@article{PAR00001321, title = {{T}ension wood and opposite wood in 21 tropical rain forest species 2. {C}omparison of some anatomical and ultrastructural criteria}, author = {{R}uelle, {J}. and {C}lair, {B}. and {B}eauchene, {J}. and {P}r{\'e}vost, {M}arie-{F}ran{\c{c}}oise and {F}ournier, {M}.}, editor = {}, language = {{ENG}}, abstract = {{T}he anatomy of tension wood and opposite wood was compared in 21 tropical rain forest trees from 21 species belonging to 18 families from {F}rench {G}uyana. {W}ood specimens were taken from the upper and lower sides of naturally tilted trees. {M}easurement of the growth stress level ensured that the two samples were taken from wood tissues in a different mechanical state: highly tensile-stressed wood on the upper side, called tension wood and normally tensile-stressed wood on the lower side, called opposite wood. {Q}uantitative parameters relating to fibres and vessels were measured on transverse sections of both tension and opposite wood to check if certain criteria can easily discriminate the two kinds of wood. {W}e observed a decrease in the frequency of vessels in the tension wood in all the trees studied. {O}ther criteria concerning shape and surface area of the vessels, fibre diameter or cell wall thickness did not reveal any general trend. {A}t the ultrastructural level, we observed that the microfibril angle in the tension wood sample was lower than in opposite wood in all the trees except one ({L}icania membranacea).}, keywords = {tension wood ; opposite wood ; tropical rain forest ; vessels ; wood anatomy ; wood fibre}, booktitle = {}, journal = {{I}awa {J}ournal}, volume = {27}, numero = {4}, pages = {341--376}, ISSN = {0928-1541}, year = {2006}, URL = {https://www.documentation.ird.fr/hor/{PAR}00001321}, }