Glover B J, Perez-Rodriguez M, Martin C
Department of Genetics, John Innes Centre, Norwich Research Park, Colney, NR4 7UH, UK.
Development. 1998 Sep;125(17):3497-508. doi: 10.1242/dev.125.17.3497.
A MYB-related transcription factor (MIXTA) that controls development of conical cell form is expressed only in the inner epidermis of Antirrhinum petals. Expression of this gene throughout transgenic tobacco plants leads to excess numbers of multicellular trichomes on leaves and floral organs as well as the novel production of conical cells on leaves. These data indicate that conical cells and trichomes are produced by a common developmental pathway. The timing of MIXTA expression suggests that the choice between the cell types depends on the competence for cell division at the time at which the controlling gene is expressed. Duplication of genes and their association with different cis-regulatory regions may therefore result in the specification of novel plant cell types.
一种控制锥形细胞形态发育的MYB相关转录因子（MIXTA）仅在金鱼草花瓣的内表皮中表达。该基因在整个转基因烟草植株中的表达导致叶片和花器官上出现过多的多细胞毛状体，以及叶片上产生新型的锥形细胞。这些数据表明，锥形细胞和毛状体是由共同的发育途径产生的。MIXTA表达的时间表明，细胞类型之间的选择取决于控制基因表达时细胞分裂的能力。因此，基因复制及其与不同顺式调控区域的关联可能导致新型植物细胞类型的特化。
