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Studies on rickettsia-like organism (RLO) disease of tropical marine pearl oyster-Epidemiological investigation of RLO disease in juvenile populations of maricultured pinctada maxima

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Acta Oceanologica Sinica 2003年第3期22卷 421-435页

作者： Xinzhong Wu , Dengfeng Li, Jinpei Pan, Jingbo Jiang College of Animal Sciences,Zhejiang University,Hangzhou 310029,China. Email: wuxz@zju.edu.cnSouth China Sea Institute of Oceanology, Chinese Academy of Sciences,Guangzhou 510301,ChinaSchool of Life Sciences,SUN YAT-SEN University,Guangzhou 510275,China College of Animal Sciences Zhejiang University Hangzhou 310029 China South China Sea Inst. of Oceanology Chinese Academy of Sciences Guangzhou 510301 China School of Life Sciences SUN YAT-SEN University Guangzhou 510275 China

The death which occurred in juvenile population was a severe problem in the course ofpinctada maxima artificial culture. With the methods of field investigation, histological study and statistic analyses, the epidemiological study was carried out on the disease and death in juvenile populations of pinctada maxima in the Xinying Pearl Oyster Mariculture Farm of Lingao County (for the A, B and C batches of cultured juveniles hanged in the sea) and the Xincun Pearl Oyster Mariculture Farm of Lingshui County (for the D batch of cultured juvenile hanged in the pond), Hainan Province from November 1993 to April *** results show that the deaths which occurred in juvenile populations of pinctada maxima presented an outbreak pattern. The peak of mortality rates, in general, occurred in 4-to 6-month old pearl oyster juveniles, and the mortality rates gradully declined with the extention of pearl oyster age after cul-turing 8 months. The correlation between the mortality rates of juvenile populations and mean body lengths of juvenile populations show that the mortality rate become higher under 4 cm of mean body lengths of juvenile population and become obvious declined over 5 cm of mean body lengths. The peak of mortality rate occurred in 1-3 cm of mean body lengths. The results of histological observation showed that rickettsia-like organism inclusions were common, histological widespread infective agent among every batches (A, B, C and D) of cultured juvenile populations. The mean severity indices (SI) of rickettsia-like organism (RLO) infection were positively correlated with mortality rates of juvenile populations. After or within every peaks of RLO infection were all accompanied with the peaks of mortality rates of host populations and the mortality rates declined with decreased RLO infection. So the evidences of histological observation and epidemiology in this study indicated that rickettsia-like organism (RLO) may be as an important pathogenic organism of disease

关键词： pinctada maxima rickettsia-like organism epidemiology juvenile population

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Studies on rickettsia-like organism (RLO)disease of tropical marine pearl oyster——Epidemiological investigation of RLO disease in larvae populations of maricultured pinctada maxima

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Acta Oceanologica Sinica 2001年第4期20卷 563-574页

作者：吴信忠李登峰潘金培 Marine Biology Research Station at Daya Bay South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

The epidemiological investigations on the disease and death in mature eggs, embryonic de- velopmental periods and larvae populations [including oocytes, fertilized ovum, early embryonic phase larvae (6 h), D-shaped phase larvae (24 h), early umbo phase larvae, umbo phase larvae, post um- bo phase larvae and eyespot phase larvae] in the Luhuitou Pearl Oyster Mariculture Farm of Sanya City, Hainan Province in April 1995 showed that there were two peaks of mortality rates which occurred in early umbo phase or umbo phase and post umbo phase (Figs 3-5 and Table 1) respectively from pre- embryonic developmental periods to larvae phases. It indicated that the onset and death of pinctada maxima larvae populations followed a pattem of outbreak. Between the prevalence, intensity of RLO infection and the mortality rates of larvae populations were of obvious positively correlations. Generally, every peak of RLO infection is always follwed by a peak of mortality rate of larvae hosts, and the mor- tality rates of larvae hosts declined with the decreased RLO infection (see Figs 3-5 ). Under the trans- mission electron microscopy (TEM), no rickettsia-like organisms were discovered in oocytes, fertilized ovum and early embryonic phase larvae (6 h). The RLO inclusions occurred first in the D-shaped phase larvae (24 h) under histological examination. Absences of RLO in transmission electron exami- nation of oocytes of RLO-infected adult females, ferilized ovum and early embryonic phase larvae (6 h) indicated that RLO may not be transmitted transovarially. But RLO for host infection may be trans- mitted by contact transmission since RLO inclusions were first identified regularly in D-shaped phase larvae (24 h), while these D-shaped phase larvae were still unable to take food during hatching 24 hours. In addition, the result of epidemiological investigation showed that no odservable death occurred in D-shaped larvae populations, but early obvious death occurred in larvae populations in

关键词： pinctada maxima rickettsia-like organism epidemiology larvae population

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Identification of genes associated with nacre color in golden-lipped pearl oyster pinctada maxima

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Marine Science Bulletin 2021年第2期23卷 73-88页

作者： ZHAO Zihan GONG Shunlian WANG Ziman LEI Chao LI Junhui ZHENG Zhe YANG Chuangye DENG Yuewen Fisheries College of Guangdong Ocean University Zhanjiang 524088Guangdong ProvinceChina Pearl Breeding and Processing Engineering Technology Research Center of Guangdong Province Zhanjiang 524088Guangdong ProvinceChina Guangdong Provincial Engineering Laboratory for Mariculture Organism Breeding Zhanjiang 524088Guangdong ProvinceChina

Pearl oyster pinctada maxima is mainly used to produce high-valued gold and silver colored nucleated *** developed a line with golden nacre in the mantle edge by sampling breeders from the Sanya population of pearl oyster *** is found that the total carotenoid content(TCC)in the mantle tissues of the strain group(SG)was significantly higher than that of the control group(CG).Differentially expressed genes between the strain and control group(a line with silver nacre in the mantle edge)were screened.A total of 28285 genes were annotated in the ***,295 up-regulated genes and 254 down-regulated genes were annotated which the strain compared with the ***-transport and metabolism genes,such as fatty acid-binding protein,cytochrome P4503A and ATP-binding cassette sub-family A were up-regulated in the *** expression levels of candidate genes in the line were higher than those in the CG,which are basically consistent with the transcriptome *** findings are helpful to understand carotenoid metabolism in golden colored nacre formation of pearl oyster ***.

关键词： pinctada maxima carotenoids differential expression genes

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