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Pak. J. Bot., 49(1): 187-200, 2017.

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DEVELOPMENTAL CHARACTERISTICS OF PARENCHYMA AND FIBER CELLS

AND THEIR SECONDARY WALL DEPOSITION IN FARGESIA YUNNANENSIS

SHU-GUANG WANG¹, CHENG-BIN WAN^2Ɵ, HUI ZHAN^1Ɵ, SHU-YAN LIN^3Ɵ AND YU-LONG DING^3*

¹School of Life Sciences, Southwest Forestry University, Kunming, Yunnan 650224, P.R. China

²College of Foreign Languages, Southwest Forestry University, Kunming, Yunnan 650224, P.R. China

³Bamboo Research Institute, Nanjing Forestry University, Nanjing, Jiangsu 210037, P.R. China

^*Corresponding author’s email: ylding@vip.163.com; Tel: +86-25-85427787

^ƟCheng-Bin Wan, Hui Zhan and Shu-Van Lin contributed equally to this work

Abstract

The aim of this study is to describe and analyse the morphological characteristics of nuclei and the secondary wall deposition in parenchyma and fiber cells during the whole bamboo growth cycle from shoots to old culms, with a further purpose to assess the developmental differences between fibers and parenchyma cells and analyze the secondary wall deposition mechanism. Initially the fiber wall thickness was less than the parenchyma cell thickness in young shoots, but increased significantly after 1 year. Fibers elongated earlier than both their nuclei and parenchyma cells. Fiber nuclei also elongated and presented the spindle shape in longitudinal section. The formation and elongation of long cells were involved in the fast elongation of internodes. In mature culms, the ways of secondary wall deposition for fibers depended on their diameter and positions. Large diameter fibers usually had more cell wall layers than narrow fibers.

Key words: Culm development, Cell nucleus, Cell elongation, Secondary wall deposition.