Department of Biology, University of York, Heslington, UK.
Planta. 1967 Sep;77(3):233-8. doi: 10.1007/BF00385293.
Microtubules have been shown to run around the perimeter of the pit aperture of developing bordered pits of Salix fragilis, L. These microtubules are parallel to the microfibrils being produced and do not converge with them. Although microtubules may be parallel to microfibrils in differentiating vessel elements as well as in fibres, many cases have been found where microtubules are not so orientated. There is no direct evidence for the involvement of microtubules in the orientation of microfibrils in the secondary wall, although their position during wall synthesis suggests some ancillary role.
微管被证明存在于发育中的萨柳薄皮木具缘纹孔的孔边缘周围，这些微管与正在生成的微纤丝平行，并不与它们汇聚。尽管微管可能与正在分化的导管分子以及纤维中的微纤丝平行，但也发现了许多微管没有这种取向的情况。虽然微管在次生壁微纤丝的取向中可能有一些辅助作用，但没有直接证据表明它们参与其中。
