Ancestral reproductive structure in basal kelp Aureophycus aleuticus.

Ancestral reproductive structure in basal kelp Aureophycus aleuticus.
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DOI:
10.1038/srep02491
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Holser, Karin
Holser, Karin
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kawai, Hiroshi;Hanyuda, Takeaki;Ridgway, L. Michelle;Holser, Karin

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海带是水生环境中最大的光合生物,是沿海生态系统的重要生态组成部分。最大的海带,如巨囊藻(Macrocystis),表现出柄和叶片的区别,以及浮力,以保持远端部分在水面上进行光合作用,而生殖结构仅在特殊叶片(孢子叶)的基部附近。基本海带如索达和衍生海带之间存在相当大的差距,海带专业化的进化尚不清楚。在这里,我们报告了最近发现的物种Aureophycus aleuticus的新的生殖适应性;与任何已知的海带不同,阿留蒂藻只在扩大的圆盘状支架上形成海带。分子系统发育表明,阿留须鱼是衍生海带中最基础的。由于Aureophycus缺乏在其他衍生海带中发现的任何复杂的解剖结构,我们认为它表现出一些最古老的海带形态特征。
Laminarialean species (so-called kelps) are the largest photosynthetic organisms in aquatic environments, constituting significant ecological components of coastal ecosystems. The largest kelps such as Macrocystis exhibit differentiation between stipe and blade, as well as buoyancy to maintain the distal portion at the water's surface for photosynthesis, while bearing reproductive structures only near the base on special blades (sporophylls). There is a considerable gap between basic kelps such as Chorda and derived kelps, and the evolution of kelp specialization remains unclear. Here we report novel reproductive adaptations in the recently discovered species Aureophycus aleuticus; unlike any known kelps, A. aleuticus forms zoidangia only on the expanded, disc-shaped holdfast. Molecular phylogeny suggests that A. aleuticus is most basal among derived kelps. Because Aureophycus lacks any of the elaborate anatomical structures found in other derived kelps, we suggest that it exhibits some of the most ancestral morphological features of kelps.
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