Przemeck G K, Mattsson J, Hardtke C S, Sung Z R, Berleth T
Institut für Genetik und Mikrobiologie, Lehrstuhl für Genetik, Universität München, Germany.
Planta. 1996;200(2):229-37. doi: 10.1007/BF00208313.
In the embryo of Arabidopsis thaliana (L.) Heynh., formation of the hypocotyl/root axis is initiated at the early-globular stage, recognizable as oriented expansion of formerly isodiametric cells. The process depends on the activity of the gene MONOPTEROS (MP); mp mutant embryos fail to produce hypocotyl and radicle. We have analyzed the morphology and anatomy of mp mutant plants throughout the Arabidopsis life cycle. Mutants form largely normal rosettes and root systems, but inflorescences either fail to form lateral flowers or these flowers are greatly reduced. Furthermore, the auxin transport capacity of inflorescence axes is impaired and the vascular strands in all analyzed organs are distorted. These features of the mutant phenotype suggest that the MP gene promotes cell axialization and cell file formation at multiple stages of plant development.
在拟南芥（Arabidopsis thaliana (L.) Heynh.）胚胎中，下胚轴/根轴的形成始于早期球状胚阶段，可通过先前等径细胞的定向扩展来识别。该过程依赖于基因MONOPTEROS（MP）的活性；mp突变体胚胎无法产生下胚轴和胚根。我们分析了mp突变体植株在整个拟南芥生命周期中的形态学和解剖学特征。突变体形成的莲座叶丛和根系基本正常，但花序要么无法形成侧花，要么这些花大大减少。此外，花序轴的生长素运输能力受损，所有分析器官中的维管束都发生了扭曲。突变体表型的这些特征表明，MP基因在植物发育的多个阶段促进细胞轴向化和细胞列形成。
