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| 文蛤产后能量代谢变化分析 |
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张双丽,王鸿霞,刘保忠
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中国科学院海洋研究所
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| 摘要: |
| 动物生殖是一项需要消耗大量能量的生命活动。为探究雌、雄文蛤配子排放后是否存在能量代谢差异，我们对产卵排精后的雌、雄文蛤在连续时间内进行了生理指标测定，并对足组织中糖原和葡萄糖含量及糖代谢途径中关键的限速酶活性进行了检测。结果显示，排卵后雌蛤的耗氧率（"R" _"OR" ）、排氨率（"R" _"NR" ）、摄食率（"R" _"IR" ）与排粪率（"R" _"FER" ）均高于排精后的雄蛤，表明雌蛤的生殖生理活动强度高于雄蛤，因而繁殖代价更大，产后需要摄入更多的能量用以恢复其生理状态；雌、雄文蛤的氧氮比在产后一直高于24，提示代谢底物仍以碳水化合物和脂肪为主。文蛤的葡萄糖含量在产后迅速上升然后逐渐恢复，配子排放前后雌、雄文蛤的己糖激酶（HK）活性变化不大，雄蛤的磷酸果糖激酶（PFK）活性在生产前后保持稳定，雌蛤PFK活性在排卵后显著下降，表明雌蛤的糖代谢活动受到了一定程度的抑制。研究结果有助于理解生殖活动对不同性别文蛤能量代谢影响的差异，为文蛤健康养殖提供科学参考。 |
| 关键词: 文蛤 生殖 性别差异 生理指标 糖代谢 |
| DOI： |
| 分类号:Q344 |
| 基金项目:现代农业产业技术体系 (CARS-49) 和山东省泰山产业领军专项资助。 |
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| Analysis of energy metabolism changes in the clam Meretrix petechialis after spawning |
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Zhang Shuangli1, Wang Hongxia2, Liu Baozhong2
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1.Institute of Oceanology,Chinese Academy of Sciences;2.Institute of Oceanology, Chinese Academy of Sciences
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| Abstract: |
| The reproductive process in animals is a life activity that necessitates significant amounts of energy. To investigate potential differences in energy metabolism between male and female clams Meretrix petechialis after spawning, we monitored physiological indicators of post-reproductive female and male clams at regular intervals and analyzed the levels of glycogen and glucose in foot tissues, as well as the activity of key rate-limiting enzymes involved in sugar metabolism. Our findings revealed that the oxygen consumption rate ("R" _"OR" ), ammonia excretion rate ("R" _"NR" ), feeding rate ("R" _"IR" ) and fecal excretion rate ("R" _"FER" ) after spawning were higher in female clams compared to males, indicating a higher reproductive cost and increased energy intake to restore her physiological state. Both female and male clams consistently exhibited oxygen/nitrogen ratios higher than 24 after spawning, signifying carbohydrates and fats as the primary metabolic substrates. Glucose levels in the clams increased rapidly after spawning, and then gradually returned to normal, indicating dynamic changes and recovery processes of sugar substances after spawning. The activity of hexokinase (HK) in male and female clams remained relatively stable before and after spawning; however, the activity of phosphofructokinase (PFK) in female clams declined significantly after spawning, suggesting a suppression of carbohydrate metabolism specifically in female clams. These finding provide insights into the differential impact of reproduction on energy metabolism between genders and have implications for the sustainable clam aquaculture. |
| Key words: Meretrix petechialis reproduction gender differences physiological index carbohydrate metabolism |
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