Intrinsic constraints on sympodial growth morphologies of azooxanthellate scleractinian coral Dendrophyllia.
Intrinsic constraints on sympodial growth morphologies of azooxanthellate scleractinian coral Dendrophyllia.
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DOI：
10.1371/journal.pone.0063790
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Ezaki Y
中科院分区：
文献类型：
--
作者：
Sentoku A;Ezaki Y
无性繁殖在几乎所有的殖民地生物体中都会发生。然而，关于控制无性繁殖的内在机制以及由此产生的群体形态，人们知之甚少。硬珊瑚，包括共生珊瑚和非共生珊瑚，都能形成精致的群体。为了更好地了解控制固氮叶珊瑚中物种特有群体类型的生长机制，我们研究了波氏树叶珊瑚和冠叶树叶珊瑚合生群体中萌芽模式的细节。萌发表现出以下规律：(1)偏移珊瑚的两个定向隔膜几乎垂直于母珊瑚的生长方向；(2)偏置一般发生在珊瑚一侧的两个侧向原生隔膜中；因此，个体相对于定向隔膜表现出一定的极性，只有当两个原生隔膜都出现分枝偏移量时；(3)侧珊瑚或多或少沿对角向上生长；以及(4)在整个生长过程中，这种规律性和极性保持不变。根据这些规律，D.Boschmai通过在左右两个部位交替萌发，以之字形生长。相比之下，鸡冠草通过在特定部位发芽而螺旋生长。在珊瑚合生生长型中观察到的对萌发规律和萌发位置移动的严格限制，极大地影响了固氮珊瑚群落的结果形态。对这些内在限制的精确理解有助于从根本上理解模块化生物体中的菌落形成机制。
Asexual increase occurs in virtually all colonial organisms. However, little is known about the intrinsic mechanisms that control asexual reproduction and the resultant morphologies of colonies. Scleractinian corals, both symbiotic (zoaxanthellate) and non-symbiotic (azooxanthellate) corals are known to form elaborate colonies. To better understand the growth mechanisms that control species-specific type of colony in azooxanthellate dendrophyllid scleractinian corals, we have studied details of the budding pattern in the sympodial colonies of Dendrophyllia boschmai and Dendrophyllia cribrosa. Budding exhibits the following regularities: (1) the two directive septa of offset corallites are oriented almost perpendicular to the growth direction of parent corallites; (2) offsets generally occur in either of the lateral primary septa that occur on one side of a corallite; the individuals thus show a definite polarity with respect to the directive septa, and only when branching dichotomously offsets occur in both primary septa; (3) the lateral corallites grow more-or-less diagonally upwards; and (4) the regularities and polarities are maintained throughout growth. Given these regularities, D. boschmai grows in a zigzag fashion by alternately budding on the right and left sites. In contrast, D. cribrosa grows helically by budding at a particular site. The strict constraints on budding regularities and shifts in budding sites observed in the sympodial growth forms of corals greatly affect resulting morphologies in azooxanthellate coral colonies. A precise understanding of these intrinsic constraints leads to a fundamental comprehension of colony-forming mechanisms in modular organisms.
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影响因子：
2.4
作者：
DAUGET, JM
通讯作者：
DAUGET, JM
DOI：
10.1560/bcpa-um3a-mkbp-hgl2
发表时间：
2002-01-01
期刊：
ISRAEL JOURNAL OF ZOOLOGY
影响因子：
--
作者：
Rinkevich, B
通讯作者：
Rinkevich, B
影响因子：
1.5
作者：
Sentoku, Asuka;Ezaki, Yoichi
通讯作者：
Ezaki, Yoichi
影响因子：
1.5
作者：
Sentoku, Asuka;Ezaki, Yoichi
通讯作者：
Ezaki, Yoichi
影响因子：
0.9
作者：
Sentoku, Asuka;Ezaki, Yoichi
通讯作者：
Ezaki, Yoichi