven dried at 70ºC for 4 days to measure the dry weight. Dried leaves were finely ground and the samples were dry-ashed at 500ºC for 8 hours and then digested with concentrated hydrochloric acid. Na and K concentrations were determined by a Flame Spectrophotometer. Data were analyzed by MSTAT-C program and the treatment means were compared by using Least Significant Difference (LSD)

Source of Information: Bangladesh Agron. J. 2014, 17(1): 47-58

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of this study indicated that all the growth characters of the soybean genotypes sharply decreased when plants were exposed to water stress, salt stress and, combined salt and water stress conditions. Variation in salt and water stress tolerance of soybean genotypes was obvious. Among the genotypes, reduction in dry matter production was least in Galarsum and BD 2331 in both salt and, combined salt and water stress conditions. These genotypes also accumulated lower amount of Na and higher amount of K in leaf tissues under the salt stress and, the combined salt and water stress environments as compared to others.

Knowledge Management: Journal