Ultrastructural patterns of beech leaf degradation by Sporotrichum pulverulentum

Rihani, Mohammed; Botton, Bernard; Villemin, G.; Abbouyi, Ahmed El

doi:10.1016/s1164-5563(01)01075-5

Cited by 4 publications

(4 citation statements)

References 37 publications

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“…It seems to be a common phenomenon, also reported for other fungi, such as Ceriporiopsis subvermispora and Cyathus stercoreus during the decomposition of lignocellulose belonging to herbaceous plants (Akin et al, 1995). Rihani et al (2001) reported a more complex mode of degradation of F. sylvatica by S. pulverulentum, in which hemicellulose and lignin of parenchyma cells and fibres were degraded concomitantly during early stages of invasion, whereas primary and secondary walls and middle lamella were attacked at more advanced stages of decay.…”

Section: Discussionmentioning

confidence: 55%

“…Owing to its chemical characteristics, the cuticle represents a natural barrier for the fungus, compelling the fungus to start the attack by way of the stomata or in ruptured zones; this phenomenon was also observed in Sporotrichum pulverulentum growing on leaves of Fagus sylvatica (Rihani et al, 2001). This confirms the need to use previously cut or mechanically damaged leaves as substrates in SSF to facilitate hyphae penetration.…”

Section: Discussionmentioning

confidence: 60%

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Degradation of pruning wastes by Phanerochaete sordida growing in SSF: Ultrastructural, chemical, and enzymatic studies

Diorio

Galati

García

et al. 2009

International Biodeterioration & Biodegradation

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Section: Discussionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 60%

Degradation of pruning wastes by Phanerochaete sordida growing in SSF: Ultrastructural, chemical, and enzymatic studies

Diorio

Galati

García

et al. 2009

International Biodeterioration & Biodegradation

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“…The results show that this method can effectively degrade the lignocellulose of CPS. A previous study found, using SEM, that the process of bacteria acting on wood can be divided into three processes: erosion, ditching, and drilling ( Rihani, Bottonb & Abbouyi, 2001 ). Bacteria first grow to the middle thin layer of wood cells, causing the erosion of fiber walls, and then grow, creating cavities, or ditches, in the cell wall.…”

Section: Discussionmentioning

confidence: 99%

Response surface methodology for the mixed fungal fermentation of Codonopsis pilosula straw using Trichoderma reesei and Coprinus comatus

Wei

Chen

et al. 2023

PeerJ

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The objective of this study was to investigate the cellulose degradation rate (CDR) and lignin degradation rate (LDR) of Codonopsis pilosula straw (CPS) and the optimal fermentation parameters for mixed fungal fermentation. Single-factor tests were used to study the effects of the fungal ratio (Trichoderma reesei: Coprinus comatus), fungal inoculum, corn flour content, and fermentation time on the degradation rate of cellulose and lignin. Based on the results of this experiment, the optimal fermentation factors were identified, and the effects of various factors and their interactions on the degradation rates of cellulose and lignin were further evaluated using the response surface method. The quadratic polynomial mathematical model of degradation rates of the cellulose and lignin in CPS by mixed fungus fermentation was established using Design Expert software v8.0.6. Under the optimal parameters for fungal fermentation of CPS straw (fungal ratio 4:6, fungal inoculum 8%, corn flour content 10%, fermentation time of 15 d), the CDR and LDR reached 13.65% and 10.73%, respectively. Collectively, the mixed fungal fermentation of CPS resulted in decreased lignin and cellulose content, better retention of nutrients, and enhanced fermentation quality. The results of this study indicate that fermentation using Trichoderma reesei and Coprinus comatus is a productive method for straw degradation, providing a theoretical basis for the development of CPS as feed.

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“…La première manifestation concerne les dégradations fongiques visibles dans la couche OL où l'on perçoit l'activité des basidiomycètes reconnaissables à leurs anses d'anastomose. Selon Reisinger et al (1978), confirmé récemment par Rihani et al (2001), ces champignons sont des agents efficaces de la fragmentation des pigments bruns intra-cellulaires, opaques aux électrons (photos 2 et 4, Fig. 2), supposés être des condensats de composés phénoliques et de protéines formés lors de la sénescence et précurseurs des substances humiques.…”

Section: Discussion Generaleunclassified

Evolution morphologique des litières de hêtre (Fagus sylvatica L.) et transformation des biopolymères, lignine et polysaccharides, dans un mull et un moder, sous climat tempéré (forêt de Fougères, Bretagne, France)

Karroum¹,

Guillet²,

Laggoun‐Défarge³

et al. 2005

Can. J. Soil. Sci.

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La litière est constituée par une matière organique peu évoluée dont la dégradation dans le mull s'effectue brusquement par l'intervention coïncidente des champignons de la pourriture blanche et des bactéries ainsi que celle des lombriciens. Dans le moder, les dégradations fongiques s'observent en OL et OF, puis en OH, l'activité bactérienne prend nettement le relais. En OH la lignine et les polysaccharides structuraux sont fortement dégradés, alors que se développent les polysaccharides microbiens. La dégrada-tion des lignines s'y manifeste par la décroissance du rapport syringiques/vanilliques et par l'augmentation du rapport acides/ aldhéhydes vanilliques. La teneur des polysaccharides chute fortement en A 1 où les observations en microscopie électronique révèlent l'existence d'une association intime entre les constituants organiques et minéraux dans le mull et une juxtaposition d'agrégats hérités dans le moder. Ces figures organo-minérales reflètent le rôle des activités majeures des vers de terre dans le mull et des enchytréides dans le moder. [405][406][407][408][409][410][411][412][413][414][415][416]. This study was conducted on a mull and a moder from two beech stands, 27 and 87 yr old, respectively, in the Fougères forest. In each stand, five profiles were subdivided in OL, OF and OH (moder only) layers and A 1 subhorizons. In the mull OL-OF layer, the organic matter was quickly degraded by white-rot fungi together with bacteria and earthworms. A fungal attack occurred in the moder OL and OF layers, whereas bacteria seemed efficient in the OF layer and especially so in the OH layer, where they appeared responsible for lignin and structural polysaccharide degradation. Lignin degradation was indicated by: (i) the decrease of all phenolic monomers, (ii) methoxyl group loss and (iii) an increase in the vanillic acid/aldhehyde ratio. The production of microbial exo-polysaccharides at the expense of the structural polysaccharides, revealed by an increase of the mannose/xylose ratio, was also supported by transmission electron microscopy observations. The decrease in the lignin phenols and structural polysaccharides continues in the underlying A 11 and A 12 layers. In the mull, earthworm activity results in a complex organo-mineral association, whereas in the moder, enchytraeid worm activity is responsible for mixing of inherited organic aggregates associated with minerals.Key words: Beech, forest humus, biologic activity, lignin, polysaccharides.Le développement des peuplements forestiers sur sol acide s'accompagne parfois d'une évolution des humus qui les fait passer du type mull initial, au type moder dans les peuplements âgés (Bernier et Ponge 1994). Cette évolution est généralement attribuée à un changement qualitatif et quantitatif des agents de la biodiversité, et notamment de ceux qui sont responsables de la dégradation et de la transformation des matières organiques (Ponge 2003). Ainsi le mull signale l'activité plus ou moins intense des vers de terre qui construisent un humus formé d'agrégats organ...

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Ultrastructural patterns of beech leaf degradation by Sporotrichum pulverulentum

Cited by 4 publications

References 37 publications

Degradation of pruning wastes by Phanerochaete sordida growing in SSF: Ultrastructural, chemical, and enzymatic studies

Degradation of pruning wastes by Phanerochaete sordida growing in SSF: Ultrastructural, chemical, and enzymatic studies

Response surface methodology for the mixed fungal fermentation of Codonopsis pilosula straw using Trichoderma reesei and Coprinus comatus

Evolution morphologique des litières de hêtre (Fagus sylvatica L.) et transformation des biopolymères, lignine et polysaccharides, dans un mull et un moder, sous climat tempéré (forêt de Fougères, Bretagne, France)

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