厚竹高生长过程中竹秆淀粉粒的变化规律
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HU Tianyi1,2, XU Tingting1,2, WEI Qiang3, YANG Guangyao1,2, YU Fen1,2* (1 江西农业大学 林学院南昌3300452 江西省竹子种质资源与利用重点实验室南昌3300453 南京林业大学竹类研究所南京 210037) 
基金项目:国家自然科学基金(31960336,31460177);
中文摘要:为揭示厚竹(Phyllostachys edulis ‘Pachyloen’)快速高生长的物质基础,进一步探究厚竹快速高生长的物质代谢机理。该研究采用常规石蜡切片结合光学显微技术,研究厚竹高生长过程中竹秆淀粉粒的时空动态变化规律。结果表明:(1)淀粉粒随着竹秆的高生长逐渐减少,且同一节间的不同部位淀粉粒的含量存在差异;在轴向上,同一节间从上至下淀粉粒含量升高,节间基部的淀粉粒最多,且节部的淀粉粒含量始终高于节间;高生长停止后,在节部的长、短细胞中仍有淀粉粒分布。(2)在径向上,从外至内,淀粉粒逐渐减少,且维管束周围淀粉粒明显多于其他部位。(3)节隔缺失的异常节间和节部的淀粉粒含量较正常的多,且节间各部位淀粉粒含量相似。研究发现,淀粉粒的时空动态变化与厚竹高生长过程中节间细胞的发育规律一致,节部可能主要通过控制物质运输来调控竹子的高生长。
中文关键词:厚竹  高生长  淀粉粒  竹秆  节部
 
Starch Granule Changes in Bamboo Shoots during the Elongation Growth of Phyllostachys edulis ‘Pachyloen’
Abstract:To reveal the material basis of Phyllostachys edulis ‘Pachyloen’ fast growth, and to further explore the mechanisms of fast growth of Ph. edulis ‘Pachyloen’, we used paraffin sections combined with optical microscopy techniques to study the temporal and spatial dynamics of starch granules in bamboo culms during the elongation growth of Ph. edulis ‘Pachyloen’. The results showed that: (1) the content of starch granules gradually decreased during the elongation growth of bamboo culms. In individual internodes, the content of starch granules varied from site to site. In the axial direction, the content of starch granules from top to bottom in the same internode increased, and the highest was at the base of the internode. The content of starch granules in nodes was always higher than that in internodes. After the elongation growth ceased, there were still starch granules in the long and short parenchyma cells. (2) In the radial direction, the starch granules gradually decreased from the outside to the inside, and there were obviously more starch granules around the vascular bundle than in other parts. (3) Abnormal diaphragm led more starch granules in the culms and similar content of starch granules in each part of the internodes. The temporal and spatial dynamics of starch granules are consistent with the development of internode cells during the growth of Ph. edulis ‘Pachyloen’, and the nodes might regulate the elongation growth of bamboo mainly by controlling material transportation.
keywords:Phyllostachys edulis ‘Pachyloen’  elongation growth  starch granule  culm  node
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