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Research Detail

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Md. Shawquat Ali Khan
Agronomy Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

M. Abdul Karim
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Abullah-Al-Mahmud
Tuber Crops Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Shahana Parveen
Irrigation and Water Management Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur, Bangladesh

Md. Mahfuz Bazzaz
Agronomy Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Md. Altaf Hossain
Tuber Crops Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

The study was carried out with three soybean genotypes viz. Galarsum, BD 2331 and BARI Soybean-6 in a vinyl house of Banghabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh during January to March, 2012. Treatments included control, water shortage, 50 mM NaCl irrigation, 50 mM NaCl irrigation with water shortage, 75 mM NaCl irrigation, and 75 mM NaCl irrigation with water shortage environments. The relative water content, xylem exudation, leaf water potential of soybean plants were sharply decreased at 75 mM NaCl salt combined with water stress environment. However, these changes were lower in Galarsum and recorded 74.28 % relative water content, 7 mg hr-1 xylem exudation rate and -1.03 MPa leaf water potential. Leaf temperature was more in BD 2331 and BARI Soybean-6 than Galarsum. Galarsum accumulated higher amount of proline in leaves under salt and water stress environment. At 75 mM NaCl salt combined with water stress treatment, the highest proline content was also recorded in Galarsum (2.34 μmoles g-1 fresh weight). Plant water status and biochemical changed sharply under combined salt and water stress condition. Among the soybean genotype, Galarsum was more capable than BD 2331 and BARI Soybean-6 to manage salt under water stress environment.

  Salt Stress, Water Stress, Relative Water Content, Xylem Exudation and Proline Content
  Vinyl house of the Department of Agronomy of Banghabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur
  00-00-2012
  00-00-2012
  Crop-Soil-Water Management
  Soybean

To analyze leaf water status, leaf temperature, xylem exudation and proline accumulation of soybean under salt and water stress environment.

The experiment was conducted in a vinyl house of the Department of Agronomy of Banghabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur, Bangladesh during winter, 2012. The location situated at about 240 23´ north latitude, 900 08´ east longitude and an altitude of 8.4m above sea level and adjacent to capital Dhaka city. Three tested genotypes of soybean (Glycine max L.) namely Galarsum, BD 2331 and BARI Soybean-6 were compared by six environmental conditions of salinity and water stress. Five sown seeds in the soil medium on January 20, 2012 in each plastic pots; 30 cm in height and 24 cm inner diameter. Each pot contained 12 kg air dried sandy loam soil. The soils of each pot were fertilized uniformly with 0.30 g of urea, 0.90 g of triple super phosphate, 0.60 g of muriate of potash and 0.60 g of gypsum. The pots were watered with the amount of 200 ml daily for easy germination. After the emergence and establishment, two uniform healthy seedlings per pot were allowed to grow for three weeks in equal environment. Protective measures were taken to control Jassids and white flies at vegetative stage. The environmental conditions were Control, Water shortage (irrigation with 70% depletion of available soil water when wilting sign developed), 50 mM NaCl irrigation, 50 mM NaCl irrigation + Water shortage, 75 mM NaCl irrigation, and 75 mM NaCl irrigation+ Water shortage. In salt water irrigation and water shortage treatments, initially all pots were irrigated with salt water for a week then followed water shortage, and thereafter salt water irrigations. The control plants were irrigated with tap water only with maintained field capacity. The experiment was arranged in Completely Randomized Design (CRD) with 3 replications. Different physiological parameters like Relative water content (RWC), Leaf water potential (LWP), Leaf temperature, Xylem exudation rate and proline accumulations were determined after 4 weeks of treatments imposition.

Following equation used to calculate relative water content of leaf:

Relative water content (RWC) = {(FW–DW)/(TW-DW)}X100           

where, FW =Fresh weight, DW=Dry weight, TW=Total weight

Xylem exudation rate was calculated by deducting cotton weight from the sap plus cotton weight and expressed per hour basis as follows:

Exudation rate = {(Weight of cotton + sap) - (Weight of cotton)} / Time (h)

Leaf water potential was measured with Scholander Bomb Technique. Proline was determined by ninhydrin method. Leaf temperature was measured by a hand held Infrared thermometer. Data were analyzed by STAR (Statistical Tool for Agricultural Research) program and the treatments means were compared by using Tukeys’s Honest Significant Difference (HSD) Test. Differences at P ≤ 0.05 were considered significant.

 

 

 

 

  Journal of Plant Sciences; 3(5): 272-278, (2015)
  
Funding Source:
1.  Government Budget:  
  

The relative water content, xylem exudation, leaf water potential of soybean plants were decreased more under salt and water stress environments than only salt or water stress. However, these changes were lower in Galarsum than BD 2331 and BARI Soybean-6. Leaf temperature was more in BD 2331 and BARI Soybean 6 than Galarsum. Galarsum accumulated higher amount of proline in leaves under salt and water stress. The results revealed that the genotype Galarsum was more capable than BD 2331 and BARI Soybean-6 to manage salt under water stress environment.

  Journal
  


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