23:	Interspecific hybridization in sexual diploid Allium senescens var. minor x apomictic tetraploid A. nutans L. and sexual diploid A. senescens var. minor x apomictic hexaploid A. senescens L.

Authors:	Kim, Byung-Joo(A)Kwon, Il-Chan(A)Kwack, Young-Ho(A)Lim, Moo-Sang(A)
Affiliations:	(A): National Yeongnam Agricultural Experiment Station, South Korea (B): Yeongnam University, South Korea
Presenter:	Kim, Byung-Joo , kimbj@nyaes.go.kr

Fourteen interspecific hybrids in sexual diploid A. senescens var. minor x apomictic tetraploid A. nutans L. crosses, and 8 interspecific hybrids in sexual diploid A. senescens var. minor x apomictic hexaploid A. senescens L. crosses were produced. The number of chromosomes was 2n=24 in interspecific hybrids of diploid x tetraploid, and 2n=32 in diploid x hexaploid crosses. Triploid and tetraploid interspecific hybrids showed intermediate morphological characteristics of parents. Tetraploid interspecific hybrids of A. senescens var. minor x A. senescens L. crosses formed two groups based of leaf color and leaf width. Seeds formed in 11 of 14 triploid interspecific hybrids under natural conditions. In cytological observation of parthenogenesis, 3 of 12 triploid interspecific hybrids and 5 of 8 ones were observed. The percentage of pathenogenesis ranged from 26.0% to 86.0% in 5 tetraploid interspecific hybrids. Non-parthenogenesis to parthenogenesis segregated in a 3:5 ratio in A. senescens var. minor x A. senescens L. crosses. Thus, pathonogenesis appeared to be dominant to sexuality in the investigated Allium species.