Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (9): 2079-2089.DOI: 10.3969/j.issn.1004-1524.20221534

• Animal Science • Previous Articles     Next Articles

Comparative analysis of chromosome karyotype between male and female red claw crayfish (Cherax quadricarinatus)

LIU Fangfang1(), CHEN Honglin2,*(), LIU Feng2, XU Xiaojun2, HUANG Fuyong2, LOU Bao2, QIAN Haojie3   

  1. 1. School of Fishery, Zhejiang Ocean University, Zhoushan 316022, Zhejiang, China
    2. Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
    3. Haining Honghai Breeding Co., Ltd., Haining 314400, Zhejiang, China
  • Received:2022-10-31 Online:2023-09-25 Published:2023-10-09

Abstract:

In order to obtain accurate chromosome number, arm length and other data to assist chromosome level genome assembly of red claw crayfish (Cherax quadricarinatus), as well as to understand its cytogenetic characteristics, the karyotype differences between male and female red claw crayfish chromosomes were analyzed. The hepatopancreas and testis of red claw crayfish were used as materials to screen the best duration of colchicine. The chromosome specimens were prepared by low permeability and air drying methods. The mitotic phases were obtained from male and female hepatopancreas, and the meiosis phases were obtained from testis. The number of chromosomes of 36 female and male mitotic phases and the number of bivalents of 36 male meiotic phases were counted. The results showed that the highest frequency of the number of chromosomes was 200, which accounted for 39.3% and 50.0% in female and male red claw crayfish, respectively. And the highest frequency of the number of bivalents was 100, which accounted for 50%. The mitotic metaphase with clear chromosome morphology and identifiable centromere was selected for karyotype analysis. It was found that the results of karyotype grouping of female and male red claw crayfish chromosomes were consistent, and the karyotype formula was n=100=36(m)+33(sm)+14(st)+17(t). No heterotypic chromosome was found. The results of independent sample t-test showed that there was no significant difference in chromosome length and chromosome arm ratio of each type between male and female red claw cravfish (P>0.05). The present study compared the chromosome karyotype of female and male red claw crayfish for the first time, which enriched the basic research of red claw crayfish cytogenetics and the chromosome karyotype information of decapods, provided basic data for the genetic breeding of red claw crayfish and reliable reference data for its genome assembly at the chromosome level.

Key words: red claw crayfish (Cherax quadricarinatus), hepatopancreas, testis, chromosome, karyotype analysis

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