[The chromosome number and gonadal structure of F9-F11 allotetraploid crucian-carp].
In this paper, the chromosome number of F9-F11 hybridis of Red crucian (Carassius auratus) x common carp(Cryprinus carpio) was examined by means of kidney cell-PHA culture. The results showed that F9-F11 allotetraploids possessed 200 chromosomes, with the karyotype formula 44 m + 68 sm + 44 st + 44 t, which were the same as the data indicated in F3-F8 allotetraploids. Both female and male of F9-F11 allotetraploids had the normal ovaries and testes that were able to produce the normal dipoid ova and sperm. In nature conditions, without the injection of the extraneous hormone, the females and males of F9-F11 allotetraploids mated each other to produce new generation of tetraploids. With the stable genetic tetraploidy and the fertility in the nature environments, this allotetraploid population presented the key factors to form a new species with 200 chromosomes.
Sun
Yuan-Dong
YD
Key Lab of Protein Chemistry and Developmental Biology, College of Life Science, Hunan Normal University, Changsha 410081, China.
Liu
Shao-Jun
SJ
Zhang
Chun
C
Li
Jian-Zhong
JZ
Huang
Wei-Ren
WR
Zhang
Jian
J
Luo
Kai-Kun
KK
Zhou
Gong-Jian
GJ
Liu
Yun
Y
D000818:Animals; D002347:Carps / Q000235:genetics* / Q000502:physiology; D005260:Female; D006066:Gonads / Q000166:cytology* / Q000502:physiology; D007621:Karyotyping; D008297:Male; D011123:Polyploidy; D012098:Reproduction