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Articles by Nurul-Nasyitah Shukor
Total Records ( 3 ) for Nurul-Nasyitah Shukor
  Nurul-Nasyitah Shukor , Hazandy Abdul-Hamid , Arifin Abdu and Mohd-Kamil Ismail
  In this study the effects of waterlogging were examined on growth and physiological characteristics of Azadiractha excelsa, one of the famous indigenous tree species used for urban landscape. Forty eight seedlings about 3 year-old subjected to waterlogged for three time durations, i.e., 1, 2 and 3 weeks and at its recovery. The results had shown the highest survival percentage in two weeks of waterlogged seedlings, decreased rate in diameter, leaf area and chlorophyll content in waterlogged seedlings. In spite of all these, there was an increased in height for waterlogged treatment as compared to control. High biomass of stem was found in waterlogged treatment. There were no differences among treatments for the ratio maximum quantum efficiency of the photosystem II (Fv/Fm) and gas exchange parameters except vapour pressure deficit (VpdL). The disturbed water relation also occurred in waterlogged seedlings. Azadirachta excelsa seedlings were found to only tolerate with stress of being waterlogged up to two weeks of treatment. However, the recovery seedling leaves can still perform well in its physiological performance.
  Nurul-Nasyitah Shukor , Hazandy Abdul- Hamid , Arifin Abdu and Mohd-Kamil Ismail
  Urban landscape trees have always been very much exposed to the stresses of soil compaction. Trees in such condition need high flexibility in both morphological and physiological attributes to survive well. This study was conducted to determine the effect of soil compaction on Azadirachta excelsa seedlings by imposing different levels of compacted medium with bulk density at 1.2, 1.4 and 1.6 g cm-3. Growth and physiological characteristics were assessed and repeated measures analysis was used to analyze the differences between treatments. The results showed that the seedlings were seen struggling to survive but still sprouting new shoots even after showing dying symptom. Significant decrease in leaf elongation also occurred in this experiment resulting from root damage thus initiated reducing physiology performance in leaf traits. However, biomass data showed persistent relation towards root sensitivity of the system architecture. Gas exchange attributes were also found to decrease significantly between treatments but not for other water related parameters such as predawn and midday water potential, hydraulic conductance and water use efficiency. It was decisively found that this species is partially tolerable towards soil compacted condition due to its ability to resist permanent damage and stress avoidance.
  Nurul-Nasyitah Shukor , Hazandy Abdul-Hamid , Arifin Abdu and Mohd-Kamil Ismail
  Over-top-filling is one of common stresses experienced by urban landscape trees. Flexibility of morphological and physiological is needed by trees to survive in over-top-filling. This study was conducted to determine the effect of over-top-filling on Azadirachta excelsa seedlings by imposing different levels of soil over-top-filling, i.e, 10, 20 and 30 cm. Soil was mounted above the normal collar and covered. Growth and physiological characteristics were assessed, and repeated measures analysis was used to analyze the differences among times and treatments. The repeated measures results showed various patterns of morphological growth throughout the experiment. In general, treated A. excelsa seedlings showed positive growth due to the extra availability of nutrients in the soil. Leaf mass ratio was high in the 30-cm over-top-filling treatment, indicating a large amount of chlorophyll. In addition, new development of root area showed a persistent relation to root sensitivity of the system architecture by increasing root volume. Chlorophyll fluorescence was found to be higher in the treated seedlings compared to the controls. Gas exchange attributes were also found to vary among treatments, but not other water-related parameters such as predawn and midday water potential, hydraulic conductance, and water use efficiency. It was decisively found that this species is partially tolerant of over-top-filling due to its ability to resist permanent damage and due to its stress avoidance.
 
 
 
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