时间性热应力对万年青的影响:生长性能和生理可塑性。

IF 2.1 3区 生物学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY
Diana R. Barajas-Sandoval , Cristina Escobedo-Fregoso , Eduardo Quiroz-Guzmán , Dariel Tovar-Ramírez , Clara Adèle Py , Alberto Peña-Rodríguez
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引用次数: 0

摘要

本研究评估了低温和高温的时间段以及随后的最佳温度恢复阶段对凡纳滨对虾的生长、存活和生理反应的影响。后幼体分别在 22 °C和 32 °C下暴露于应激期 7 天和 14 天,然后在 28 °C下进入恢复阶段,完成七个实验周,并与保持在 28 °C下的对照组进行比较。每周测定增重、特定生长率、采食量、饲料转化率和存活率。在恢复阶段的第 14 天对肌肉、肝胰腺和血淋巴进行取样,以测定生化成分、抗氧化剂和消化酶活性。对虾在短期高热状态下的生长率较高,而在低温状态下,当温度恢复到28 °C时,对虾在热应激后会出现代偿性生长。高体温使摄食量增加了 12-13%,而低体温使摄食量减少了 21-29%。对虾在热应激后会进行新陈代谢调整,短时间的低温会提高脂肪酶活性,增加肝胰脏中的脂质储存,而短时间的高温也会提高糜蛋白酶活性,导致更高的蛋白质和脂质积累。相反,长时间的高热会导致更多的能量消耗,耗尽脂质和糖原储存,而低体温则会导致恢复阶段能量储备的稀缺。抗氧化酶活性不受短期热应激(7 天)的影响,而长期热应激(14 天)会显著影响 SOD、CAT 和 GPx 活性。本研究为了解凡纳滨对虾从热胁迫中恢复的生理可塑性提供了重要的启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of temporal thermal stress on Penaeus vannamei: Growth performance and physiological plasticity.

Effect of temporal thermal stress on Penaeus vannamei: Growth performance and physiological plasticity.

The present study evaluated the effect of temporal periods of hypothermia and hyperthermia, followed by an optimal temperature recovery phase on the growth, survival, and physiological response of Penaeus vannamei. Post-larvae were exposed to stress periods for 7 and 14 days at 22 °C and 32 °C each, followed by a recovery phase at 28 °C to complete seven experimental weeks, and were compared with a control group maintained at 28 °C. Weight gain, specific growth rate, feed intake, feed conversion ratio, and survival were weekly determined. Muscle, hepatopancreas, and hemolymph were sampled on the 14th day of the recovery phase for biochemical composition, and antioxidant and digestive enzyme activities determination. The shrimp presented a higher growth rate during short-term hyperthermia in contrast to shrimp under hypothermia that presented compensatory growth after thermal stress when the temperature was restored at 28 °C. Hyperthermia increased 12–13% the feed intake while this was diminished 21–29% by the hypothermia periods. Shrimp undergo metabolic adjustments following thermal stress, with short hypothermia increasing the lipase activity and lipid storage in the hepatopancreas, while short hyperthermia also enhances chymotrypsin activity and leads to higher protein and lipid accumulation. Conversely, prolonged hyperthermia induces greater energy consumption, depleting lipid and glycogen stores, while hypothermia causes scarce mobilization of energy reserves during recovery phase. Antioxidant enzyme activities were not affected by short-thermal stress (7d), while prolonged thermal stress (14d) significantly affected SOD, CAT, and GPx activities. The present study provides important insights into the physiological plasticity of P. vannamei during recovery from thermal stress.

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来源期刊
CiteScore
5.00
自引率
4.30%
发文量
155
审稿时长
3 months
期刊介绍: Part A: Molecular & Integrative Physiology of Comparative Biochemistry and Physiology. This journal covers molecular, cellular, integrative, and ecological physiology. Topics include bioenergetics, circulation, development, excretion, ion regulation, endocrinology, neurobiology, nutrition, respiration, and thermal biology. Study on regulatory mechanisms at any level of organization such as signal transduction and cellular interaction and control of behavior are also published.
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