Alternative morphs and plasticity of vulval development in a rhabditid nematode species
Alternative morphs and plasticity of vulval development in a rhabditid nematode species
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DOI：
10.1007/s00427-003-0376-y
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发表时间：
2004-02-01
影响因子：
2.4
通讯作者：
Félix, MA
中科院分区：
文献类型：
--
作者：
Félix, MA
在标准培养条件下的线虫物种小杆线虫SB 347（小杆线虫科）显示出具有不同有性生殖模式的两种发育变体：（1）通过四个摄食的幼年（“幼虫”）阶段发育的雌性和雄性;（2）通过强制性非摄食的第三幼年阶段（“幼仔”）发育的自能生殖的前雄两性体。在雌性和雄性中，体细胞性腺发育开始于第一幼虫阶段，而在雌雄同体中，体细胞性腺发育延迟到第二幼虫阶段。女性和雌雄同体之间的外阴发育也不同：（1）P8.p细胞在女性中分裂，但在雌雄同体中保持不分裂;（2）从性腺到外阴前体细胞的诱导信号的数量，时间和来源在两种变体之间不同。这些结果表明，相同基因型的动物可以采用离散的外阴发育路线。
The nematode species Rhabditis sp. SB347 (Family Rhabditidae) in standard culture conditions displays two developmental morphs with distinct modes of sexual reproduction: (1) females and males that develop through four feeding juvenile ("larval") stages; (2) self-fertile protandric hermaphrodites that develop through an obligatory non-feeding third juvenile stage, the "dauer" larva. In females and males, somatic gonad development begins in the first larval stage, whereas in hermaphrodites it is delayed to the second larval stage. Vulval development also differs between females and hermaphrodites: (1) the P8.p cell divides in females but stays undivided in hermaphrodites; (2) the number, timing, and source of inductive signals from the gonad to the vulval precursor cells differ between the two morphs. These results show that discrete vulva developmental routes can be adopted by animals of the same genotype.