GREEN LIGHT-MEDIATED PHOTOMORPHOGENESIS IN A DINOFLAGELLATE RESTING CYST
GREEN LIGHT-MEDIATED PHOTOMORPHOGENESIS IN A DINOFLAGELLATE RESTING CYST
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DOI：
10.1038/322659a0
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发表时间：
1986-08-14
期刊：
影响因子：
64.8
通讯作者：
ANDERSON, DM
中科院分区：
文献类型：
--
作者：
BINDER, BJ;ANDERSON, DM
高等植物对光的发育反应是众所周知的，而且普遍存在，但在藻类中这种反应的例子并不常见。该小组报告的这些反应一般是光周期的或需要长时间的光照；大多数涉及大型植物2。我们现在报告了一种单细胞藻类--锥状斯氏藻(Scrippsiella trochoei(Stein)Loeblich)的非光合作用、低阈值、光形态发生反应。与所报道的大多数其他甲藻物种的行为不同，休眠的包囊是OFS。车轴草需要光线才能萌发。这一要求在很大程度上通过在短至1秒的曝光中提供的低光子通量来满足。绿灯在引发反应方面是最有效的。鉴于甲藻在许多水生生态系统中作为初级生产者的重要性，以及休眠包囊在控制自然甲藻种群动态方面的潜在作用，本观察结果具有明显的生态学意义。甲藻3的原始系统发育地位，以及真核生物4、5中绿光介导的光形态发生反应的相对稀有性，表明这种现象也可能具有相当大的进化和光生理兴趣。
Developmental responses to light are well known and ubiquitous among higher plants1, but examples of such responses among the algae are less common. Those responses which have been reported in this group are generally photoperiodic or require prolonged light exposures; most involve macrophytes2. We now report a non-photosynthetic, low-threshold, photomorphogenic response in a unicellular alga, the dinoflagellateScrippsiella trochoidea(Stein) Loeblich. In contrast to the reported behaviour of most other dinoflagellate species, resting cysts ofS. trochoidearequire light to germinate. This requirement is satisfied to a large extent by low photon fluences delivered in exposures as short as 1 second. Green light is most effective in eliciting the response. Given the importance of dinoflagellates as primary producers in many aquatic ecosystems and the potential role of resting cysts in controlling the dynamics of natural dinoflagellate populations, the present observations are of obvious ecological significance. The primitive phylogenetic standing of dinoflagellates3, and the relative rarity of green light-mediated photomorphogenic responses in eukaryotes generally4,5,suggest that this phenomenon may also hold considerable evolutionary and photophysiological interest.