Development of a system of enhanced plant growth by gene transfection of the fastest myosin.

细胞质流是植物细胞中广泛存在的一种主动运输方式。虽然已经揭示细胞器相关的肌球蛋白-XI沿着沿着肌动蛋白电缆滑动产生细胞质流，但在植物中的基本功能仍然未知。我们通过将拟南芥肌球蛋白Xi-2的马达结构域替换为轮藻肌球蛋白的马达结构域来产生高速嵌合肌球蛋白Xi。令人惊讶的是，转基因拟南芥高速嵌合肌球蛋白Xi-2的植物大小高于野生型植物。这种大小的变化与细胞质流动的加速有关。这些结果有力地表明，细胞质流是植物大小的一个关键决定因素。此外，由于细胞质流是植物细胞内运输的常见系统，因此我们的系统可以在植物的人工尺寸控制中应用。

Cytoplasmic streaming is active transport widely occurred in plant cells. Although it has been revealed that cytoplasmic streaming is generated by organelle-associated myosin-XI sliding along actin cables, the fundamental function in plants remains unknown. We generated high-speed chimeric myosin XI by replacing the motor domain of Arabidopsis thaliana myosin XI-2 with that of Chara corallina myosin. Surprisingly, the plant size of the transgenic Arabidopsis high speed chimeric myosin XI-2 was higher than that that of the wild-type plant. This size change correlated with acceleration of cytoplasmic streaming. These results strongly suggest that cytoplasmic streaming is a key determinant of plant size. Furthermore, because cytoplasmic streaming is a common system for intracellular transport in plants, our system could have applications in artificial size control in plants.