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In situ and Ex situ Conservation of Commercial Tropical Trees - ITTO

In situ and Ex situ Conservation of Commercial Tropical Trees - ITTO

In situ and Ex situ Conservation of Commercial Tropical Trees - ITTO

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527Results <strong>and</strong> DiscussionRooting percentage <strong>of</strong> cuttings derived from RCT <strong>of</strong> both S. leprosula <strong>and</strong> S.selanica was better than those from wildlings (Table 1). This phenomenonmay be attributed to scion juvenility (Bonga 1982). Scions from wildlings werecollected from different-aged ortets, whereas scions from RCT were collectedfrom nursery-raised cuttings averaging 8-months-old.Table 1. Rooting percentage <strong>of</strong> cuttings from RCT <strong>and</strong> wildlingsSpeciesSource <strong>of</strong>scionsNo. <strong>of</strong>testedscionsRooting%S. leprosula RCT 5940 89Wildlings 10935 77S. selanica RCT 5175 83Wildlings 13230 73Two weeks after shoots were harvested, new shoots started to emerge.Shoots <strong>of</strong> S. leprosula grew faster than those <strong>of</strong> S. selanica. Figures 1 <strong>and</strong> 2show shoot growth <strong>of</strong> harvested seedlings. Sixteen weeks (about 4 months)after shoot harvesting, heights <strong>of</strong> new shoots <strong>of</strong> S. leprosula <strong>and</strong> S. selanicawere 27 cm <strong>and</strong> 16 cm, respectively. With initial height (after cutting) <strong>of</strong> bothspecies averaging 15 cm, the total height <strong>of</strong> S. leprosula <strong>and</strong> S. selanica thenbecomes 42 cm <strong>and</strong> 31 cm, respectively, a suitable size <strong>of</strong> meranti plantingstock for out planting (Kimura & Nishiyama 1999).Figure 2. Growth <strong>of</strong> new shoots <strong>of</strong> S. leprosula <strong>and</strong> S.selanica after shoots cut30Height (cm)201000 4 8 12 16leprosulaselanicaWeek

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