MAP18调控根毛顶端生长的新机制

来源 :2016全国植物生物学大会 | 被引量 : 0次 | 上传用户:yh603469940
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  根毛是典型的进行顶端生长的细胞,在植物水分与养分的吸收过程中发挥重要作用。根毛细胞极性的建立和维持对于根毛的顶端生长和形态建成至关重要。前人的研究发现植物中特有的小G蛋白ROP2调控根毛的生长发育。然而对于这一过程中ROP2活性的调控还知之甚少。我们前期的研究发现,在营养组织细胞中通过去稳定徼管调控细胞极性生长的微管结合蛋白MAP18具有Ca2+依赖的微丝切割活性,在花粉管中通过作用于微丝调控花粉管顶端生长的方向。进一步的研究发现,MAP18在根毛的顶端生长过程中也发挥重要作用,通过调控微丝影响根毛细胞核的定位以及根毛的极性建立和顶端生长。更为有趣的是MAP18能与ROP2结合,参与了ROP2对根毛生长发育的调控。本研究解析了MAP18调控ROP2信号途径和根毛顶端生长的新机制。
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