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毛竹茎秆组织速生的时空发育特征
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Journal Article
毛竹茎秆组织速生的时空发育特征
2012
Overview
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。
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