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Morpho-physiological Traits of Soybean as Affected by Drought

IA Rima
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

MA Mannan
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

MAA Mamun
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

ZU Kamal
Department of Soil Science Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted to study the effects of water deficit stress on morphophysiological parameters in soybean plant in pots at the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during February to June, 2018. Seven soybean genotypes namely,i) G00081 ii) G00056 iii) Shohag iv) G00078 v) G00137 vi) G00035 and vii) G00060 were grown in two watering regimes viz. control (80% of the field capacity) and water deficit stress (50% of the field capacity). Morpho-physiological traits including plant height, number of leaf, relative water content, water saturation deficit, chlorophyll, proline, dry matter and yield were investigated. Results indicated that genotypic variability was found in water deficit stress tolerance in soybean. It was found that leaf of the genotype G00081 maintained higher water content, higher accumulation of prolineas well as less reduction of chlorophyll compared to other genotypes studied. Total dry matter accumulation and grain yield plant^-1 was also higher in this genotype. Genotype G00081 also showed relatively higher water deficit stress tolerance. On the contrary, G00035 was found to be susceptible showing lower yield. Higher water deficit stress tolerance in G00081 was attributed to higher relative leaf water and chlorophylls with accumulation of higher amount of proline.

Keywords: Morpho-physiology, Water stress, Soybean

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

Start Date: 00-02-2018

End Date: 00-06-2018

Program Area: Crop-Soil-Water Management

Commodity: Drought, Soybean

Objectives:

The present study was undertaken to analyze the changes of morpho-physiological parameters that are associated with water deficit stress tolerance of soybean.

Methodology:

The experiment was conducted in the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during February to June, 2018. It was located at 24.090 N latitude and 90.260 E longitudes at an elevation of 8.4 m from the mean sea level. The soil of the pot was fertilized uniformly with 0.9, 0.8 and 0.8 g urea, triple super phosphate and muriate of potash corresponding to 160-150-150 kg urea, triple super phosphate and muriate of potash per hectare, respectively. Ten healthy seeds of seven soybean genotypes namely i) G00081 ii) G00056 iii) Shohag iv) G00078 v) G00137 vi) G00035 and vii) G00060 were grown in each pot in 15 February, 2018. Light irrigation was given by using the water can to ensure uniform germination of seeds after sowing. Two water regimes i) Control (80% field capacity) ii) Water deficit stress (50% field capacity) were maintained from 1^st trifoliate (14 days after germination) stage to maturity using portable digital moisture meter (POGO Soil Sensor II, Stevens, USA). Different intercultural operations were done as and when were necessary. Data on plant height, number of leaf / plant, dry weight of leaf, stem and total dry matter were collected at 40 days after drought imposition. Leaf chlorophyll, proline and water relations traits were measured at flowering stage. Yield and yield contributing data were collected after harvest. The recorded data were statistically analyzed by “MSTAT-C” software to examine the significant variation of the results due to different treatments. The treatment means were compared by Least Significance Difference (LSD) test at 5% level of significance (Gomez and Gomez, 1984).

Source of Information: Bangladesh Agron. J. 2019, 22(2): 41-54

Article Link (Online Journal): DOI: https://doi.org/10.3329/baj.v22i2.47619

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the above results, it may be concluded that wide range of variability of morpho-physiological parameters associated with water deficit stress tolerance was found in the soybean genotypes tested. Water deficit stress exerted inhibitory effects on dry matter accumulation and yield of soybean. G00081 showed a relatively higher water deficit stress tolerance while G00035 was susceptible in terms of dry matter accumulation and yield performance. It may be concluded that higher water deficit stress tolerance in G00081 was associated with higher water content in leaf, higher accumulation of proline and less reduction of leaf chlorophyll.

Knowledge Management: Journal