The shoot apical meristem of oil palm (Elaeis guineensis; Arecaceae): developmental progression and dynamics
The shoot apical meristem of oil palm (Elaeis guineensis; Arecaceae): developmental progression and dynamics
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DOI：
10.1093/aob/mcr019
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发表时间：
2011-12-01
期刊：
影响因子：
4.2
通讯作者：
Tregear, James W.
中科院分区：
文献类型：
--
作者：
Jouannic, Stefan;Lartaud, Marc;Tregear, James W.
背景与目的油棕榈是一种多年生不分枝的多年生单子叶植物，具有单茎顶端分生组织，负责植物整个地上结构的启动。为了与其他单子叶植物的SAM结构进行比较，并研究其结构在植物整个生命过程中的变化，从胚胎期到生殖植株的组织结构特征。方法采用染色组织切片、光学显微镜和共焦显微镜以及基于连续切片的三维重建相结合的方法对其结构进行研究。在成熟植株中，SAM的形状和体积会发生波动，这主要是由于中心区的变化，可能与叶片的启动有关。结论油棕榈SAM的发育是一个幼年到成熟的相变过程，同时伴随着带状格局的建立和形状的改变。SAM环带在塑胶期是动态的，与其他单子叶植物相比表现出明显的特征。
Background and Aims Oil palm, an unbranched perennial monocotyledon, possesses a single shoot apical meristem (SAM), which is responsible for the initiation of the entire above-ground structure of the plant. To compare the palm SAM structure with those of other monocots and to study variations in its structure throughout the life of the plant, its organization was characterized from the embryonic stage to that of the reproductive plant.Methods SAM structure was studied by a combination of stained histological sections, light and confocal microscopy, and serial section-based three-dimensional reconstructions.Key Results The oil palm SAM is characterized by two developmental phases: a juvenile phase with a single tunica-corpus structure displaying a gradual increase in size; and a mature phase characterized by a stable size, a modified shape and an established histological zonation pattern. In mature plants, fluctuations in SAM shape and volume occur, mainly as a consequence of changes in the central zone, possibly in relation to leaf initiation.Conclusions Development of the oil palm SAM is characterized by a juvenile to mature phase transition accompanied by establishment of a zonal pattern and modified shape. SAM zonation is dynamic during the plastochron period and displays distinct features compared with other monocots.