Science Alert
 
   
International Journal of Agricultural Research
  Year: 2010 | Volume: 5 | Issue: 6 | Page No.: 328-345
DOI: 10.3923/ijar.2010.328.345
Water-Deficit Stress During Seed Filling in Contrasting Soybean Genotypes: Association of Stress Sensitivity with Profiles of Osmolytes and Antioxidants
S. Angra, S. Kaur, K. Singh, D. Pathania, N. Kaur, S. Sharma and H. Nayyar

Abstract:
The objective of the present study was to elucidate the metabolic bases of sensitivity of soybean genotypes during seed filling to water stress that are otherwise least understood. Here, two contrasting soybean genotypes Pb1 (stress-tolerant) and Bragg (stress-sensitive) were water stressed by holding 50% of the water compared to controls for 10 days during the onset of seed filling stage (R5 stage). These genotypes were assessed for profiles of osmolytes and antioxidants during the course of water stress in the leaves. While, both the genotypes did not differ much till 4th or 6th day of stress, the differences appeared thereafter and were prominent at 10 day (last day) of stress. In general, Pb1 genotypes experienced lesser extent of stress injury and retained greater amount of water. This was associated with higher accumulation of sucrose, free amino acids, soluble proteins and proline by this genotype as compared to Bragg, which accumulated greater content of reducing sugars. The oxidative damage as lipid peroxidation was similar in both the genotypes but Bragg genotype had higher hydrogen peroxide levels. The antioxidants like ascorbic acid, catalase and ascorbate peroxidase were expressed greatly in Pb1 genotype than in Bragg genotype while superoxide dismutase activity did not differ between the two genotypes. It was indicated that Pb 1 genotype was affected to a lesser extent by water stress due to its superior capacity to generate osmolytes and antioxidants. Additionally, the seed components such as starch and proteins of the stressed plants experienced less damage in Pb1 genotype.
 [Abstract]   [Fulltext PDF]   [Fulltext HTML]   [References]   [View Citation]  [Report Citation]

COMMENTS
06 July, 2010
Frank sinota:
nice study. can be extended to differential gene display using these cultivars to corroborate the expression of these molecules
 
REPLY TO ABOVE COMMENTS
.
 
 
 
 

Are you a human?