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American Journal of Plant Physiology
Year: 2015  |  Volume: 10  |  Issue: 1  |  Page No.: 1 - 24

Growth and Physiological Response of Azadirachta excelsa (Jack) Jacobs Seedlings to Over-Top-Filling Treatment

Nurul-Nasyitah Shukor, Hazandy Abdul-Hamid, Arifin Abdu and Mohd-Kamil Ismail    

Abstract: 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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