Eleutheronema rhadinum is a potential commercial fisheries species and is subject to intense exploitation in China. Knowledge on the population structure of E. rhadinum in Chinese coastal waters, which is important fo...Eleutheronema rhadinum is a potential commercial fisheries species and is subject to intense exploitation in China. Knowledge on the population structure of E. rhadinum in Chinese coastal waters, which is important for sustainable exploitation and proper resource management, is lacking. In the present study, the genetic diversity and population structure of E. rhadinum were evaluated using a 564-base pair fragment of the mitochondrial cytochrome c oxidase subunit I （COl） gene. A total of 76 specimens were collected from three localities around the East （Qidong and Zhoushan） and South China Seas （Zhuhai）. Among these individuals, nine polymorphic sites were detected and 1 l distinct haplotypes were defined. High levels ofhaplotype diversity （h=0.759i0.035） and low levels of nucleotide diversity （re=0.001 98i0.003 26） were observed in these populations, Hierarchical analysis of molecular variance （AMOVA） indicated that 96.72% of the genetic variation occurred within the populations, whereas 3.28% occurred among populations. No significant genealogical branches or clusters were recognized on the neighbor-joining tree. Intra-group variation among populations was significant （~0~t=0.032 85, P〈0.01）. These results suggest that E. rhadinum populations in the East and South China Seas have developed divergent genetic structures. Tests of neutral evolution and mismatch distribution suggest that E. rhadinum may have experienced a population expansion. The present study provides basic information for the conservation and sustainable exploitation of this species.展开更多
【目的】基于转录组测序分析溶解氧对四指马鲅(Eleutheronema tetradactylum)幼鱼鳃组织的影响,探究四指马鲅应对低氧胁迫的适应机制,为四指马鲅的抗逆性研究提供参考依据。【方法】以四指马鲅幼鱼为试验材料,设3种溶解氧含量处理,常氧...【目的】基于转录组测序分析溶解氧对四指马鲅(Eleutheronema tetradactylum)幼鱼鳃组织的影响,探究四指马鲅应对低氧胁迫的适应机制,为四指马鲅的抗逆性研究提供参考依据。【方法】以四指马鲅幼鱼为试验材料,设3种溶解氧含量处理,常氧组(CG)6.33±0.15mg/L、中度低氧组(OC4)3.99±0.18mg/L和重度低氧组(OC2)2.05±0.15mg/L,处理29 h,采集鳃组织进行转录组测序,利用DEGseq筛选不同比较组的差异表达基因(DEGs),使用GOseq进行GO功能注释分析,利用KOBAS进行KEGG信号通路富集分析,采用STEM对DEGs进行表达趋势分析。【结果】OC4 vs CG比较组有86个DEGs,其中28个上调表达,58个下调表达;OC2 vs CG比较组有2018个DEGs,其中740个上调表达,1278个下调表达;OC4vsOC2比较组有171个DEGs,其中68个上调表达,103个下调表达。GO功能注释分析结果显示,DEGs主要涉及代谢过程、有机物生物合成、细胞氧化还原平衡、细胞内、染色质、核糖体结构成分和催化活性等功能条目。KEGG信号通路富集分析结果显示,DEGs主要富集在蛋白酶体、DNA复制、脂肪酸降解、磷酸戊糖途径、氧化磷酸化、谷胱甘肽代谢、赖氨酸降解和核糖体生物发生等信号通路;其中pac1、lsm7、mcm6、mcm2和mdm2等基因富集在蛋白酶体、剪接体、DNA复制和细胞周期等信号通路,与四指马鲅幼鱼鳃组织蛋白合成有关,随着溶解氧含量下降,其表达量呈下降趋势;shmt2、hsd17b10、sucla2和glo1等基因富集在磷酸戊糖途径信号通路,与四指马鲅幼鱼鳃组织能量代谢有关。【结论】四指马鲅幼鱼鳃组织蛋白质合成能力和能量代谢活动均随着溶解氧含量下降而下降,溶解氧含量下降显著影响细胞周期、DNA复制、脂肪酸降解和糖代谢等信号通路。展开更多
基金Supported by the National Key Technology Research and Development Program of China(No.2011BAD13B08)the Central Nonprofit Basic Scientific Research Project for the Scientific Research Institutes of China(No.2011Z01)
文摘Eleutheronema rhadinum is a potential commercial fisheries species and is subject to intense exploitation in China. Knowledge on the population structure of E. rhadinum in Chinese coastal waters, which is important for sustainable exploitation and proper resource management, is lacking. In the present study, the genetic diversity and population structure of E. rhadinum were evaluated using a 564-base pair fragment of the mitochondrial cytochrome c oxidase subunit I （COl） gene. A total of 76 specimens were collected from three localities around the East （Qidong and Zhoushan） and South China Seas （Zhuhai）. Among these individuals, nine polymorphic sites were detected and 1 l distinct haplotypes were defined. High levels ofhaplotype diversity （h=0.759i0.035） and low levels of nucleotide diversity （re=0.001 98i0.003 26） were observed in these populations, Hierarchical analysis of molecular variance （AMOVA） indicated that 96.72% of the genetic variation occurred within the populations, whereas 3.28% occurred among populations. No significant genealogical branches or clusters were recognized on the neighbor-joining tree. Intra-group variation among populations was significant （~0~t=0.032 85, P〈0.01）. These results suggest that E. rhadinum populations in the East and South China Seas have developed divergent genetic structures. Tests of neutral evolution and mismatch distribution suggest that E. rhadinum may have experienced a population expansion. The present study provides basic information for the conservation and sustainable exploitation of this species.
文摘【目的】基于转录组测序分析溶解氧对四指马鲅(Eleutheronema tetradactylum)幼鱼鳃组织的影响,探究四指马鲅应对低氧胁迫的适应机制,为四指马鲅的抗逆性研究提供参考依据。【方法】以四指马鲅幼鱼为试验材料,设3种溶解氧含量处理,常氧组(CG)6.33±0.15mg/L、中度低氧组(OC4)3.99±0.18mg/L和重度低氧组(OC2)2.05±0.15mg/L,处理29 h,采集鳃组织进行转录组测序,利用DEGseq筛选不同比较组的差异表达基因(DEGs),使用GOseq进行GO功能注释分析,利用KOBAS进行KEGG信号通路富集分析,采用STEM对DEGs进行表达趋势分析。【结果】OC4 vs CG比较组有86个DEGs,其中28个上调表达,58个下调表达;OC2 vs CG比较组有2018个DEGs,其中740个上调表达,1278个下调表达;OC4vsOC2比较组有171个DEGs,其中68个上调表达,103个下调表达。GO功能注释分析结果显示,DEGs主要涉及代谢过程、有机物生物合成、细胞氧化还原平衡、细胞内、染色质、核糖体结构成分和催化活性等功能条目。KEGG信号通路富集分析结果显示,DEGs主要富集在蛋白酶体、DNA复制、脂肪酸降解、磷酸戊糖途径、氧化磷酸化、谷胱甘肽代谢、赖氨酸降解和核糖体生物发生等信号通路;其中pac1、lsm7、mcm6、mcm2和mdm2等基因富集在蛋白酶体、剪接体、DNA复制和细胞周期等信号通路,与四指马鲅幼鱼鳃组织蛋白合成有关,随着溶解氧含量下降,其表达量呈下降趋势;shmt2、hsd17b10、sucla2和glo1等基因富集在磷酸戊糖途径信号通路,与四指马鲅幼鱼鳃组织能量代谢有关。【结论】四指马鲅幼鱼鳃组织蛋白质合成能力和能量代谢活动均随着溶解氧含量下降而下降,溶解氧含量下降显著影响细胞周期、DNA复制、脂肪酸降解和糖代谢等信号通路。
文摘于2015年6月~9月在广东珠海对人工孵化和培育的2龄四指马鲅(Eleutheronema tetradactylum)亲鱼的初次性成熟和产卵情况以及苗种规模化全人工繁育技术进行了系统的观察和研究。结果显示,实验期间培育亲鱼2 000余尾,成熟率93%以上。成熟亲鱼的体质量雌雄之间差异较大,雌鱼性腺指数(GSI)为1.03%~6.05%,雄鱼GSI为0.26%~1.76%。雌鱼产卵类型为一年产卵1次,分批成熟、分批产卵,初次性成熟的产卵期从2015年6月13日~9月30日。共计产卵75.0×106粒,受精率为72%~95%,胚胎发育在盐度27~28.8、温度29~31℃、p H 8.1~8.3条件下历时13 h 52 min,孵化率为58%~95%。仔鱼在室内培育,投喂小球藻和轮虫,5~7 d后转移到室外土池进行培育,7 d后投喂小球藻、轮虫、枝角类和桡足类幼体。第25天起投喂卤虫无节幼体,第30天起投喂粉状配合饲料并逐渐过渡到投喂人工颗粒饲料。从2015年7月23日开始至9月30日累计培育出子二代苗15.0×106尾,平均成活率为25.0%。综合亲鱼产卵和幼苗育成情况,认为该鱼全人工繁育的技术关键在于如何培育优质的亲鱼以及育苗过程中水质的控制和适口饵料选择及其适时更换。
