Effect of Lignin Content and Subunit Composition on Digestibility in Clones of Timothy (Phleum pratense L.)

被引：8

作者：

Karkonen, Anna ^{[1
]}

Tapanila, Tarja ^{[2
]}

Laakso, Tapio ^{[2
]}

Seppanen, Mervi M. ^{[1
]}

Isolahti, Mika ^{[3
]}

Hyrkas, Maarit ^{[4
]}

Virkajarvi, Perttu ^{[4
]}

Saranpaa, Pekka ^{[2
]}

机构：

[1] Univ Helsinki, Dept Agr Sci, FI-00014 Helsinki, Finland

[2] Finnish Forest Res Inst, METLA, FI-01301 Vantaa, Finland

[3] Boreal Plant Breeding Ltd, FI-31600 Jokioinen, Finland

[4] MTT Agrifood Res Finland, FI-71750 Maaninka, Finland

来源：

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2014年 / 62卷 / 26期

关键词：

cell wall; digestibility; ferulic acid; lignin amount; lignin subunit composition; lignin linkage structure; timothy; PRIMARY GROWTH; NUTRITIVE-VALUE; TALL FESCUE; CELL-WALLS; REGROWTH; GRASSES; DEGRADABILITY; LIGNIFICATION; IMPROVEMENT; PREDICTION;

D O I：

10.1021/jf5016494

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

Lignin amount and subunit composition were analyzed from stems and leaf sheaths of timothy (Phleum pratense L.) clones of different in vitro digestibility. Lignin concentration in stems and leaf sheaths was higher in clones of low digestibility than those of high digestibility. No change in lignin concentration occurred in stems as digestibility decreased. Intriguingly, the lignin concentration was lower and the syringyl/guaiacyl (S/G) ratio was higher in stems compared to leaf sheaths at all developmental stages studied. The developmental-associated decrease in digestibility correlated with the increase in S units in lignin in stems and leaf sheaths and in the amounts of p-coumaric acid and ferulic acid residues in the cell wall of stems. Yields of copper oxidation products increased in stems during maturation indicating qualitative changes in the lignin structure. This correlated strongly with the developmentally linked decrease in digestibility. The information obtained is valuable for breeding and for DNA marker development.

引用

页码：6091 / 6099

页数：9

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