J Syst Evol ›› 1990, Vol. 28 ›› Issue (3): 177-184.

• Research Articles •     Next Articles

Studies on the Karyotype of 5 Samples of Allium Sect. Bromatorrhiza Ekberg

Yan Yi-Xiang, Huang Rui-Fu, Wei Rong-Cheng, Xu Jie-Mei   

  • Published:1990-05-10

Abstract: The karyotypes of 5 samples in Allium Sect. Bromatorrhiza Ekberg were analysed in this paper. In Allium wallichii Kunth, the first sample is a diploid, with genome formula is AA and karyotype formula is K(2n)=2x=14=2m(SAT)+2m+10sm. The second is an autotetraploid, with genome formula AAAA, karyotype formul K(2n)=4x=28=2m(SAT)+6m+20sm. These two karyotypes belong to “3A”. The two karyotypes of A. wallichii Kunth are similar in morphology, though different in ploidy. In Allium hookeri Thwaites, the first sample is a dibasic autoallotriploid. Its genome formula is AAB1; the basic number of the genome A is 7 and that of the genome B1 is 8. The karyotype formula is K(2n)=2x+x'=22=(12sm+2t)+(1m+4sm+1st+2t). The second is also an autoallotriploid. The genomes in pairs are similar to those in the first sample in size and morphology of chromosomes. However, the unpaired genome differs from the first one apparently. Therefore, its genome formula is AAB2, and karyotype formula is K(2n)=2x+ x'=22=(12sm+2t)+(3m+1sm+2st+2t). The third is doubling of the first karyotype. It is an autoallohexaploid, with genome formula AAAAB1 B1 and karyotype formula K(2n)=4x+2x'= 44= (24sm+4t) + (2m+8sm+2st+4t). These three karyotypes belong to “3A”.

Key words: Allium wallichii Kunth, Allium hookeri Thwaites, autotetraploid, autoallotriploid, autoallohexaploid