He Yuan, Mouthier Thibaut Mb, Kabel Mirjam A, Dijkstra Jan, Hendriks Wouter H, Struik Paul C, Cone John W
Animal Nutrition Group, Wageningen University & Research, 6700 AH Wageningen, the Netherlands.
Food Chemistry, Wageningen University & Research, 6700 AA Wageningen, the Netherlands.
J Sci Food Agric. 2018 Jan;98(1):384-390. doi: 10.1002/jsfa.8630. Epub 2017 Sep 25.
The relationship between the chemical and molecular properties - in particular the (acid detergent) lignin (ADL) content and composition expressed as the ratio between syringyl and guaiacyl compounds (S:G ratio) - of maize stems and in vitro gas production was studied in order to determine which is more important in the degradability of maize stem cell walls in the rumen of ruminants. Different internodes from two contrasting maize cultivars (Ambrosini and Aastar) were harvested during the growing season.
The ADL content decreased with greater internode number within the stem, whereas the ADL content fluctuated during the season for both cultivars. The S:G ratio was lower in younger tissue (greater internode number or earlier harvest date) in both cultivars. For the gas produced between 3 and 20 h, representing the fermentation of cell walls in rumen fluid, a stronger correlation (R = 0.80) was found with the S:G ratio than with the ADL content (R = 0.68). The relationship between ADL content or S:G ratio and 72-h gas production, representing total organic matter degradation, was weaker than that with gas produced between 3 and 20 h.
The S:G ratio plays a more dominant role than ADL content in maize stem cell wall degradation. © 2017 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
研究了玉米茎的化学和分子特性——特别是（酸性洗涤）木质素（ADL）含量以及以紫丁香基与愈创木基化合物之比（S:G比）表示的组成——与体外产气之间的关系，以确定在反刍动物瘤胃中玉米茎细胞壁降解过程中哪个因素更为重要。在生长季节收获了两个对比鲜明的玉米品种（安布罗西尼和阿斯塔）的不同节间。
茎内节间数越多，ADL含量越低，而两个品种的ADL含量在季节中均有波动。两个品种中，较幼嫩组织（节间数更多或收获日期更早）的S:G比更低。对于3至20小时产生的气体，代表瘤胃液中细胞壁的发酵，发现其与S:G比的相关性更强（R = 0.80），而与ADL含量的相关性为（R = 0.68）。ADL含量或S:G比与代表总有机物质降解的72小时产气之间的关系，比与3至20小时产生的气体之间的关系更弱。
在玉米茎细胞壁降解过程中，S:G比比ADL含量发挥更主导的作用。© 2017作者。《食品与农业科学杂志》由约翰·威利父子有限公司代表化学工业协会出版。
