title: A synthetic wheat with 56 chromosomes derived from Triticum turgidum and Aegilops tauschii.
abstract: By colchicine treatment of hybrids between Triticum turgidum and Aegilops tauschii (as seedlings), a fertile wheat plant (SHW-L2) carrying 56 chromosomes was artificially synthesized. At metaphase I of 50 pollen mother cells, the 56 chromosomes of the new wheat SHW-L2 showed a mean pairing configuration of 2.82 univalents, 6.18 rod bivalents, 19.39 ring bivalents, 0.5 trivalents, and 0.14 quadrivalents. Cytological analyses suggested that SHW-L2 had additional 7 pairs of chromosomes from the A and D genome besides the 42 chromosomes of common wheat. The special chromosome constitution of SHW-L2 may be derived from the chromosome doubling by the colchicine treatment of seedlings and then spontaneous doubling of gametes.
authors.affiliation: Triticeae Research Institute, Sichuan Agricultural University, Dujiangyan city, Sichuan, China.
authors.forename: Lianquan
authors.initials: L
authors.lastname: Zhang
authors.forename: Dengcai
authors.initials: D
authors.lastname: Liu
authors.forename: Xiujin
authors.initials: X
authors.lastname: Lan
authors.forename: Youliang
authors.initials: Y
authors.lastname: Zheng
authors.forename: Zehong
authors.initials: Z
authors.lastname: Yan
mesh_terms: D032461:Chromosomes, Plant / Q000187:drug effects / Q000235:genetics*; D003078:Colchicine / Q000494:pharmacology; D003433:Crosses, Genetic; D014644:Genetic Variation / Q000187:drug effects; D006823:Hybrid Vigor / Q000235:genetics; D006824:Hybridization, Genetic; D014908:Triticum / Q000187:drug effects / Q000235:genetics*
chemical_list: D003078:Colchicine