TEM study of wound-induced vessel occlusions in European Ash (Fraxinus excelsior L.)

被引:11
作者
Schmitt, U
Richter, HG
Muche, C
机构
[1] Fed. Res. Ctr. Forest. Forest Prod., Inst. Wood Biol. and Wood Protect., D-21031 Hamburg
关键词
Fraxinus excelsior L; transmission electron microscopy; wounding; vessel occlusion;
D O I
10.1163/22941932-90001505
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Vessel occlusions in branches of Fraxinus excelsior L. were investigated by means of transmission electron microscopy. The vessel occlusions are fanned by exudates released from adjacent ray and axial parenchyma cells through the intact pit membranes. initial stages mostly display balloon-like structures protruding from the pit aperture into the vessel lumen. These inclusions possess a very electron dense outer membrane and dispersed exudates in their interior. Therefore, the vessel occlusions in F. excelsior do not represent true tyloses.
引用
收藏
页码:401 / 404
页数:4
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