WOOD RESEARCH Volume 67, Number 2, 2022
WANWAN ZHAO, Liang Wen, Zhu Liu, RUI LIANG, Yaoli Zhang, ZHENHUA HUANG, and Liping Cai

Decay resistance of preservative injected poplar and its process of preventing white rot fungi infection

This study initially investigated decay resistance of preservative injected poplar and its infection mechanism of preventing white rot fungi. The living poplar was injected with different concentrations (0.0, 0.5, 1.0 and 1.5 wt.%) of alkaline copper quaternary (ACQ). Using the scanning electron microscopy, the process of preservative injected poplar wood preventing white rot fungi infection at different tree heights were examined. The decay resistance test results showed that the decay resistance of preservative injected poplar at different tree heights was significantly different. With the increase in tree height, the decay resistance decreased, and the higher the ACQ concentration, the better the decay resistance. The white rot fungi infested the poplar wood with the vessels as the breakthrough point, being spread to other cells through pits. The white rot fungi degraded wood cell walls by secreting enzymes and preferentially degraded the parenchyma cells.

WOOD RESEARCH Volume 65, Number 5, 2020
Zill-E-Huma Aftab, Shakil Ahmed, Arusa Aftab, Iffat Siddique, Muzammil Aftab, Zubaida Yousaf, and Farman Ahmed Chaudhry

Wood degrading mushrooms potentially strong towards laccase biosynthesis in Pakistan

In present study, Pleurotus ostreatus, Ganoderma lucidum, Ganoderma ahmadii, Ganoderma applanatum, Ganoderma australe, Ganoderma colossus, Ganoderma flexipes, Ganoderma resinaceum, Ganoderma tornatum, Trametes hirsutus, Trametes proteus, Trametes pubescens, Trametes tephroleucus, Trametes versicolor, Trametes insularis, Fomes fomentarius, Fomes scruposus, Fomitopsis semitostus, Fomes lividus, Fomes linteus, Phellinus allardii, Phellinus badius, Phellinus callimorphus, Phellinus caryophylli, Phellinus pini, Phellinus torulosus, Poria ravenalae, Poria versipora, Poria paradoxa, Poria latemarginata, Heterobasidion insulare, Schizophyllum commune, Schizophyllum radiatum, Daldinia sp., Xylaria sp., were collected, isolated, identified and then screened qualitatively for their laccase activity. Among all the collected and tested fungi Pleurotus ostreatus 008 and 016, Ganoderma lucidum 101,102 and 104 were highly efficient in terms of laccase production. The potent strains were further subjected to Quantitative laccase bioassay for partial purification and characterization of industrially important enzyme.