vascular bundle

ResultsThe root of Tylophora atrolliculata Metc. had amphicribral vascular bundle, however steme had bicollateral vascular bundle.

方法利用显微镜观察其根、茎的横切面结构与根粉末特征。

Collateral or bicollateral vascular bundle, developmental pith and medullary ray are obvious.

髓部发达，髓射线明显。

Male-sterility mainly results from the abnormality of mesospore,tapetum tissue and vascular bundle.

中、绒毡及药束异常均是雄性败育的因素。

Palisade tissue is rich in saliferous vacuoles, while vascular bundle sheath is obvious.

栅栏富含含盐液泡泡，束鞘明显。

Interfascicular cambium A single layer of actively dividing cells between the vascular bundles in stems.

束间形成是位于茎的束间的具有旺盛分裂能力的一细胞。