Comparison of Differences Between the Wood Degradation by Monokaryons (n)
and Dikaryons (2n) of White Rot Fungus (Cambodian Phellinus linteus)
Cambodian Phellinus linteus is a white rot fungus that
behaves as a plant pathogen. This fungus was first used for studying changes
in the wood chemistry and structure of Shorea (Shorea obtusa). Cambodian
P. linteus comprises two different types of mycelia, namely monokaryon
(n) and dikaryon (2n). Wood blocks of Shorea were exposed to monokaryons
and dikaryons under in vitro condition and biodegradation took place
over a 12-week-period. Shorea wood block degradation was determined by
(1) wood weight loss (2) Fourier Transform Infrared (FTIR) and (3) Scanning
Electron Microscopy (SEM). Results showed that the degradation of Shorea
wood blocks by monokaryons and dikaryons was 57.48 and 55.73%, respectively.
The FTIR analyses showed that the Shorea wood blocks degraded by the
monokaryons and dikaryons were differed in their chemical components (aromatic,
C-H and C-O). The results also suggested that the lignin and carbohydrates were
decayed. Meanwhile, the C-O, C-O-H and C-H groups were decreased, revealing
that hemicelluloses and cellulose polymers were broken down by hydrolytic enzymes
during fungal growth. SEM was used to observe the physical changes of the Shorea
wood blocks and it showed that the wood cells were changed. In conclusion, Cambodian
P. linteus monokaryons are more appropriated for the paper industry
(biopulping and bio-breaching) and enzyme technology than dikaryons, due to
monokaryons leave no dark pigments and residues from the fruiting bodies. Moreover,
monokaryons have a simple genetic system (n) for genetic and biochemical analyses.
to cite this article:
Prayook Srivilai, Wasana Chaiseana, Panida Loutchanwoot and Piyarat Dornbundit, 2013. Comparison of Differences Between the Wood Degradation by Monokaryons (n)
and Dikaryons (2n) of White Rot Fungus (Cambodian Phellinus linteus). Journal of Biological Sciences, 13: 131-138.
December 20, 2012; Accepted: February 26, 2013;
Published: May 30, 2013
In Southeast Asia, houses are mostly constructed from wood and timbers. Various
types of farm equipments are also produced with wood. Wood buildings and farm
equipments, including archaeological works, are mostly destroyed by fungi as
Southeast Asia is located in a tropical zone and the weather is warm with high
humidity, which are appropriate conditions for fungal growth. The fungal spores
generate mycelium which is the initial stage of the fungal life cycle. During
fungal growth mycelium releases extracellular enzymes that destroy the wood
structures, causing a loss of economic value. Various items in the literatures
mentioned that wood degradation is caused by white-rot, brown-rot and soft-rot
fungi (Blanchette et al., 1985; Pandey
and Pitman, 2003, 2004). White, brown and soft-rot
fungi are major groups of wood degradation fungi. Fungi slowly destroy wood
and trees, unlike wood degradation by insects. Fungal and insect degradations
mainly causes death and decreased the number of living trees in forests, i.e.,
natural forests, public parks and commercial angiosperm forests (Breen
and Singleton, 1999). Decay causing fungal species, such as Phanerochaete
chrysosporium, Trametes versicolor, Ganoderma spp. Ceriporiopsis
subvermispora, Lentinus endodes, Schizophylum commune, Phellinus
flavomarginatus and Phellinus igniarius are well known as causes
of biodegradation due to the production of hydrolytic enzymes during growth
(Blanchette et al., 1985; Ferraz
et al., 2000; Pandey and Pitman, 2003,
2004). Most basidiomycetes (mushrooms) consist of two
different types of mycelia in a life cycle. There is a sterile primary mycelium
or monokaryon/vegetative mycelium (n), containing a nucleus in a hyphal cell
and a set of genes and another fertile secondary mycelium or dikaryon (2n),
containing two different nuclei per a hyphal cell. The two sets of genes result
in the dikaryons being able to form the fruiting body (Kües,
2000; Kothe, 2001). In general, white rotting fungi
degrade lignin by secreting extracellular oxidative enzymes that diffuse and
immediately attack the wood. Lignin is present in high concentrations in wood
cells and their wall components. When lignin is degraded by white rot fungi,
defibrillation and dissolution of the middle lamella were occurred resulting
in white rot of the wood. In contrast, brown rot fungi specifically decay carbohydrates
with limited lignin degradation, causing brown rot of the wood (Blanchette
et al., 1985). Phellinus flavomarginatus is a white rot fungus
commonly studied in the decomposition of Eucalyptus grandis and found
that litter wood biomass was lost (Fischer and Binder,
2004). The effects of white rot fungi on wood components are usually studied
by Fourier Transform Infrared Spectroscopy (FTIR), near infrared spectroscopy
and Scanning Electron Microscopy (SEM) (Pandey 1999;
Pandey and Pitman, 2003, 2004;
Worrall et al., 1997; Akio
et al., 1988; Fackler et al., 2007).
FTIR is a useful technique for investigating wood decay even though sample preparation
is limited (Faix 1992; Pandey 1999;
Pasikatan et al., 2001; Pandey
and Pitman, 2003; Schwanninger et al., 2004;
Rana et al., 2010). FTIR has also been used
for component analysis of wood including changes in the chemistry of the wood,
such as in lignin, cellulose, hemicelluloses and other wood chemistry (Schultz
and Glasser, 1986; Rodrigues et al., 1998).
Light and electron microscopy have been primarily used to analyse fungal attacks
(Raberg and Daniel, 2009). The behaviour of hyphal
penetration was studied by SEM (Worrall et al.,
1997; Fischer and Binder, 2004; Genestar
and Palou, 2006).
Cambodian P. linteus is a plant pathogen that is commonly found
in the tropical forests of Cambodia. The fruiting body of this fungus whose
weight is approximately 5.5 kg (Natural Medicinal Mushrooms Museum of Mahasarakham
University) is bigger than those of other P. linteus specimens.
Cambodian P. linteus has two different types of mycelium, i.e.,
monokaryon and dikaryon. Its mating type system is heterothallic and functions
as bipolar. Shorea obtusa is a hardwood tree and a famous commercial
wood that has been used for houses and other forms of construction. This tree
species is in the Dipterocarpaceae family. It is commonly found in Myanmar,
Cambodia, Laos, Vietnam and Thailand. Moreover, S. obtusa is a suitable
host tree for P. linteus, which can reach 10-30 m tall (http://en.wikipedia.org/wiki/
Most wood degradation studies either used monokaryons or dikaryons, while the
comparative data of wood degradation between monokaryons and dikaryons is on
the litter. Therefore, the objective of this study was to determine the differences
between the wood degradation by monokaryons (n) and dikaryons (2n) of Cambodian
P. linteus, focusing on the changes in the structure and chemical
composition of Shorea wood. Biodegradation time was 12 weeks and monitoring
was accomplished by wood weight loss and FTIR, whereas the behaviour of the
hyphal growth in the wood samples was investigated by SEM.
MATERIAL AND METHODS
Wood preparation, fungal strain, inoculation and test conditions: The
experiment was performed on October 2011 to January 2012. S. obtusa
wood blocks (approximately 1x1x2 cm) were washed with sterile water and oven
dried at 60°C, until a constant weight was achieved. The Shorea wood
block samples were packed in autoclaved plastic bags and sterilized by autoclaving
at 121°C for 15 min and then the moisture was removed by oven drying at
60°C. Then 3 sterilized Shorea wood blocks were placed on stainless
steel net supporters closed to the edge of a 250 mL Erlenmeyer flask, containing
100 mL of Malt Extracted Agar (MEA; 10% w/v of malt extract; 12% w/v agar).
The wood blocks were then inoculated with a 1.5x1.5 cm agar plug of active monokaryonotic,
or dikaryotic mycelium and loosely closed by a sterilized cotton plug and kept
at room temperature (30-32°C, 50-60% humidity) for 90 days. The experiment
was designed as three replicates (2 monokaryonsx3 = 6 Erlenmeyer flasks and
18 wood blocks; 2 dikaryonsx3 = 6 Erlenmeyer flasks and 18 wood blocks).
Wood weight loss determination: Residual mycelium from the surface of
Shorea wood blocks was removed and the wood block samples were oven-dried
to a constant weight at 60°C and then weighed. Then the wood weight loss
Fourier transforms infrared (FTIR) examination: FTIR spectra of un-decayed
and decayed wood block samples were measured by direct transmittance using the
KBr pellet technique. Spectra were recorded using a Spectrum GX (FT-IR system
49931) by Perkin Elmer. Small pieces of wood block samples were ground using
a mortar. The wood powder was mixed with KBr powder at a concentration of 0.5-1%.
Pelleted samples were detected by IR spectroscopy. All spectra were measured
at a spectral resolution of 400-4000 cm-1.
Scanning electron microscopy observation: Pieces of Shorea wood
block samples were observed by SEM. For SEM performance, Shorea wood
samples were fixed in 2.5% glutaradehyde in 0.1 M phosphate buffer (pH 7.2)
overnight at 4°C and then washed with the same buffer. The wood samples
were then fixed in 1.7 Osmiumtetraoxide for 2 h before being washed with distilled
water. Shorea wood samples were fixed and dehydrated in an acetone series
(20, 40, 60, 80 and 100%) and then left to air dry. Gold coated sample films
were determined using a SEM (JSM 6460 LV).
Statistical analysis: Data is presented as Mean±Standard Deviation
(SD). Significant differences among all treatment groups were analysed by one-way
ANOVA with the Tukey post-hoc test followed by the Students t-test
(PrismTM; GraphPad, San Diego, CA, USA). The p values<0.05 were considered
RESULTS AND DISCUSSION
Monokarotic and dikaryotic growth: Active monokaryotic and dikaryotic
mycelium were inoculated in 250 mL Erlenmeyer flasks containing 100 mL MEA.
Three wood blocks of S. obtusa were placed on the medium surface.
Three days after mycelial inoculation, monokaryotic mycelium directly grew on
the wood blocks and fully covered the medium surface within 6 days. The growth
rate of monokaryotic mycelium was 0.7±0.15 cm per day. At 21 days, monokaryotic
mycelium was tightly packed without fruiting body formation. At 90 days, mycelium
was white, dense and flat with no fruiting body. Dikaryotic mycelium was exposed
to the wood blocks that were placed on the surface of the MEA. Dikaryotic mycelium
grew fast, more protuberant and fully covered the medium surface within 5 days.
The growth rate of the dikaryontic mycelium was 0.9±0.1 cm day. At 21
days, dikaryotic mycelia developed and formed the initial fruiting bodies (size
= 2-5 mm) on both inoculums and wood blocks. The morphological features of the
initial fruiting bodies resembled the sponge. At 90 days, mycelium was light
brown and the size of the initial fruiting bodies was a bit bigger. The results
suggested that dikaryotic mycelium grew more actively than monokaryotic mycelium,
which is a comparable growth rate to the dikaryotic mycelium of Coprinopsis
cinerea and S. commune and also similar to the mycelial growth
rate of the famous white rotting fungus (T. versicolor) (Addleman
and Archibald, 1993). Dikaryotic mycelium tended to grow faster with denser
and more vigorous propagating characters (Kües, 2000;
Weight loss data: The average initial weight of the wood block samples,
i.e., before degradation by monokaryotic mycelium, was 2.083±0.282 g.
After 90 days incubation, the average final weight of the wood block samples
was 0.886±0.085 g, contributing to the net weight loss of 57.48%. Meanwhile,
the average weight of the wood block samples before incubation with dikaryotic
mycelium was 2.1140±0.3630 g. After 90 days incubation, the average weight
of wood block samples was 0.9358±0.0461 g; the wood weight loss was 55.73%
Wood weight loss when decayed by monokaryons was more than those of dikaryons
by approximately 1.75%. However, the efficiencies of the wood degradation by
monokaryons and dikaryons were not statistically significant difference (Fig.
1). It was indicated that Cambodian P. linteus is highly efficient
for wood degradation (approximately 56%) as the other wood decaying fungi such
as T. versiolor and P. chrysosporium. Faix
et al. (1993) studied the chemical changes in beech wood decayed
by the white rot fungi T. versicolor, Pleurotus ostreatus and
L. edodes and found that after 14 weeks of incubation, the average wood
weight loss were 51, 27 and 24%, respectively (Faix et
||Comparison of the weight of Shorea wood blocks after
incubation with monokaryons and dikaryons. *P<0.05 means a statistically
significant difference was found in the monokaryotic and dikaryotic degradation
It was also found that the mean weight losses of Beech and Scots pine decayed
by Coriolus (T. versicolor) were 45.5 and 38.8%, respectively,
after 12 weeks incubation (Pandey and Pitman, 2003).
Weight loss of a soft wood (Pinus radiate) decayed by T. versicolor
was 22% and the biodegradation time was 77 days (Ferraz
et al., 2000). The results indicated that dikaryons have greater
cellular development than monokaryons due to dikaryons require more nutrients
than monokaryons and therefore, dikaryons possibly secreted high amounts of
extracellular enzymes during their fungal growth to produce much more glucose
molecules from the wood components that are need for cell growth. From the principle
of genetic systems, dikaryons contain two copies of enzyme genes (homologous),
when these genes are expressed the amount of enzymes produced must be twice
as much, more than the amount of enzymes produced by monokaryons. Hence, dikaryons
would have greater efficiency for wood degradation than monokaryons. In this
study, the results found that monokaryons were more efficient for wood degradation
than dikaryons, but the difference was not statistically significant. Addleman
and Archibald (1993) studied the delignification by monokaryons and dikaryons
of T. versicolor and found that delignification by monokaryons
was similar to dikaryons. Monokaryons and dikaryons of basidiomycetes, i.e.,
C. cinerea and P. igniarius, mostly produced equally amounts of
laccase enzymes (Srivilai, 2006), these results showed
that mycelial growth rate, pigments of mycelium, fruiting body and genetic system
would be important information for consideration of mycelium types for various
Undecayed wood and wood decayed by monokaryons and dikaryons: FTIR was
used to characterize the composition of the wood, both undecayed and decayed
by monokaryons and dikaryons, as shown in Fig. 2a-c.
Several studies have done on band assignment for wood samples. The broader signal
at ~3500 cm-1 indicated the presence of water vapor in the wood sample
powder, a band was observed at 3420 cm-1 (O-H stretching absorption),
a prominent C-H stretching vibration was around 2880 cm-1. The region
around 1800-600 cm-1 is known as the fingerprint region for wood.
Moreover, well defined peaks were assigned as follows: 1730 cm-1
(unconjugated C = O in hemicelluloses), 1645 cm-1 (absorbed O-H in
cellulose), 1500-1550 cm-1 (aromatic rings of lignin), 1458 and 1428
cm-1 (C-H deformation in cellulose and hemicelluloses), 1265 cm-1
(C-H stretching in lignin), 1117 and 1060 cm-1 (C-O stretching in
cellulose and hemicelluloses) and 877 cm-1 (C-H deformation in cellulose)
(Faix, 1992; Pandey, 1999; Pandey
and Pitman, 2003, 2004; Schwanninger
et al., 2004; Genestar and Palou, 2006;
Rana et al., 2010).
For Shorea wood decayed by monokaryons (Fig. 2b),
a peak showed the broader signal at~3500 cm-1 (peak 1), indicating
that the sample wood powder had water vapour. It is generally known that the
region between 1800 and 600 cm-1 is a fingerprint region for wood.
The fingerprint region 1 corresponding signal at 1710-1740 cm-1 (peak
number 2) indicated for the unconjugated C = O in hemicelluloses. The fingerprint
in region 2 signals at 1500-1600 cm-1 corresponding to peak numbers
3 and 4 were changed when compared to those of the undecayed Shorea wood.
The peak numbers 3 and 4 showed that lignin was degraded, particularly at a
peak around 1510 cm-1 that is frequently used as a reference band
of lignin changes (Berben et al., 1987; Friese
and Banerjee, 1992). The signals in fingerprint region 3 at 1400-1060 cm-1
corresponding to peak numbers 5, 6 and 7, fingerprint region 4 at 600-850 cm-1
corresponding to peak numbers 8, 9, 10 and 11 were found to be different from
those of undecayed Shorea wood. These results revealed that cellulose
and hemicelluloses polymers of wood cell wall were degraded.
||FTIR spectra of (a) Undecayed Shorea wood blocks (b)
Wood blocks decayed by monokaryon and (c) Wood blocks decayed by dikaryon,
after 12 weeks of incubation
The contents of the hemicelluloses and cellulose polymers could be calculated
from the carbohydrate composition of the wood by assuming that the glucose/mannose
ratio was 1:2 for hardwood glucomannan (1 mol of Glc/2 mol of Man).
Wave numbers at 814 cm-1, 870 cm-1, 872 cm-1
and 898 cm-1 are correlated with glucomannan, mannose, glucomannan
and cellulose, respectively (Kacurakova et al.,
2000; Bjarmestad and Dahlman, 2002). The results
showed that signals at 800 to 900 cm-1 were slightly changed and
it was possible that hemicellulose and cellulose polymers were partially degraded
even though Cambodian P. linteus is a white rot fungus.
For Shorea wood decayed by dikaryons (Fig. 2c) the
fingerprint regions 1, 2, 3 and 4 were changed. Many peaks (numbers 1 to 11)
in each fingerprint region decreased, but the intensity of some peaks increased.
The results indicated that the lignin in Shorea wood, which is a natural
phenolic compound was majorly degraded. Lignin polymers were broken down due
to the influence of the oxidative enzymes, such as manganese-peroxidase, lignin
peroxidase and laccase, which are produced by dikaryons during their growth
and formation of initial fruiting bodies. In previous study, Cambodian P.
linteus also produced a high amount of laccase, stimulated by copper
(Cu2) (Srivilai, 2006).
Interestingly, the fingerprint regions 1, 2, 3 and 4 of the Shorea wood
decayed by dikaryons were similar to those of Shorea wood decayed by
monokaryons. This result suggested that monokaryons and dikaryons may secrete
the same set of hydrolytic and oxidative enzymes during fungal incubation. These
enzymes caused the depolymerisation of lignin, cellulose and hemicelluloses
polymers, therefore simple sugar molecules were produced. However, some peaks
in fingerprint region 4 contained low signals, compared to the same peaks in
Shorea wood decayed by monokaryons. Interestingly, by a white rot fungus
(Phanerochaete velutina) cellulose and hemicelluloses were degraded at
the initial stage of wood degradation, i.e., 30 days after incubation. In contrast,
Stropharia rugosoannulata attacked cellulose but never exceeded the loss
of hemicelluloses. However, these fungi possibly produced predominant enzymes
namely, cellulase and manganese peroxidase. In general, lignin is a major natural
polyphenolic compound in wood, comprising about 20-30% of the dry mass. It is
mostly deposited in wood cell corners (Boerjan et al.,
2003; Gierlinger et al., 2004). In this
study, FTIR analysis revealed that the lignin, cellulose and hemicelluloses
were depolymerised due to changes in FTIR peaks compared to the FTIR reference
bands (Parker, 1983; Faix et
al., 1993; Bjarmestad and Dahlman, 2002; Ferraz
et al., 2000; Pandey and Pitman, 2003,
2004). During the period when the hyphae attacked the
wood, different types of hydrolytic enzymes could be liberated and alter the
complex cell wall components to become fungal energy sources. Pandey
and Pitman (2003) studied the chemical changes in beech wood decayed by
C. versicolor using FTIR and found that it decreased the intensities
of lignin and carbohydrate peaks, preferentially hemicelluloses (Pandey
and Pitman, 2003, 2004) (Fig. 2).
Observation of wood structural changes by SEM: Shorea wood blocks
decayed by monokaryons and dikaryons were examined for wood structural changes
by SEM. Each Shorea wood block sample was longitudinal and cross sectioned
and the results showed that undecayed Shorea wood blocks were not changed
and the Shorea cell walls were still intact. The outer layer of Shorea
wood blocks remained smooth, some wood pits were present and wood cell structures
were complete. Shorea wood block samples that were decayed by monokaryons
showed that the wood layers were changed. The longitudinal and cross section
views (Fig. 3c, d) showed that inside of
the wood tracheids there were numerous hyphae-deposited and the tracheid structures
were changed when compared to the undecayed wood tracheids (Fig.
3b). Also found that Shorea cell wall structures were decayed. According
to several studies, white rot fungi usually attack all the wood components simultaneously
(Fackler et al., 2007). In fact, white rot fungi
preferentially remove lignin from the entire cell wall causing the separation
of cells, especially when the middle lamella is extensively attacked. It has
been shown that white rot fungi were colonized on wood quickly and the ray parenchyma
cells are the first to be colonized. This observation revealed that fungal hyphae
penetrate from cell to cell via pit structures or bore holes through
the cell walls. Moreover, several factors influenced the wood degradation pattern,
for example, wood nitrogen content, temperature and humidity. However, the present
study also showed the changes in cell wall structures of wood that were decayed
by both monokaryons and dikaryons (Fig. 3). Unfortunately,
the differences were not very obvious in this study. For further study, the
biodegradation time could be extended in order to differentiate between undecayed
and decayed wood structures.
|| Undecayed Shorea wood structure was not changed and
the wood layer was smooth (a-b), whereas the hyphae penetrated the decayed
Shorea wood blocks and wood layers and changed their structures (c)
and (d) show monokaryotic mycelium penetrating tracheids. (e) and (f) show
dikaryotic mycelium penetrating tracheids and decaying Shorea cell
Cambodian P. linteus is a white rot fungus and used for the examination
of Shorea wood degradation. This fungus secreted hydrolytic enzymes to
decay wood components such as lignin, cellulose and hemicellulose. Monokaryons
and dikaryons have slightly different patterns in Shorea wood degradation.
However, the differences were not statistically significant. Cambodian P.
linteus monokaryons were a more appropriate mycelium for wood degradation,
some paper industrial processes and enzyme technology, due to its slowly growing
and easy management. Moreover, Cambodian P. linteus monokaryons did not
produced dark pigments from the fruiting body.
This study was supported by a grant from Mahasarakham University, Thailand.
Gracious thanks is extended to Ananyapron Prommettha for laboratory assistance
and Department of Biology for laboratory space and special thanks to Dr. Jolyon
Dodgson for the proof editing of English manuscript.
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