| 日本沼虾染色体及其核型的研究 |
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| 引用本文： | 邱高峰,堵南山,赖伟.日本沼虾染色体及其核型的研究[J].海洋与湖沼,1994,25(5):493-498. |
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| 作者姓名： | 邱高峰 堵南山 赖伟 |
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| 作者单位： | 华东师范大学生物学系!上海，200062，华东师范大学生物学系!上海，200062，华东师范大学生物学系!上海，200062 |
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| 基金项目： | 国家教委高校博士点科研基金!9326906 |
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| 摘 要： | 于１９９２年３月在上海青县采集日本沼虾，以改进的空气干燥法研究精巢细胞染色体及核型，特别较详细地研究了减数分裂前期Ｉ染色体的行为。结果表明，日本沼虾染色体数ｎ＝５３，２ｎ＝１０４，共分为Ａ，Ｂ，Ｃ，Ｄ４个染色体组；核型组成是Ｎ＝３７Ｍ＋４ＳＴ＋１１Ｔ；初级精母细胞减数分裂前期Ｉ可分为细线期／偶线期，粗线期、双线期和终变期５个时期，双线期的二价体存在弥散阶段，减数分裂的同步率高，大多处于双线期，且双
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| 关 键 词： | 日本沼虾 染色体 核型 减数分裂 |
| 收稿时间： | 1993/7/23 0:00:00 |
| 修稿时间： | 1994/5/16 0:00:00 |
CHROMOSOMAL AND KARYOLOGICAL STUDIES ON THE FRESHWATER PRAWN MACROBRACHIUM NIPPONENSE (CRUSTACEA, DECAPODA) |
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| Qiu Gaofeng,Du Nanshan and Lai Wei.CHROMOSOMAL AND KARYOLOGICAL STUDIES ON THE FRESHWATER PRAWN MACROBRACHIUM NIPPONENSE (CRUSTACEA, DECAPODA)[J].Oceanologia Et Limnologia Sinica,1994,25(5):493-498. |
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| Authors: | Qiu Gaofeng Du Nanshan and Lai Wei |
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| Institution: | Department of Biology. East China Normal University, Shanghai 200062;Department of Biology. East China Normal University, Shanghai 200062;Department of Biology. East China Normal University, Shanghai 200062 |
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| Abstract: | The chromosomes and karyotype of the freshwater prawn Macrobrachium nipponense were studied by the modified air-dry metkod applied to the testis, focussing on the chromosome behaviour at the first meiotic prophase. The specimens used in this experiment were collected from Qingpu County, Shanghai, in March 1993, and reared in aerated well water in the laboratory. 131 dividing cells were observed in 28 prawns. The results indicated that diploid and the haploid chromosome number of the prawn were 104 and 52, respectively. Most of the dividing cells were found to be of meiosis I and few mitotic divisions were observed. The haploid set of chromosomes, which had a chromosome formula of N = 37M + 4ST + 11T, was divided into 4 genomes (A,B,C,D) according to the relative size, arm ratio and shape of the bivalents at meiotic diplotene.The first meiosis prophase consisted of letotene/zygotema, pachytene, diplotene and diakinesis. The diplotene contained a diffuse stage, and was. most frequently observed in a large number of spermatocytes due to the high sychrony in thcir meioticdivision. Centromeres could be identified easily on tbe bivalents at diplotene, so it was convenient ta analyse the karyotype. |
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| Keywords: | Macrobrachium nipponense Chromosome Karyotype Meio tic division Diplotene Bivalent |
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