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Inoculation of Dipterocarps Anisoptera Thurifera and Shorea Guiso with Ectomycorrhizal Fungi in Philippine Red Soil

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Inoculation of Dipterocarps Anisoptera Thurifera and Shorea Guiso with Ectomycorrhizal Fungi in Philippine Red Soil Philippine Journal of Science 141 (2): 229-241, December 2012 ISSN 0031 - 7683 Date Received: 13 Sept 2011 Inoculation of Dipterocarps Anisoptera thurifera and Shorea guiso with Ectomycorrhizal Fungi in Philippine Red Soil Nelly S. Aggangan1*, Jenny S. Aggangan2, Joy Charisse O. Bulan3 and Cheryll Anne S. Limos4 1National Institute of Molecular Biology and Biotechnology, University of the Philippines Los Baños, College, Laguna 4031, Philippines 2National Institute of Physics, University of the Philippines, Diliman, Quezon City, Philippines 3National Institute of Molecular Biology and Biotechnology, University of the Philippines, Diliman, Quezon City, Philippines 4Mathematics Department, Ateneo de Manila, Diliman, Quezon City, Philippines Dipterocarpaceae is the most important tree family in the tropical forests of Southeast Asia and the Philippine dipterocarp forests are famous for their high diversity and for the dominance of this family in its lowland forests. Unfortunately some of the species in the country are already considered as endangered. This experiment aimed to develop protocol in the production of quality rooted cuttings of Anisoptera thurifera (Blanco) Blume and Shorea guiso (Blanco) Blume for plantation experiments in red soil of Caliraya, Laguna, Philippines using controlled inoculation with ectomycorrhizal (ECM) fungi. Rooted cuttings of A. thurifera and S. guiso were prepared and inoculated with mycelial beads containing vegetative mycelia of ECM fungi: Pisolithus sp.1 (from Acacia coded internationally as PTG), Pisolithus sp.2 (from Eucalyptus coded internationally as H6394) or Astraeus sp. (from dipterocarps) and grown under nursery conditions. After four months, Astraeus sp. and Pisolithus sp.2 gave the highest levels of root colonization and height increments in A. thurifera. Pisolithus sp.1 promoted the highest fine root P concentration (1.37 mg/g) and P uptake (0.273 mg/root) while Astraeus sp. promoted the highest (0.199 mg/root) coarse root P uptake. In S. guiso, Pisolithus sp.2 promoted better growth and root P uptake than Pisolithus sp.1. Pisolithus sp.2 increased height increment (116%), root (26%), shoot (36%), and total (54%) plant dry weight over the control treatment. This fungus increased root P concentration and uptake by 15% and 153%, respectively, relative to the uninoculated control counterpart. Uninoculated cuttings had the lowest height increment, dry weight and root P concentration and uptake. In conclusion, Pisolithus sp.2 and Astraeus can be used to inoculate A. thurifera and Pisolithus sp.2 for S. guiso rooted cuttings in order to have quality planting materials for plantation establishment in red soil in Caliraya, Laguna and other reforestation sites in the Philippines with similar soil conditions. Key Words: Astraeus, cuttings, dipterocarps, ectomycorrhiza, Pisolithus INTRODUCTION dominated by dipterocarps (Garrity et al. 1992). The Philippine dipterocarp forest was famous for their high The Dipterocarpaceae is the most important tree family diversity (Newman et al. 1996) and for the dominance in the tropical forests of South-east Asia (Brearley 2011). of this family in its lowland forests, where dipterocarps The Philippines has a total land area of 30 million hectares contributed 94% of the timber volume (Soerianegara which was by nature covered with tropical rain forest & Lemmens 1994). Nowadays, only few remnants of *Corresponding author: [email protected] 229 Philippine Journal of Science Aggangan NS et al.: Ectomycorrhizal fungi on Dipterocarps Vol. 141 No. 2, December 2012 dipterocarp forests are left in the Philippine archipelago. ECM fungi is the most convenient and practical technique. As of 1999, the forest cover of the Philippines was Spores are extracted from mature fruit bodies which estimated at 18.3% of total land area, and the extent of usually appear during the onset of the rainy season. The primary forest at 2.7% (ESSC 1999). Most dipterocarp National Institute of Molecular Biology and Biotechnology forests in the Philippines vanished due to logging, (BIOTECH), University of the Philippines Los Baños shifting cultivation and transformation into settlements (UPLB) process the spores into tablet form with brand name or agricultural fields (Langenberger 2006). Philippine “MYCOGROE”. The drawback is the supply of spores dipterocarps such as Anisoptera thurifera (Blanco) Blume which is seasonal and dependent on the appearance of and Shorea guiso (Blanco) Blume are now considered as fruit bodies during the onset of the rainy season. Normally, endangered species. Fast exploitation was due to their our group go out in forest plantations during the onset of good wood and fiber qualities for a range of products. the rainy season (usually July to August) to collect fruit bodies. These days, however, rainy season is unpredictable. Establishment of dipterocarp plantations or enrichment For example, for the past few years, rainfall started as planting in the existing forest plantations with dipterocarps, early as March but there were no fruit bodies. Moreover, is one of the top priorities of the Philippine government. some ECM fungi belonging to the genera Scleroderma, This will ensure an adequate and sustained supply of the best Suillus, Russula, Astraeus, etc. are edible at young stage, quality timber and other wood products for local and export thus, the indigenous people (upland communities) collect market, and to conserve endangered species of Philippine these mushrooms and puffballs for food or as additional dipterocarps (Aggangan et al. 1997). Field plantings have income. Mature fruit bodies are needed for the production been unsuccessful due to soil acidity. Mycorrhizal fungi work of Mycogroe tablets. Sustainable supply of Mycogroe is well in marginal soil with acidic pH (Harley & Smith 1983) not assured. Vegetative mycelia can be taken from young Dipterocarps form symbiosis with ectomycorrhizal fruit bodies and can be produced in aseptic culture. ECM (ECM) fungi (Pampolina et al. 1994; Hoang and Tuan fungi such as Scleroderma, Suillus, Astraeus, and Pisolithus 2008). ECM fungi have shown a pivotal role in the can be grown and mass produced in aseptic culture thus growth and survival of seedlings in degraded sites (De la offering continuous supply of ECM inoculum. Mycelia Cruz et al. 1988). ECM fungi mobilize plant water and are macerated and can be applied as slurry or can be nutrient uptake via hyphae and increase plant resistance to encapsulated in alginate beads. environmental stresses (Harley & Smith 1983; Mejstrick Many soils in the Philippines are acidic (pH 3-5), with 1989; De la Cruz & Aggangan 1990; Smith & Read 2008). low nutrient availability especially nitrogen (N) and Production of dipterocarp planting materials could be from phosphorus (P) and lack other essential nutrients (Maglinao wildlings, seeds or from cuttings. Collected wildlings 1988). These soils geographically occur throughout the are possibly infected with indigenous mycorrhizal fungi country (Atienza 1989). Caliraya, Lumban, Laguna is but the effectivity in terms of growth promotion when one of the problem sites for reforestation because the outplanted in the field is not certain. Planting materials soil is very acidic (pH between 4 to 5) and contains from seeds or from cuttings are of advantage where high concentration of iron (around 50-100ppm) making controlled inoculation with preferred plant growth the color red due to iron oxides. Planted fast growing promoting species or strains of mycorrhizal fungi can be reforestation species such as mahogany (Swietenia done. Macropropagation by cuttings is usually done to macrophylla) and Acacia mangium and even the native produce planting materials in spite of the danger of genetic plant species in the area exhibit poor and stunted growth erosion. The growth of dipterocarp cuttings is normally with yellow leaves indicating either deficiency of essential slower than from seeds and this requires longer rearing nutrients such as phosphorus or toxicity symptoms. Due to period in the nursery before they can be outplanted in the acidity, applied inorganic fertilizers could be readily fixed field. Controlled inoculation with mycorrhizal fungi will making it unavailable for plant use (Brady & Well 1999). foster growth of nursery grown rooted cuttings and field At present, the Caliraya-Lumot watershed dam which is planting can be done earlier thus shortening the growing generating 40,000 horsepower hydroelectric power for period in the nursery and at the same time attaining the Manila and Southern Luzon (personal communication required height of planting materials (Malajczuk et al. with Greg Paredes, NAPOCOR, Lumban, Laguna), is 1994; Aggangan 1996; Turjaman et al. 2006). barely surrounded with forests. Thus, there is an urgent ECM inoculants could be rhizosphere soil from dipterocarp need to develop techniques that will ensure high survival forests, spores or vegetative mycelia. Soil from dipterocarp and fast growth of reforestation species including forests can be used to inoculate seedlings or cuttings dipterocarps specifically for Caliraya and for degraded grown in the nursery but it may contain both beneficial lands similar to that of Caliraya red soil. Example of places (e.g. mycorrhizal fungi) and harmful (pathogenic fungi) with red soil are in Tanay and Antipolo in the province of microorganisms. The use of spores or vegetative mycelia of Rizal, Novaliches and in Guimaras. 230 Philippine Journal of Science Aggangan NS et al.: Ectomycorrhizal
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