[1]尹增芳,樊汝汶.杨树筛管/伴胞复合体细胞程序性死亡的超微结构分析[J].南京林业大学学报(自然科学版),2007,31(05):001-5.[doi:10.3969/j.jssn.1000-2006.2007.05.001]
 YIN Zeng-fang,FAN Ru-wen.Ultrastructural Analyses on Programmed Cell Death on Sieve Element/Companion Cell Complex in Poplar[J].Journal of Nanjing Forestry University(Natural Science Edition),2007,31(05):001-5.[doi:10.3969/j.jssn.1000-2006.2007.05.001]
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杨树筛管/伴胞复合体细胞程序性死亡的超微结构分析
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《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

卷:
31
期数:
2007年05期
页码:
001-5
栏目:
研究论文
出版日期:
2007-05-20

文章信息/Info

Title:
Ultrastructural Analyses on Programmed Cell Death on Sieve Element/Companion Cell Complex in Poplar
文章编号:
1000-2006(2007)05-0001-05
作者:
尹增芳樊汝汶
南京林业大学森林资源与环境学院, 江苏 南京 210037
Author(s):
YIN Zeng-fang FAN Ru-wen
College of Forest Resource and Environment Nanjing Forestry University, Nanjing 210037, China
关键词:
筛管/伴胞复合体细胞程序性死亡超微结构美洲黑杨
Keywords:
SE/CC complex Cell programmed cell death Ultrastructure Populus deltoides
分类号:
S718
DOI:
10.3969/j.jssn.1000-2006.2007.05.001
文献标志码:
A
摘要:
<正>热压过程中热压温度和刨花含水率是两个决定木质复合材料产品性能的关键因素。为了深入分析热压过程中木质单元的复合机理,就热压温度和刨花含水率对刨花压缩特性的交互作用进行了研究。结果表明:刨花压缩应力-应变关系与木材的相似,热压温度和刨花含水率对其有显著的影响,而产生这种影响的原因主要是因为刨花的压缩模量是温度和含水率的函数。
Abstract:
The ultrastructural changes during the development of sieve element (SE)/companion cell (CC) complex (SE/CC complex) in Populus deltoides were investigated using electronic microscopy. The result showed that SE and CC come from the same secondary phloem mother cell. The development of sieve element went through three stages, i.e. immature, mature, and degenerate stage. In immature stage, the sieve element presented radial expansion, cell wall thickening, and production of sieve plastid and P-protein. The cytoplasma selectivly autolysed in mature stage. At the same time, karyoplasm was dispersed, and nuclear envelope was not clear, or karyoplasm was disorgnized, and nuclear envelope was clear. The karyopalsm finally turned into P-protein. In degenerate stage, the cytoplasm completely disappeared, and the function was lost. There was lots of organelle, such as ribsomes, mitochondria in companion cell during the mature stage of SE. Also the plasmodesmata appeared in cell wall between SE and CC. With decline of function in SE, the CC presented on a typical characteristic of programmed cell death. The endoplasm reticulum cisterna was enlarged, and so did perinuclear space. Synchronously, the chromatin condensed and aggregated towards the nuclear envelope. At last, the CC was disappeared completely. In conclusion, the development of secondary phloem SE underwent denucleation firstly. And the cytoplasm degenerated gradually after carrying out some physiological function. Simultaneously, the nuclear and cytoplasm of CC degenerated. We presume that SE and CC took the same programmed cell death procedure an intact function complex.
更新日期/Last Update: 2013-05-20