Ontogeny of the capacity for homeoviscous adaptation in white sturgeon (Acipenser transmontanus)
Ontogeny of the capacity for homeoviscous adaptation in white sturgeon (Acipenser transmontanus)
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白鲟（Acipenser transmontanus）同卵适应能力的个体发育
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
J. P. Eenennaam
中科院分区：
文献类型：
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作者：
R. Buddington;J. Hazel;S. Doroshov;J. P. Eenennaam
大多数鱼类在其早期生活史中耐受的温度范围较窄。为了确定这是否可能与调节膜流动性的能力的发展有关（稳态粘性适应），我们检查了发育中的白色鲟鱼卵、胚胎和在自然产卵温度范围内（14°）、高于（20°）和低于（8°）的温度下孵育的摄食前幼虫的组织磷脂的脂肪酸组成。死亡率是最高的在低温下，与神经胚形成前的最大损失。相对于14°，高温也导致死亡率增加，死亡率在神经胚形成和孵化之间达到峰值。在14° C恒温条件下，发育过程中观察到组织磷脂的脂肪酸组成发生了显著变化，但在低温和高温条件下发育改变了变化模式。相反的homeovascularity理论，在低温下孵育的胚胎表现出下降的比例不饱和饱和脂肪酸（U/S比）。相比之下，暴露于低温和高温的孵化后幼虫分别比保持在14°的幼虫表现出更高和更低的U/S比，这意味着在孵化时就获得了等粘适应能力。虽然缺乏一个homeoviscussive反应的胚胎可能占在极端温度下存活率低，磷脂脂肪酸组成的变化对细胞膜的生物物理特性的具体影响仍有待确定。© 1993 Wiley-Liss公司。
Most fish species tolerate a narrower range of temperatures during their early life history. To ascertain whether this might be related to development of the capacity to regulate membrane fluidity (homeoviscous adaptation), we examined the fatty acid composition of tissue phospholipids from developing white sturgeon eggs, embryos, and prefeeding larvae incubated at temperatures both within the range of natural spawning temperatures (14°), and above (20°) and below (8°). Mortality was highest at low temperature, with the greatest losses prior to neurulation. High temperature also resulted in increased mortality relative to 14°, with peak mortality between neurulation and hatch. At a constant temperature of 14°, significant changes in the fatty acid composition of tissue phospholipids were observed during development, but the patterns of change were altered by development at low and high temperature. Contrary to homeoviscous theory, embryos incubated at low temperature exhibited a decline in the ratio of unsaturated to saturated fatty acids (U/S ratio). In contrast, posthatch larvae exposed to low and high temperature exhibited, respectively, higher and lower U/S ratios than larvae maintained at 14°, implying that the capacity for homeoviscous adaptation is acquired at the time of hatch. Although the lack of a homeoviscous response by embryos may account for low survival at temperature extremes, the specific influences of the observed changes in phospholipid fatty acid composition on the biophysical properties of cell membranes remain to be determined. © 1993 Wiley-Liss, Inc.
通过集合管细胞结合和内化荧光加压素类似物。
DOI：
10.1152/ajpcell.1988.255.5.c622
发表时间：
1988
期刊：
The American journal of physiology
影响因子：
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作者：
Kirk,KL
通讯作者：
Kirk,KL