         β          !" !    # # $ " ! % # & !’!( ! % # )$ !’!( ! * # + ! ,- # , " ! ./ 0# $ " ! ,/ # 1 1 IBB  Instituto de Biotecnologia e Bioengenharia, Centro de Engenharia Biológica, Universidade do Minho, Campus de Gualtar 4710057 Braga, Portugal. Email: mimichelin@yahoo.com.br 2 Universidade de São Paulo  Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Departamento de Biologia 14040901 Ribeirão PretoSP, Brasil. 3 Universidade Tiradentes, Av. Murilo Dantas 300 Farolândia, 49032490 AracajuSE, Brasil 4 Instituto de Tecnologia e Pesquisa, Bloco ITP, 49032490 AracajuSE, Brasil )                                                         !     !        "             !       "      β#     A. ochraceus    $    $%    &                   &   "                   23 Xylanase; βxylosidase; Wheat Straw Autohydrolysis Liquor; Fermentation. 45)6%78465 Biomass from plant material is the most abundant and widely spread renewable raw material for the sustainable production of clean and affordable biofuels, biopower, and high value bioproducts. Lignocellulosic materials (LCM) from forest, agriculture, setaside lands, industry or urban solid wastes, mainly made up lignin, cellulose and hemicelluloses, are potential feedstocks for chemical utilization.