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Articles by Marziah Mahmood
Total Records ( 2 ) for Marziah Mahmood
  Mohd Razi Ismail , Mohd Kamil Yusoff and Marziah Mahmood
  Young tissue cultured banana plants (Musa spp. Cv Pisang mas and Berangan) were subjected to different treatments of water deficit. Plants subjected to reduced water availability showed marked decreases in plant vegetative growth and perturbation in water relations and stomatal response. Stem girth and leaf elongation were markedly reduced after 7 days of withholding water. Regardless of a large depletion in soil moisture content, there was only a small reduction in leaf water status measured as relative water content. Stomatal conductance was more sensitive to the depletion of soil moisture content compared to leaf water status. A large and early decrease in stomatal conductance was shown not to be correlated with the reduction in relative water content. Proline concentration in banana leaf tissue was increased with the onset of water stress. The study also showed that stomatal conductance of banana plants was affected by the changes in Vapor Pressure Deficit (VPD) in both irrigated and water-stressed plants.
  M. Awad Hamad , Mohd Razi Ismail , Marziah Mahmood and T.M.M. Mahmud
  The effect of drying soil upon spatial distribution of leaf expansion, cell wall associated peroxidase activity and xylem sap pH in currently expanding leaves of Capsicum annuum L. was investigated. Soil water deficit reduced leaf expansion dramatically compared to plants which were well watered. Assayed cell wall associated peroxidase activity and xylem sap pH of droughted plants increased in the leaves to 10 fold than those found in well-watered plants of well-watered treatment. In the leaves of droughted plants highest cell wall associated peroxidase activities were observed in the regions of the leaf where expansion was occurring most rapidly in the well-watered plants. This increase in cell wall associated peroxidase activity and its spatial variation provides preliminary evidence that cell wall associated peroxidase activity may restrict cell expansion and subsequently leaf expansion in dicotlydenous species during periods of water deficit. Sap pH increased with increasing the intensity of water deficit and the differences were statistically significant as compared to those of well watered plants. Xylem sap of droughted plants was highest and well associated with lower transpiration rate.
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