Commelinid Monocotyledon Lignins Are Acylated by p-Coumarate
Commelinid Monocotyledon Lignins Are Acylated by p-Coumarate
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DOI：
10.1104/pp.18.00298
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发表时间：
2018-06-01
期刊：
影响因子：
7.4
通讯作者：
Harris, Philip J.
中科院分区：
文献类型：
--
作者：
Karlen, Steven D.;Free, Heather C. A.;Harris, Philip J.
鸭嘴草属单子叶植物是一个单系分支，通过存在细胞壁结合的阿魏酸和对香豆酸而与其它单子叶植物区分开。禾本科或禾本科是这一组的成员，并且该家族的细胞壁中的大多数对香豆酸酯酰化木质素。在这里，我们分离和检查ligandercell壁制剂从10种鸭茅类单子叶植物从9个家庭以外的禾本科，包括物种从所有4个鸭茅类单子叶植物的订单（禾本科，鸭茅目，和Aesthies）。我们发现，在禾本科，木质素连接的p-香豆酸只发生在羟基上的γ-碳的木质素单元侧链，主要是对辛基单位。虽然在这些物种中还没有直接研究酰化的机制，但它可能与禾本科中的酰化机制相似，并且涉及BAHD酰基辅酶A：单甘酯转移酶。
Commelinid monocotyledons are a monophyletic clade differentiated from other monocotyledons by the presence of cell wall-bound ferulate and p-coumarate. The Poaceae, or grass family, is a member of this group, and most of the p-coumarate in the cell walls of this family acylates lignin. Here, we isolated and examined lignified cell wall preparations from 10 species of commelinid monocotyledons from nine families other than Poaceae, including species from all four commelinid monocotyledon orders (Poales, Zingiberales, Commelinales, and Arecales). We showed that, as in the Poaceae, lignin-linked p-coumarate occurs exclusively on the hydroxyl group on the gamma-carbon of lignin unit side chains, mostly on syringyl units. Although the mechanism of acylation has not been studied directly in these species, it is likely to be similar to that in the Poaceae and involve BAHD acyl-coenzyme A: monolignol transferases.