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PRODUCTION of FUNGAL PROTOPLASTS from SELECTED WOOD-DEGRADING FUNGI Chen Rui Graduate Research Assistant

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PRODUCTION of FUNGAL PROTOPLASTS from SELECTED WOOD-DEGRADING FUNGI Chen Rui Graduate Research Assistant PRODUCTION OF FUNGAL PROTOPLASTS FROM SELECTED WOOD-DEGRADING FUNGI Chen Rui Graduate Research Assistant and Jeflrey J. Morrell Assistant Professor Department of Forest Products Oregon State University Cowallis, OR 9733 1 (Received March 1992) ABSTRACT Studies of the effects of various chemicals on fungal growth are difficult to perform on filamentous fungi because of the difficulty of observing the protoplasm through the rigid hyphal wall, and because most activity occurs in the region near the hyphal tip. However, hyphae can be exposed to certain enzymes that degrade the cell walls, producing protoplasts. There are few reports of protoplast pro- duction from economically important wood decayers. In this report, protoplasts were produced from hyphae of the common wood-degrading fungi Phanerochaete chrj~sosporium,Postia placenta, Gloeo- phyllum traheum, and Trametes versicolor with a commercially prepared mixture of cell-wall degrading enzymes (Novozyme 234). Protoplasts were more readily produced from young hyphae; however, regeneration was better with older hyphae. Magnesium sulfate and mannitol (0.5 M) performed comparably well as osmotic stabilizers. Keywords: Basidiomycetes, protoplasts, regeneration, white rot, brown rot. INTRODUCTION Methods have previously been developed The presence of rigid cell walls, important for generating protoplasts from edible basidio- structurally to fungal hyphae, makes obser- mycetes (Kitamoto et al. 1984, 1988; Yanagi vation of the internal components difficult. et al. 1985; Toyomasu et al. 1986; Sudo and Most hyphal activity occurs near the growing Higaki 1988; Eguchi et al. 1990; Tamai et al. tip, where enzymes are secreted and wood- 1990), heartrot fungi (Trojanowski and Hut- decomposition products are reabsorbed into terman 1984; Trojanowski et al. 1985), and an the hyphae. As a result, studies of the mycelial array of Fungi Imperfecti (Sivan et al. 1990); phase of the fungus require large amounts of but there are few protocols available for gen- hyphal mass for observation of effects on a erating protoplasts from many economically relatively few cells. important wood-degrading fungi (de Vries and An alternative approach is to remove the Wessels 1972; Gold et al. 1983). We therefore cell wall, creating fungal protoplasts (Collings undertook to develop protocols for generating et al. 1988). Protoplasts are increasingly used protoplasts from three such fungi common to for inserting desirable genetic characteristics wood products. into fungi and plants, but they may also be useful for studying cell morphology under dif- MATERIALS AND METHODS ferent growth conditions or for monitoring the Protoplast generation was evaluated with effects of toxicants (Gadd and White 1985; Gloeophyllum trabeum (Pers. : Fr.) Murr. Gadd et al. 1987; Kihn et al. 1987). (Madison 6 17), Postia placenta (Fr.) M. Lars. Wood and F.111cr S<.i<.nce.25(1). 1993. pp. 6 1-65 Q 1993 by the Society or Wood Sc~enceand Technology 6 2 WOOD AND FIBER SCIENC:E, JANUARY 1993, V. 25(1) and Lomb. (Madison FP94267R), Phanero- coupled wheat germ agglutinin (FITC-WGA), chaete chrysosporium Burds. (BKMF- 1767), a lectin specific for the n-acetylglucosamine and Trametes versicolor (Fr. : Fr.) Pilat (Mad- residues in chitin, the principal polymer of most ison R105). The isolates were obtained from fungal cell walls. The cells were observed under the Center for Forest Mycology Research, For- a Leitz light microscope equipped with filters est Products Laboratory, Madison, Wisconsin. specific for FITC (Morrell et al. 1985). Cell P. chrysosporium, although not an important walls fluoresced strongly, while fungal proto- wood-degrading fungus in natural systems, was plasts were only weakly fluorescent. included for comparative purposes, as it has After enzyme treatment, 30 ml of maleic- been the subject of intensive investigation for NaOH buffer containing 0.5 M mannitol was its lignin-degradation capabilities and for pro- added to dilute the enzyme, and the proto- toplast generation (Gold et al. 1983). All fungi plasts were separated from the mycelial debris were maintained on potato dextrose agar. Small by filtration through a coarse sintered-glass fil- plugs (3-mm diameter) cut from the actively ter. The number of protoplasts was estimated growing edge of each culture were used to in- with a hemacytometer. oculate 50 ml of a medium containing 0.1% The protoplasts were then diluted 1: 1,000 yeast extract, 1O/o glucose, and 1% malt extract in a medium containing 0.5 M mannitol and in distilled water. The flasks were incubated 0-3.5% glucose in 50 mM maleic-NaOH buffer in stationary culture for 2, 4, 6, 8, 10, 12, or (pH 5.5). Glucose was varied to allow obser- 14 days at 28 C; then 0.25 g (fresh wt.) of vation of the effect of sugar on regeneration. mycelium was asceptically removed, homog- Cell-wall regeneration was evaluated by in- enized in a Waring blender, and filtered by cubating 2 ml of the protoplast suspension at suction. The mycelium was washed twice with 28 C for 3-7 days, then spreading the solution sterile, distilled water and twice with 0.5 M on 2% agar containing 0.5% yeast extract, 0.5% mannitol or 0.5 M magnesium sulfate (MgSO,) malt extract, and 2% dextrose. The protoplasts in maleic sodium hydroxide (NaOH) buffer were incubated for 10-15 days at 28 C and (pH 5.5). McIlvaine's buffer and acetic acid- observed for the presence of discrete fungal NaOH buffer were also tested, but they ap- colonies, which served as the measure of suc- peared to inhibit protoplast release and were cessful regeneration. not used further. Once protoplast regeneration was con- The washed mycelium was resuspended in firmed, the effects of colony age, glucose con- 3 ml of a medium composed of 0.4% Novo- centration, and pH on protoplast production zyme 234 (NOVO Industria A/S, Bagsaverd, and regeneration were examined for each of Denmark), a mixture of cell-wall degrading en- the test fungi. zymes, in 50 M maleic-NaOH buffer (pH 5.5) containing 0.5 M mannitol or MgSO,. Addi- RESULTS AND DISCUSSION tional trials were performed with 0.3,0.5, 0.6, or 0.7 M MgSO, as the osmotic stabilizer. The Protoplast production mixture was incubated at 30 C for 2 hours with Protoplasts were generated from all four fun- occasional agitation. The effects of other vari- gi tested, although the results differed among ables were explored by altering the pH of the species. Protoplast production was greatest with enzyme mixture from 4.5 to 6.5 and the ex- P. chrysosporium and T. versicolor and lowest posure time to the enzyme mixture from 60 with P. placenta (Fig. 1A). Previous trials with to 180 minutes. Protoplast formation was ini- a different isolate, P. chrysosporium, produced tially observed by examining a small sample significantly higher levels of protoplast release for evidence of protoplasts. The presence of (Gold et al. 1983). These differences may re- residual cell wall was monitored by reacting flect media or isolate variations. Interestingly, the suspension with fluorescein isothiocyanate regeneration in the current study was approx- Rui and Morrell-PROTOPLASTS FROM SELECTED WOOD-DEGRADING FUNGI 6 3 MAGNESIUM SULFATE MANNITOL FIG.2. Effect of 0.5 M magnesium sulfate and man- nit01 as osmotic stabilizers for releasing fungal protoplasts from liquid cultures of Gloeophyllum trabeum, Postia pla- centa, Trametes versicolor, and Phanerochaete chrysospo- rium. stabilizer, although the differences between that stabilizer and 0.5 M mannitol were generally small (Fig. 2). Both stabilizers are used for re- leasing basidiomycete protoplasts; MgSO, per- haps more commonly (Gold et al. 1983; Tro- janowski et al. 1985). Increasing the concentration of MgSO, from 0.3 M to 0.5 M resulted in increased release of protoplasts with P. chrysosporium, G. trabeum, and T. versi- color, but release declined at 0.6 and 0.7 M (Fig. 1B). P. placenta appeared least affected by pH, but only low levels of protoplasts of this species were released at any pH level test- ed. Protoplast production declined in all test fungi when 0.7 M MgSO, was used as the os- pH motic stabilizer. The pH of the maleic-NaOH FIG. 1. Effect of (A) hyphal age, (B) magnesium sulfate concentration in the stabilizer, and (C) pH of the extraction buffer also appeared to influence protoplast medium on the production of fungal protoplasts from cul- generation with G. trabeum. Optimum num- tures of Gloeophyllum trabeum, Postia placenta, Trametes bers of protoplasts released appeared at pH versicolor, and Phanerochaete chrysosporium. 5.5-6 and declined on either side of that range (Fig. 1C). imately 5 times that found in the previous study (Gold et al. 1983). Hyphal age played a critical Protoplast regeneration role in protoplast production. In general, pro- Protoplast regeneration provides a relative toplast numbers decreased with increasing age measure of the effects of enzyme treatment on of the culture, perhaps reflecting the senes- cell viability. Protoplasts that lack the ability cence of large parts of the mycelial mat. Pre- to regenerate presumably either lack nuclei or vious studies have employed younger cultures were damaged at some point during or after to avoid this problem and enhance protoplast the enzyme treatment. In contrast with pro- yield (Trojanowski et al. 1985; Eguchi et al. toplast release, regeneration improved with in- 1990). creasing age of the cultures of all four species Protoplast production was generally greater from which they were produced (Fig. 3A). The when 0.5 M MgSO, was used as the osmotic reasons for this effect are unclear, since older 64 WOOD AND FIBER SCIENCE, JANUARY 1993, V. 25(1) cells would presumably be less plastic and therefore less capable of responding to the stresses induced during protoplast formation. Interestingly, plating efficiency did not differ markedly among species, suggesting that P.
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