Effects of increased nitrogen supply on the lignification of poplar wood
Effects of increased nitrogen supply on the lignification of poplar wood
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DOI：
10.1021/jf071611e
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发表时间：
2007-12-12
影响因子：
6.1
通讯作者：
Lapierre, Catherine
中科院分区：
文献类型：
--
作者：
Pitre, Frederic E.;Pollet, Brigitte;Lapierre, Catherine
研究了适量氮肥和高氮肥对杨树木质化的短期影响。较高的氮素供应减少了新形成的次生木质部中木质素的染色，表明木质素的沉积受到影响。乙酰溴测定木质素含量下降9-10%，但Klason木质素含量不变。硫代酸解结果表明，氮素供给量的增加影响了木质素的结构，使得参与β-O-4键的木素单元频率降低，紫丁香基/愈创木基比降低，对羟基苯基木素单元频率增加，更多的愈创木基单元带有游离酚基，更多的对羟基苯甲酸酯连接到杨木木质素上。这些特征表明，生长在高氮条件下的杨树木质素与木材发育早期形成的木质素具有结构上的相似性。研究结果还表明，重力刺激导致木材张力的形成和高氮素利用率导致木质素含量和结构的相似和相加效应。
The short-term influence of adequate and high nitrogen fertilization on poplar lignification was investigated. The high nitrogen supply decreased lignin staining in the newly formed secondary xylem, indicating that lignin deposition was affected. Acetyl bromide determinations gave a 9-10% decrease in lignin content; however, Klason lignin content was unchanged. Thioacidolysis showed that elevated N supply affected lignin structure such that there was a reduced frequency of lignin units involved in beta-O-4 bonds, a reduced syringyl/guaiacyl ratio, an increased frequency of p-hydroxyphenyl lignin units, more guaiacyl units with free phenolic groups, and more p-hydroxybenzoic acid ester-linked to poplar lignins. These features suggest that lignins from poplars grown under high N bear structural similarities to lignins formed during early stages of wood development. The findings also indicate that a gravitational stimulus inducing the formation of tension wood and high N availability lead to similar and additive effects on lignin content and structure.