There are some sclerenchymatous cells outside the phloem of each vascular bundle to increase the supporting force of the petiole.
每个维管束的韧皮部外面有数层厚壁细胞，增加叶柄的机械支持作用。
2
Compared with inundatory condition, aerobic condition retarded the formation of aerenchyma of hybrid rice roots and made the cortex sclerenchymatous cells array loosely in conventional japonica root.