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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Nutritional effects on the visual system of the rotifer Brachionus plicatilis sensu stricto (Rotifera: Monogononta)
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Nutritional effects on the visual system of the rotifer Brachionus plicatilis sensu stricto (Rotifera: Monogononta)

机译：营养对轮虫Brachionus plicatilis sensu stricto（轮虫：Monogononta）视觉系统的营养影响

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摘要

Rotifers have a light sensor called "eyespot" which is expected to be composed of rhodopsin. Based on the molecular feature of rhodopsin as regenerated with 11-cis-retinal, we hypothesized that phototactic behavior should be affected by the nutritional level of food; especially vitamin A availability. This study intended to address the following questions on the nutritional effects of using baker's yeast (Saccharomyces cerevisiae) and Nannochloropsis oculata: how does diet affect the pigmented area and absorbance of the eyespot, and how do these changes characterize phototactic behavior and population growth in the monogonont rotifer Brachionus plicatilis sensu stricto. The pigmented area of the eyespot decreased to 14.7 μm~2 with baker's yeast while it was maintained at the initial size of 82.9 μm~2 with N. oculata. Maximum absorbance of the eyespot was observed at a range of 470 to 525 nm in the initial rotifers and it was not significantly changed with diet type and culture day. The value of the maximum absorbance was maintained with N. oculata, while it rapidly decreased on day 10 with baker's yeast. Stronger positive photo taxis with N. oculata was observed under lower light intensity (0.1 and 0.5 W m~(-2)) at 470 nm. On the other hand, phototaxis with baker's yeast became weak and no phototactic reactions were observed under the same lighting condition. From the genomic DNA database of rotifers, 12 putative opsin-relevant genes were identified. These results corroborate the hypothesis that rhodopsin is the visual pigment in the rotifer eyespot. Lack of vitamin A with baker's yeast should induce reduction of the pigmented area and the sensitivity of the rotifer eyespot resulting in weak phototaxis. The population growth of rotifers showed different patterns related to the food type and light intensity. The lowest population growth (0.33-0.37 day~(-1)) was shown with baker's yeast diet at 0.5 W m~(-2). This phenomenon may be significantly related to malnutrition on baker's yeast which is deficient not only in vitamin A but also in fatty acids, vitamin B_(12) and its derivatives.
机译：轮虫有一个称为“眼点”的光传感器，该传感器有望由视紫红质组成。基于视紫红质在11-顺-视网膜上再生的分子特征，我们假设光营养行为应受食物营养水平的影响。特别是维生素A的可用性。这项研究旨在解决以下有关使用面包酵母（Saccharomyces cerevisiae）和Nannochloropsis oculata的营养影响的问题：饮食如何影响色素沉着区域和眼点吸收，以及这些变化如何表征光合作用行为和种群增长？单性轮虫轮虫Brachionus plicatilis sensu stricto。面包酵母使眼点的色素沉着区减少到14.7μm〜2，而用猪眼线虫将其保持在最初的82.9μm〜2。在最初的轮虫中，在470至525 nm的范围内观察到了眼点的最大吸收率，并且在饮食类型和培养天数方面没有明显变化。 N. oculata维持最大吸收值，而面包酵母在第10天迅速降低。在较低的光强度（0.1和0.5 W m〜（-2））下，在470 nm处观察到了较强的带眼虫正照片滑行。另一方面，用面包酵母的趋光性变弱，在相同的光照条件下未观察到光致反应。从轮虫的基因组DNA数据库中，鉴定出12个假定的视蛋白相关基因。这些结果证实了视紫红质是轮虫眼斑中视觉色素的假设。面包酵母缺乏维生素A会导致色素沉着区域的减少和轮虫眼点的敏感性，导致趋光性减弱。轮虫的种群增长表现出与食物类型和光照强度有关的不同模式。面包酵母饮食在0.5 W m〜（-2）时，种群增长最低（0.33-0.37天〜（-1））。这种现象可能与面包酵母营养不良有关，后者不仅缺乏维生素A，而且缺乏脂肪酸，维生素B_（12）及其衍生物。

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    Hee-Jin Kim; Chihona Sawada; Jae-Sung Rhee; Jae-Seong Lee; Koushirou Suga; Atsushi Hagiwara;

  • 作者单位

    Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Bunkyo 1-14, Nagasaki 852-8521,Japan;

    Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Bunkyo 1-14, Nagasaki 852-8521,Japan;

    Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon 406-772, South Korea;

    Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 440-746, South Korea;

    Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Bunkyo 1-14, Nagasaki 852-8521,Japan;

    Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Bunkyo 1-14, Nagasaki 852-8521,Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Rotifera; Nutrient; Eyespot; Phototaxis; Population growth;

    机译：轮虫养分;眼点;趋光性;人口增长;

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