Animal Nutrition Group, Wageningen University & Research, Wageningen, The Netherlands.
Laboratory of Food Chemistry, Wageningen University & Research, Wageningen, The Netherlands.
J Sci Food Agric. 2019 Jan 30;99(2):957-965. doi: 10.1002/jsfa.9320. Epub 2018 Oct 16.
This study investigated the ruminal degradability of various wheat straw types by the white-rot fungi Ceriporiopsis subvermispora (CS) and Lentinula edodes (LE). Different cultivars (CV) of wheat straw at different maturity stages (MS) were treated with the fungi for 7 weeks and assessed for chemical composition and in vitro gas production (IVGP).
Both fungi showed a more pronounced degradation of lignin on a more mature straw (MS3; 89.0%) in comparison with the straw harvested at an earlier stage (MS1; 70.7%). Quantitative pyrolysis coupled to gas chromatography and mass spectrometry, using C lignin as an internal standard C-IS Py-GC/MS revealed that lignin in more mature straw was degraded and modified to a greater extent. In contrast, cellulose was less degraded in MS3, as compared to MS1 (8.3% versus 14.6%). There was no effect of different MS on the IVGP of the fungus-treated straws. Among the different straw cultivars, the extent of lignin degradation varied greatly (47% to 93.5%). This may explain the significant (P < 0.001) effect of cultivar on the IVGP of the fungal-treated straws. Regardless of the factors tested, both fungi were very capable of improving the IVGP of all straw types by 15.3% to 47.6%, (as compared to untreated straw), with CS performing better than LE - on different MS (33.6% versus 20.4%) and CVs (43.2% versus 29.1%).
The extent of lignin degradation caused by fungal treatment was more pronounced on the more mature and lignified straw, while variable results were obtained with different cultivars. Both fungi were capable of improving the IVGP of various straw types. © 2018 The Authors. Journal of the Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
本研究通过白腐真菌糙皮侧耳（CS）和香菇（LE）研究了不同小麦秸秆类型的瘤胃降解性。将不同品种（CV）的不同成熟阶段（MS）的小麦秸秆用真菌处理 7 周，然后评估其化学成分和体外产气量（IVGP）。
两种真菌在更成熟的秸秆（MS3；89.0%）上显示出更明显的木质素降解，而在更早阶段（MS1；70.7%）收获的秸秆上则更为明显。使用 C 木质素作为内标 C-IS Py-GC/MS 的定量热解与气相色谱和质谱联用表明，较成熟秸秆中的木质素降解和修饰程度更大。相比之下，与 MS1（8.3%对 14.6%）相比，MS3 中的纤维素降解程度较低。不同 MS 对真菌处理秸秆的 IVGP 没有影响。在不同的秸秆品种中，木质素降解程度差异很大（47%至 93.5%）。这可能解释了品种对真菌处理秸秆 IVGP 的显著影响（P<0.001）。无论测试的因素如何，两种真菌都非常能够提高所有秸秆类型的 IVGP，提高幅度为 15.3%至 47.6%（与未处理的秸秆相比），CS 的效果优于 LE-在不同 MS（33.6%对 20.4%）和 CVs（43.2%对 29.1%）上。
真菌处理引起的木质素降解程度在更成熟和木质化的秸秆上更为明显，而不同品种的结果则有所不同。两种真菌都能够提高各种秸秆类型的 IVGP。©2018 作者。约翰威立父子公司出版的《食品科学杂志》代表化学工业协会出版。
