ULTRASTRUCTURE OF LIGHT ORGANS OF LOLIGINID SQUIDS AND THEIR BACTERIAL SYMBIONTS: A NOVEL MODEL SYSTEM FOR THE STUDY OF MARINE SYMBIOSES.

IF 0.2 4区 环境科学与生态学 Q4 ECOLOGY
Vie et Milieu-Life and Environment Pub Date : 2009-01-01
R C Guerrero-Ferreira, M K Nishiguchi
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引用次数: 0

Abstract

The class Cephalopoda (Phylum Mollusca), encompassing squids and octopuses, contains multiple species that are characterized by the presence of specialized organs known to emit light. These complex organs have a variety of morphological characteristics ranging from groups of simple, light-producing cells, to highly specialized organs (light organs) with cells surrounded by reflectors, lenses, light guides, color filters, and muscles. Bacteriogenic light organs have been well characterized in sepiolid squids, but a number of species in the family Loliginidae are also known to contain bacteriogenic light organs. Interest in loliginid light organ structure has recently arisen because of their potential as ecological niches for Vibrio harveyi, a pathogenic marine bacterium. This also implies the importance of loliginid light organs as reservoirs for V. harveyi persistence in the ocean. The present study utilized transmission and scanning electron microscopy to characterize the morphology of loliginid light organs and determined the location of bacterial symbiont cells within the tissue. It was determined that the rod-shaped loliginid symbionts lack flagella, as similarly observed in other light organ-associated bacteria. Also, the interaction of individual cells to light organ tissue is not as defined as reported for other squid-Vibrio systems. In addition, SEM observations show the presence of two pores leading to the bacterial chamber. Data presented here offer support for the hypothesis of environmental transfer of bacterial symbionts in loliginid squids.

鱿鱼光器官及其细菌共生体的超微结构:海洋共生研究的新模式系统。
头足纲(软体动物门),包括鱿鱼和章鱼,包含多个物种,这些物种的特点是具有已知能发光的特化器官。这些复杂的器官具有各种形态特征,从简单的产光细胞群到细胞周围有反射器、透镜、导光板、滤色片和肌肉的高度特化器官(光器官)。细菌光器官在鱿鱼中已经有了很好的特征,但已知萝莉鱿科的一些物种也含有细菌光器官。最近,人们开始关注鳞鳃纲的光器官结构,因为它们有可能成为海洋致病细菌哈维氏弧菌的生态位。这也意味着褐藻灯器作为哈维氏弧菌在海洋中持续存在的贮藏库的重要性。本研究利用透射电子显微镜和扫描电子显微镜来描述叶舌藻光器官的形态特征,并确定细菌共生细胞在组织中的位置。研究发现,棒状的褐藻共生体缺乏鞭毛,这与在其他光器官相关细菌中观察到的情况类似。而且,单个细胞与光器官组织的相互作用不像其他乌贼-弧菌系统报告的那样明确。此外,扫描电子显微镜的观察结果表明,存在两个通向细菌室的孔。本文提供的数据支持了鱿鱼细菌共生体环境转移的假说。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Vie et Milieu-Life and Environment
Vie et Milieu-Life and Environment 环境科学-海洋与淡水生物学
CiteScore
0.80
自引率
0.00%
发文量
2
审稿时长
>36 weeks
期刊介绍: Vie et Milieu / Life & Environment is an international journal of general ecology publishing papers in English on marine ecology, trophic webs, ecophysiology, quantitative ecology, modelisation, evolution, phylogenetics, genetics, symbioses, environment. The journal is focused on marine sciences, but also publishes studies on lagoonal and terrestrial domains.
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