林业科学研究
2012,25(4):425~431
Forest Research
文章编号:1001—1498(2012)04-0425-07
毛竹茎秆组织速生的时空发育特征
崔 凯 ,何彩云 ,张建国 ,廖声熙
(1.中国林业科学研究院资源昆虫研究所,云南 昆明
650224;
2.中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京
100091)
摘要:为探索毛竹从发笋到竹秆形成的组织发育规律,对不同发育时期和部位的毛竹茎秆进行组织解剖分析并进行
数量化分析。结果表明:竹秆的快速发育主要表现在节间的纵轴方向,节间发育由细胞分裂和细胞伸长控制。发育 初期,在薄壁细胞和纤维细胞上可以看到大量的细胞核出现,此时细胞分裂占主导地位;随着组织发育,细胞核逐渐 减少并消失,薄壁细胞和纤维细胞的长度显著增加,细胞伸长在发育中后期占主导地位。竹秆的发育、成熟和老化 从基部首先启动,中部和顶部要顺次晚一些。基部的纤维组织最先出现木质化,此时茎秆的高度大约为6 m。竹秆
的细胞伸长呈阶段性的波动,薄壁组织的细胞长度在快速伸长期偏离正态分布,在缓慢伸长期呈正态分布。 关键词:毛竹;茎秆;组织发育;解剖结构;细胞伸长 中图分类号:s795.7
文献标识码:A
Characteristics of Temporal and Spatial Tissue Development During the
Rapidly Growing Stage of Moso Bamboo Culms
CU/Kai ,HE Cai—yun ,ZHANG Jian—guo ,LIAO Sheng—xi。
(1.Research Institute of Resources Insects,Chinese Academy of Forestry,Kunming 650224,Yunnan,China;2.Research Institute of Forestyr,
Chinese Academy of Forestry:Key Laboratory of Forest Tree Breeding and Cultivation,State Forestyr Administration,Beijing 100091,China)
Abstract:To explore the development regularity from shoot to stem,the culms in different developmental stages and
portions of Moso bamboo(P lostachys heterocycla CV.pubescens)were studied by anatomy analysis.The results of
histological observations indicated that the rapid development of culms mainly presented in longitudinal direction,
which was dominated by cell division and cell elongation.In the initial stage of growth,numerous cell nuclei could
be seen in parenchyma and fiber cells--an obvious sign of cell division・・indicating the presence of meristematic tissue when cell division dominated the culms development.As the culm developed,the number of nuclei declined,until there were almost no detectable nuclei in the late stages of development.The development of culm was dominated by cell division in the initial stages and by cell elongation in the middle and late stages.The development,maturation and aging in different parts of the culm were studied systematically from the basal to the top internode.The lignifica— tion was appeared at fibrous tissue of basal internode in G7 stage when the length of culm was 6 m.The cell elonga— tion of culms showed periodic fluctuations.The cell length of parenchyma,in the rapid elongating stage,deviated rfom normal distribution while it showed normal distribution in the slow elongating stage.
Key words:Phfllostachys heterocycla CV.pubescens;culnls;tissue development;anatomical stucture;cell el