Moya Róger, Tomazello Fo Mario
Escuela de Ingenieria Forestal, Instituto Tecnológico de Costa Rica, Apartado 159-7050, Cartago, Costa Rica.
Rev Biol Trop. 2008 Jun;56(2):689-704. doi: 10.15517/rbt.v56i2.5617.
The tree Gmelina arborea has been widely introduced in Costa Rica for commercial purposes. This new conditions for melina cause variations on anatomy in secondary xylem of the trees growing in plantations. The objective of the present research was to determine the variation in the anatomy of xylem caused by the ecological conduction variation. Dimensions of fiber, axial parenchyma percentage of cross sections, parameters of vessels and the ray were measured. The results showed that some anatomical characteristics remained stable despite variations of ecological conditions, especially radial parenchyma and anatomical features which were less affected by the altitude. On the other hand, the vessels, axial parenchyma and fiber were less stable because they were affected significantly by the longitude, latitude, altitude and precipitation. Latitude significantly affected vessel percentage, length and diameter of the fiber and lumen. Longitude affected vessel percentage and fiber diameter. Altitude had a significant correlation with the amount of cells at ray height. Annual average precipitation affected vessel percentage and diameter, not only of the fiber, but also of the lumen. These results suggest that the new growth conditions of G. arborea trees in Costa Rica have produced an anatomic adaptation.
乔木山黄麻已为商业目的而被广泛引入哥斯达黎加。山黄麻的这种新生长环境导致种植园中树木次生木质部的解剖结构发生变化。本研究的目的是确定由生态条件变化引起的木质部解剖结构的变化。测量了纤维尺寸、轴向薄壁组织在横切面上的百分比、导管参数和射线参数。结果表明，尽管生态条件有所变化，但一些解剖特征保持稳定，尤其是径向薄壁组织以及受海拔影响较小的解剖特征。另一方面，导管、轴向薄壁组织和纤维不太稳定，因为它们受到经度、纬度、海拔和降水量的显著影响。纬度显著影响导管百分比、纤维长度和直径以及管腔。经度影响导管百分比和纤维直径。海拔与射线高度处的细胞数量有显著相关性。年平均降水量不仅影响纤维的导管百分比和直径，还影响管腔的导管百分比和直径。这些结果表明，哥斯达黎加山黄麻树的新生长条件产生了解剖学适应性。
