麻竹节间伸长过程的初步研究

竹子秆茎的快速生长是禾本科生物学的一个未解之谜，而秆茎的生长又是以节间为单位进行的。本研究以第8节为标准节，利用统计学及石蜡切片的方法，获得了麻竹的节间伸长曲线以及节间组织发育的形态解剖信息。麻竹节间的伸长呈现“慢-快”的生长趋势，早期节间以细胞分裂为主，然后节间由上到下逐渐进入细胞伸长阶段，最后节间停止伸长进入成熟生长阶段。本研究为大型丛生竹节间发育的研究提供了基础数据，有助于推动对竹子笋株快速生长机制的研究。

A Pilot Study on Internode Elongation in a Paleotropical Bamboo,Dendrocalamus latiflorus (Poaceae: Bambusoideae)

The rapid growth of bamboo culms at the juvenile stage is still an unresolved scientific issue in grass biology. In this study, we selected the eighth node as the standard node to investigate internode development in the paleotropical bamboo species, Dendrocalamus latiflorus. An elongation curve and anatomical features of the eighth internode were determined using statistical methods and a paraffin section technique, respectively. Internode elongation was found to show a “slow fast” trend. During early stages of internode development, most cells divided quickly, but then gradually stopped dividing before elongating in a top down orientation between the nodes. Finally, cells forming the internode stopped elongating and became mature. This is the first report on internode development of a large sized paleotropical bamboo species, and should promote further research on rapid growth of bamboo shoots.