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植物胚后发育发生在分生组织，在那里干细胞自我更新和产生的子细胞，区分并产生不同的器官结构。对于分生组织的维持费用，子细胞分化的速率必须等于一代新细胞：如何实现这一点是在植物发育的一个主要问题。在拟南芥的根分生组织，干细胞包围一小群组织细胞，静态Together它们形成干细胞小生境[1，2]，其位置和活性取决于两组基因-PLETHORA1的组合动作（ PLT1）和PLETHORA2（PLT2）[3，4]和SCARECROW（SCR）与SHORTROOT（SHR）[2] - 以及对极性生长素运输。与此相反，控制分生组织细胞分化的机制仍不清楚。在这里，我们报告，细胞分裂素控制分生细胞分化的速度，从而通过双组分受体组氨酸激酶转录因子信号传导途径确定根分生组织大小。细胞分裂素的突变体，空间细胞分裂素耗竭，和外源细胞分裂素应用程序的根分生组织的分析表明，细胞分裂素作用在根分生组织，在那里它们拮抗非细胞自主性细胞分裂信号的受限区域，我们提供了证据，该信号是生长素。

Now the curtain had become family decorative fabric, conventional shading cloth shading performance is certain, but the lack of sense of beauty, the chemical coating treatment, not only poor air permeability, have peculiar smell, easy to aging, and volatile and fall off, not only affects the shading performance is not up to the requirements of environmental protection, its performance not Common jacquard fabric can show different patterns, but shading performance is not Double-layer weave jacquard curtain fabric is easy to wash and durable, good sound insulation effect, highly decorative, different yarn and organization matching may exhibit a variety of color, make the decorative cloth color is very rich, not only has the good performance and shading, can show a variety of flower type, fully meet the needs of This research is based on the analysis of fabric drape on shielding performance tests of the fabric By comparing different number group sample experimental results, a discussion on the relationship between different organizational structure factors and shielding properties of fabrics, to determine the optimum The experimental results show that, the fabric drape performance in general, but the shading performance excellent, composed of different materials of different weft yarn, weft density, different backing group, different nodes and different organizations such as the selection of jacquard curtain fabric shading performance due to different degrees of The bright yarn as raw material will be shading performance better than extinction wire, backing and surface microstructure has the same rules influence on fabric shading, shading performance is superior than plain satin twill, because increased with interleaving times, makes the yarn fabric bonded, thinning, leading to more light, showed that the fabric thickness is one of the most important factors affecting the shading At the same time, connecting nodes more uniform fabric the shading effect is