Author(s) NGUYEN TRAN NGUYEN (1) ; MOHAPATRA Pravat K. (2) ; FUJITA Kounosuke (1) ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s) (1) Graduate School of Biosphere Sciences, Hiroshima University, 1-4-4, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, JAPON Abstract Seedlings of Melaleuca cajuputi (M. caj) and Eucalyptus camaldulensis (E. cam) were grown in acidic (pH 4.2) solution culture medium. Half of the plants in each species were subjected to Al toxicity (160 μM {Al[3+]}) for 31 days, and the effects of this stress on root and shoot growth, uptake of Ca, K, P, Fe and Al, and leaf area were studied at intervals. In comparison to M. caj, E. cam was less tolerant to Al toxicity and exhibited symptoms of leaf necrosis after the first 10 days of exposure. The dry mass of various plant parts of E. cam increased during the pre-necrotic period and declined significantly in the post-necrotic period in response to Al toxicity. Al toxicity significantly reduced the Ca, Fe, P and K concentration in the roots of E. cam; the effect was more severe in the post-necrotic period compared with the pre-necrotic period. Although the shoot and roots of the Al-tolerant M. caj accumulated more Al, growth and mineral concentration in these organs were less affected in comparison to the sensitive E. cam. In the post-necrotic period, leaf area and number and chlorophyll concentration were reduced and peroxidation of lipid increased significantly in the newly developing leaves of Al-stressed E. cam. The mechanism of Al induced stress influence on E. cam has been discussed in the context of growth promotion due to relief from proton-induced stress in the pre-necrotic period and reduction of growth due to membrane damage in the post-necrotic period.
(2) School of Life Sciences, Sambalpur University, Jyoti Vihar, Sambalpur 768019, INDE
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