Histogen theory A theory, proposed by Hanstein, in which the apical meristem is considered to consist of three main zones, the dermatogen, periblem, and plerome, which differentiate into the epidermis, cortex, and stele respectively.

組織原學(xué)說：是由 Hanstein 提出的理論，認(rèn)為頂端分生組織是由三個主要區(qū)域組成cao美女视频，表皮原、皮層原和中柱原，隨后它們各自分化為表皮日本亚洲黄色网站免费，皮層和中柱。

Stellar arrangements vary considerably in plants from the simple protostele, in which leaf gaps are absent, to the complex dictyostele, in which there are many closely spaced LEAF GAPS.

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Stele The vascular tissue and associated parenchyma tissue and the surrounding pericycle and endodermis of a stem or root.

中柱：包括根或莖的維管組織及相關(guān)薄壁組織，若有維管束鞘和內(nèi)皮包被則這二者也屬于中柱結(jié)構(gòu)高清无码免费在线观看视频。

After the structure was optimized, the intensity utilization coefficient of horizontally side-post, arch steel tube and mid-post increased 18%, 3%and 25%respectively, the vertically side-post which was utilized insecurely and insatiably utilized securely, stably, and reasonably, and steel of main body was saved about 3.7%.

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Surrounding the central cylinder is the pericycle.

圍繞中柱的是中柱鞘亚洲va在线va天堂XXxX国产。

Eustele The STELE arrangement found in most gymnosperms and dicotyledons in which the vascular tissue is arranged into a ring of discrete bundles separated by medullary rays, all contained within a single ring of endodermis and pericycle.

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Centrarch Denoting a protostsele in which protoxylem is at the center of the axis.

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Another experimental program is conducted, which purpose is to study the behavior of slab-column connections with nonrectangular columns subjected to earthquake forces.

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In functional study, overexpression assay was conducted in potato. Interestingly, tuberous swelling along roots was observed in some transgenic potato lines in addition to stem-derived tuber formation. Conclusively, we propose a hypothesis to illustrate the mechanism by which IbMADS1 participates in the initiation of tuberization in sweet potato.

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