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Articles by D. Habibi
Total Records ( 2 ) for D. Habibi
  H.R. Tohidi-Moghadam , A.H. Shirani-Rad , G. Nour-Mohammadi , D. Habibi and M. Mashhadi-Akbar-Boojar
 

Problem statement: Drought stress significantly limits Canola (Brassica napus L.)growth and crop productivity. Hence, efficient management of soil moisture and study metabolicchanges which occur in response to drought is important for agricultural production of this Crop.
Approach:
For a better understanding of drought tolerance mechanisms and improving soil watercontent management strategies, an experiment was laid out in a randomized complete block designwith factorial spilt arrangement with tree replications.
Results:
Irrigation strategy and super absorbentapplication were allotted to main plots. Irrigation strategy had two levels: 80% of evaporation ascontrol (I1), drought stress started from flowering stage (I2) Application of super absorbent had twolevels: Non-application of super absorbent as control (S1), application of super absorbent with 7%concentration. Cultivars (Rgs003 (V1), Sarigol (V2), Option500 (V3), Hyola401 (V4), Hyola330 (V5),Hyola420 (V6) were allotted to sub plots. Plants under water deficit stress and application of superabsorbent showed a significant increase and decrease, respectively, in SOD, CAT and GPX activitiesin leaves compared with control plants. In this context, plants with higher levels of antioxidantsshowed higher resistance to these stress conditions and higher yield and dry matter allocation to grainfilling process i.e. harvest index.
Conclusion/Recommendations:
Our results suggested that droughtstress leads to production of oxygen radicals, which results in increased lipid peroxidation andoxidative stress in the plant. In conclusion of present study, Application of super absorbent polymercould reserve different amounts of water in itself and so increases the soil ability of water storing andpreserving and at last in water deficiency, produce plant water need and approve its growth underpostanthesis water deficiency.

  H. Soleimanzadeh , D. Habibi , M. Ardakani , F. Paknejad and F. Rejali
  Problem statement: Drought stress as a major adverse factor can lower leaf water potential, leading to reduced turgor and some other responses and ultimately lower crop productivity in arid and semi arid zones. Sunflower is one of the main oil seed crops in Iran, where drought stress is the most limiting factor. Drought stress tolerance requires the activation of complex metabolic activities including antioxidative pathways, especially Activated Oxygen Species (AOS) and scavenging systems within the cells which can contribute to continued growth under drought stress. Approach: To evaluate the effect of limited irrigation systems and potassium fertilizer on grain yield, antioxidant enzymes and lipid peroxidation biomarker (MDA), the crop was sown in the Research Farm of College of Agriculture, Islamic Azad University, Karaj Branch in 2009. The experimental treatments were arranged as split plots based on a Randomized Complete Block Design with three replications. The main plots were allocated to three different irrigation regimes. The irrigation regimes comprised of: Full Irrigation (IR1), Moderate drought stress (IR5) and Severe drought stress (IR2). The subplots were allocated to four potassium chemical fertilizer (Potassium nitrate) consisting of K1 = 25, K2 = 50, K3 = 75 and K4 = 100% recommended. Results: Plants under drought stress and potassium levels showed a significant increase and decrease, respectively, in SOD, CAT and GPX activity and MDA in compared to control plants. In this context, plants with higher levels of potassium showed higher resistance to drought stress conditions and higher yield and dry matter allocation to grain filling process i.e. harvest index. Results of this study suggested that drought stress leads to production of oxygen radicals, which results in increased lipid peroxidation (MDA biomarker) and oxidative stress in the plant. Conclusion: The scavenging of AOS by the scavenging system especially by SOD, CAT and GPX was done well and damage to membranes or MDA was controlled at higher levels of potassium.
 
 
 
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