ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Species Diversity of Trichoderma Contaminating Shiitake Production Houses in Thailand)

ผู้เขียน:Charida Pukahuta, ดร.สาวิตรี ลิ่มทอง, ศาสตราจารย์, นางพูนพิไล สุวรรณฤทธิ์, รองศาสตราจารย์, Siengtong Nutalaya

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Abstract

From 38 samples of green fungal contaminated wood logs, sawdust in polypropylene bags and other related materials used for shiitake (Lentinula edodes (Berk.) Pegler) production collected from five shiitake production houses, 43 isolates of fungi produced green spores were obtained. Twenty seven of which belonged to genus Trichoderma (62.8%), 9 were Gliocladium (20.9%), 4 were Penicillium (9.3%) and 3 were Aspergillus (7.0%). Among Trichoderma, 22 isolates (81.5%) were identified as T. harzianum, 2 isolates (7.4%) were T. piluliferum and 1 isolate each (3.7%) was T. aureoviride, T. koningii and T. pseudokoningii. It was obvious that T. harzianum was the predominant species and widely distributed in shiitake production houses compared with the other 4 species. All isolates of T. harzianum did not show any resistance to a fungicide, benomyl.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 034, Issue 4, Oct 00 - Dec 00, Page 478 - 485 |  PDF |  Page

ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Combination of Laccase, Xylanase and Cellulase in Lignocellulose Degradation by White Rot Fungi, Lentinus polychrous Lev. and L. squarrosulus Mont.)

ผู้เขียน:Charida Pukahuta, นางพูนพิไล สุวรรณฤทธิ์, รองศาสตราจารย์, Emiko Shianagawa, Hisashi Hoshida, Yoshinori Nishizawa

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Abstract

The 22 isolates of white rot fungi, Lentinus spp. were screened for their activity of cellulase, xylanase and laccase. L. polychrous Lev. LP-PT-1 was cultured in 8 liquid media and 2 solid media. These 10 media were tested for lignocellulose degradation. Potato dextrose broth (PDB) and Fahraeus broth with 2 % rice straw (FRS) were selected as appropriate media. Both media were conducted to cultivate 4 isolates of L. polychrous Lev. LP-PT-1, LP-SW-3, LP-WR-13 and LP-UD-1 and 1 isolate of L. squarrosulus Mont.LS-YA. The xylanase and cellulase activities were determined at 40?C. Xylidine induced higher laccase actvity in 4 isolates, with the exception of LP-PT-1. LP-PT-1 produced three enzyme actvities in both PDB and FRS with and without xylidine addition. LP-SW-3 produced the highest activity of xylanase and laccase, 13.1 mU/ml and 3.27 U/ml, respectively, in FRS with xylidine addition. LP-SW-3, LP-WR-13 and LP-UD-1 showed the activity of three enzymes in FRS but lacked cellulase and/or xylanase activities in PDB. The production of xylanase of LP-SW-3 in FRS was induced by rice straw and of LP-UD-1 in PDB was induced by xylidine. LS-YA had the activity of all three enzymes in PDB but lacked xylanase activity in FRS without xylidine addition. FRS and xylidine addition was used to produce the culture broth for bleaching pulp. The increase in brightness of the treated pulp, 1.5-2.0 % higher than the control pulp, was correlated with the detected activity of xylanase of L. polychrous Lev.LP-PT-1, LP-UD-1 and L. squarrosulus Mont.LS-YA with low activity of laccase in each isolate. The high and moderate activity of xylanase with high and moderate activity of laccase in L. polychrous Lev. LP-SW-3 and LP-WR-13 did not increase the brightness of the treated pulp. It was concluded that these thermotolerant white rot fungi have the different combination of enzyme systems on lignocellulose degradation. The bleaching of pulp beneficially effected by the xylanase activity only when the activity of laccase was low.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 038, Issue 1, Jan 04 - Mar 04, Page 65 - 73 |  PDF |  Page