Govorunova E G, Sineshchekov O A
Faculty of Biology, Lomonosov Moscow State University, Moscow, 119992, Russia.
Biochemistry (Mosc). 2005 Jul;70(7):717-25. doi: 10.1007/s10541-005-0176-2.
Behavior of the green flagellate alga Chlamydomonas changes in response to a number of chemical stimuli. Specific sensitivity of the cells to different substances might appear only at certain stages of the life cycle. The heterogamous species C. allensworthii demonstrates chemotaxis of male gametes towards pheromones excreted by female gametes. In C. reinhardtii chemotaxis towards tryptone occurs only in gametes, whereas chemotaxis towards ammonium, on the contrary, only in vegetative cells. Chemotaxis to different chemical stimuli might involve different mechanisms of reception and signal transduction, elucidation of which has only recently begun. Indirect evidences show that the cells likely respond to tryptone with changes in the membrane electrical conductance. The recently completed project of sequencing the whole nuclear genome of C. reinhardtii provides the basis for future identification of molecular elements of the chemosensory cascade in this alga.
绿藻衣藻（Chlamydomonas）的行为会因多种化学刺激而发生变化。细胞对不同物质的特定敏感性可能仅在生命周期的某些阶段出现。异配生殖的艾伦斯沃思衣藻（C. allensworthii）表现出雄配子对雌配子分泌的信息素的趋化作用。在莱茵衣藻（C. reinhardtii）中，对胰蛋白胨的趋化作用仅发生在配子中，而对铵的趋化作用则相反，仅发生在营养细胞中。对不同化学刺激的趋化作用可能涉及不同的受体和信号转导机制，而对这些机制的阐明直到最近才开始。间接证据表明，细胞可能通过膜电导的变化对胰蛋白胨作出反应。最近完成的莱茵衣藻全核基因组测序项目为未来鉴定该藻类化学感应级联反应的分子元件提供了基础。
