顶端分生组织

Maintenance of stem cell number in shoot apical meristem is essential for the generation of later organs.

植物顶端分生组织中干细胞数量的维持对于侧生器官的发生至关重要。

New cells are cut off on the lower side to form new stem tissue at the stem apex, and on both sides in the root apex to form root tissue and a protective root cap.

顶端分生组织产生的新细胞沿根或茎的长轴方向排列，沿其长轴方向增加细胞的数目。

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.

组织原学说：是由 Hanstein 提出的理论，认为顶端分生组织是由三个主要区域组成，表皮原、皮层原和中柱原，随后它们各自分化为表皮，皮层和中柱。

This work respectively studied the anatomical structure of shoot apices under a short-day photoperiod, a long-day photoperiod and a short-day―long-day photoperiod in the course of growing and developing.

在光学显微镜下观察，研究短日照、长日照、短日照-长日照处理的各个发育时期植株茎顶端分生组织的生长发育解剖结构变化。

The term is used particularly in relation to a part of the apical meristem that later differentiates further.

该名词也用于指随后进一步发育的顶端分生组织。

The outer layer of apical meristem, from which the epidermis is formed.

表皮原顶端分生组织的外层，表皮就是从这里形成的

Leaf buttress A leaf primordium, appearing as a protuberance on the side of the stem apex, produced by periclinal division of the tunica and corpus, and associated with a procambium.

叶原座：顶端分生组织上的侧生突起发育成叶的原基，与原形成层有关。

The floral primordium is initially circular, along with the edge of which slight concaves occur. The outmost whorl of tepal primordia arises as a result of apical meristem division and the floral primordium then is in the shape of triangle. Two further whorls of tepal primordia arise in spiral acropetal sequence and are alternately arranged. When the innermost whorl of tepal primordia is at the late developmental stage, the foremost stamen primordia arise almost simultaneously in spiral acropetal succession and all of the stamen primordia are ultimately arranged in a triangle-cone form. Late in stamen primordium development, carpel primordia arise as same as the young stamen primordia and grow laterally. Grooves are present on the adaxial side of each carpel and develop into ventral sutures gradually closing up.

观光木的花原基最初为近圆形，随着顶端分生组织的活动，花原基边缘处出现浅凹，形成第一轮花被片原基，此时，花原基呈三角形排列，后两轮花被片原基依次发生，与前一轮互生；在内轮花被片发生的后期，最初几枚雄蕊原基几乎同时出现，呈螺旋状向顶发生，最后排列成三角圆锥状；雄蕊原基发育后期，心皮原基开始发育，形状与发育初期的雄蕊原基相似，随后心皮原基进行侧向生长，在近轴面出现浅凹，进而发育为凹槽，形成腹缝线，最后腹缝线完全愈合。

The early research on cauliflower mutant of Arabidopsis thaliana and homeotic genes in cauliflower Brassica oleracea L.

花椰菜的花球在结构上由众多短缩的分枝组成，其表面有无数裸露的顶端分生组织。

Observations from the paraffin dissection showed that, the anatomical structures of treated upland rice root tip cells changed obviously, such as the arrangement confusion of cells from apical root meristem, quiescent center and root cap, increased middle lamella, the increased width and reduced elongation of cortex parenchyma cells, and the large numbers of slough off epidermis cells.

石蜡切片的结果表明，和对照相比，化感物质处理后的旱稻幼苗根尖的解剖结构发生了明显的变化，主要表现在顶端分生组织、静止中心和根冠的细胞排列混乱，细胞间隙加大，皮层薄壁组织细胞变得短而粗，以及表皮层细胞大量脱落等。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。