Toward understanding the different function of two types of parenchyma cells in bamboo culms
Toward understanding the different function of two types of parenchyma cells in bamboo culms
复制标题
旨在了解竹秆中两种薄壁细胞的不同功能。
DOI：
10.1093/pcp/pcf027
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发表时间：
2002-02-01
影响因子：
4.9
通讯作者：
Itoh, T
中科院分区：
文献类型：
--
作者：
He, XQ;Suzuki, K;Itoh, T
与水稻、玉米和其他主要作物种类的薄壁细胞单一类型相比，木质单子叶植物竹子的茎基部组织有两种薄壁细胞。利用光镜、紫外显微镜、透射电镜和免疫标记技术，研究了毛竹不同发育阶段细胞壁组分木质素、（1—bbb3）、（1—bbb4）- β - d -葡聚糖（mg）、高取代糖醛酸阿拉伯木聚糖（hsGAXs）和低支木聚糖（lbXs）在毛竹不同发育阶段的分布。2月龄竹子的短薄壁细胞壁与长薄壁细胞壁一样木质化。木质化区域仅限于与长薄壁细胞壁接触的部分，而细胞角区细胞壁从未木质化，即使在7年生的茎中也是如此。短薄壁细胞壁和长薄壁细胞壁的半纤维素分布也有显著差异。在竹材薄壁组织中，mg主要分布在短薄壁细胞壁，而在长薄壁细胞壁中发现的mg较少。hsgax在幼茎中的分布与mg相似，但只出现在老茎短薄壁细胞的细胞角区。低分枝木质素主要分布在木质化的薄壁细胞壁中，而非木质化的薄壁细胞壁中。在此基础上，讨论了竹竿短薄壁细胞和长薄壁细胞在功能上的差异。
The bamboo, woody monocot, has two types of parenchyma cells in the ground tissues of its culm, in contrast to a single type of parenchyma cell in rice, maize and other major crop species. The distribution of cell wall components, including lignin, (1-->3), (1-->4)-beta-D-glucans (MGs), the highly-substituted glucuronoarabinoxylans (hsGAXs) and low-branched xylans (lbXs) in ground parenchyma tissue of Phyllostachys heterocycla var. pubescens culms was studied at various developmental stages using light microscopy (LM), UV-microscopy, transmission electron microscopy (TEM) and immunolabeling techniques. The short parenchyma cell walls were lignified in 2-month-old bamboo culms just as the long parenchyma cell walls were. The lignified regions were confined to the portions in contact with the long parenchyma cell walls, while the walls at the cell corner region never lignified, even in 7-year-old culms. Significant differences were also found in the hemicellulose distribution between the short and long parenchyma cell walls. In bamboo parenchyma tissue, MGs were localized in short parenchyma cell walls and few were found in long parenchyma cell walls in both young and 7-year-old culms. The distribution of hsGAXs was similar to that of MGs in young culms, but they only appeared in the cell corner region of short parenchyma cells in old culms. Low-branched xylans were distributed in the lignified, but not in unlignified parenchyma cell walls. Based on this evidence, the differences of function in both short and long parenchyma cells in a bamboo culm are discussed.