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Physiological Basis of Water Stress Tolerance in Soybean

K. K. Sarkar
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

M. A. Mannan
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

M. M. Haque
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

J. U. Ahmed
Department of Crop Botany, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706

Abstract/ Executive Summary:

An experiment was conducted to study the effects of water stress on physiological parameters associated to drought tolerance in soybean at the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during January to April, 2015. Four soybean genotypes namely i) BU Soybean 1 ii) Binasoybean 1 iii) Galarsum and iv) BARI Soybean 5 were grown in two watering regimes viz. control (80% of the field capacity) and water stress (50% of the field capacity). Genotypic variability was found in water stress tolerance in soybean. Highest accumulation of leaf proline, sugar and water content and lower accumulation of malondialdehyde were found in Binasoybean 1 compared to other genotypes. Lowest yield reduction was found in Binasoybean 1. Binasoybean 1 showed relatively higher drought tolerance whereas BARI Soybean 5 was found susceptible to yield. It was found that higher water stress tolerance in Binasoybean 1 was associated with better water relations and higher accumulation of sugar and proline and lower accumulation of malondialdehyde content in leaf.

Keywords: Physiology, Water stress, Tolerance, Soybean

Location: Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Start Date: 00-01-2015

End Date: 00-04-2015

Program Area: Risk Management in Agriculture

Commodity: Soybean

Objectives:

Aim of the research work was to analyze the changes of physiological parameters those are associated with drought tolerance in soybean under water stress

Methodology:

The experiment was conducted at the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh. Four soybean genotypes namely i) BU Soybean 1 ii) Binasoybean 1 iii) Galarsum and iv) BARI Soybean 5 were grown in plastic pots of diameter (24 cm) X height (30 cm) during January to April, 2015. The soil used in the pot was clay loam in texture and poor fertility status. The pH of the soil was 7.1, organic carbon 0.60%, total N 0.05%, available P 0.08 mg/100 g dry soil, exchangeable K 0.33 cmol_c kg^-1 dry soil and CEC 14.58 cmol_c kg^-1 dry soil. Compost (¹/4 th of the soil volume) and 0.27-0.28-0.20 g of urea, triple super phosphate and muriate of potash per pot for supplying N, P₂O₅ and K₂O, respectively were incorporated uniformly into the soil. The compost was from cow dung which contained 0.8% N, 0.6% P₂O₅ and 1.0% K₂O on dry weight basis. Ten bold seeds were sown in each plastic pot containing about 12 kg air dried soil. After seedling establishment, six uniform and healthy plants were allowed to grow in each pot. Two watering regimes of the plants viz. control (80% of the field capacity) and water stress (50% of the field capacity) were maintained from at 1^st trifoliate growth stage i. e., 14 days after sowing up to maturity. The experiment was designed at Factorial Completely Randomized (CRD) with three replications. Relative water content, proline, total sugar and malondialdehyde (MDA) content of leaf were recorded at 15, 30 and 45 days after water stress. The uppermost fully developed leaves were collected from each plant and the relative water content (RWC), proline, malondialdehyde (MDA) and total sugar were measured according to Schonfeld et al.(1988), Bates et al. (1973), Health & Packer (1968) and Somogyi (1952), respectively. Normal management practices were applied for all treatments. At maturity two plants were collected from each pot. Data on number of pod/plant, number of seed/pod, 100 seed weight and seed yield/plant were recorded. Seed yield per plant was adjusted at 14% moisture content. The recorded data were statistically analyzed and the treatment means were compared by Least Significance Difference (LSD) test (Gomez & Gomez, 1984)

Source of Information: Bangladesh Agron. J. 2015, 18(2): 71-78

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Soybean Var. Binasoybean 1 showed relatively higher water stress tolerance in respect of yield compare to other genotypes . Higher water content, proline and sugar accumulation in leaf as well as lower accumulation of malondialdehyde (MDA) contributed to the higher drought tolerance in Bina soybean1 compare to other genotypes.

Knowledge Management: Journal