Growth light conditions of stock plants enhance the growth and morphology of shoots and rooting ability of jackfruit (Artocarpus heterophyllus) cuttings
2011
Hossain, M.A. (University of Chittagong (Bangladesh). Inst. of Forestry and Environmental Sciences) | Kamaluddin, M. (University of Chittagong (Bangladesh). Inst. of Forestry and Environmental Sciences)
The study describes the effects of growth light conditions on growth and morphology of stock plants and rooting ability of cuttings for mass clonal propagation of jackfruit (Artocarpus heterophyllus Lam.) without application of rooting hormone. Forty five days-old containerized stock plants were placed under three different levels of light: full sun (Red to far red ratio 1.25), partial shade (R: FR 1; 60% of full sun) and deep shade (R: FR 0.4; 3% of full sun) for 45 days. Half of the stock plants growing in partial shade or deep shade were transferred to full sun for another 15 days and growth and morphology of shoots and rooting ability of cuttings were investigated. Growth and morphology of shoots and rooting ability of cuttings was significantly affected by the growth light conditions of stock plants. Internode number was significantly fewer, but internode length, leaf area and specific leaf area was higher in deep shade and deep shade to full sun regime. Leaf weight per unit area was decreased gradually, when sun-grown stock plants were transferred to deep shade or partial shade and regained on returning them from the shade to full sun. The highest rooting percentage (100%), maximum number of root (6.3) and root dry weight (62 mg) per cutting was obtained from the cuttings of deep shade to full sun regime followed by deep shade and the lowest was in full sun regime without application of any rooting hormone.
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