On the Allocation to the Homoeologous Group 3 0f the Gametocidal Aegilops tyiuncialis Chromosome in Common Wheat
著者
T.Ryu ENDO
(Endo ryu)
教養部
Y. KATAYAMA
(katayama)
教養部
版
Publisher
出版地
奈良
出版者
奈良大学
上位タイトル
奈良大学紀要
(Memoirs of the Nara University).
Vol.5号,
(1976.
12)
,p.211-
219
識別番号
ISSN
03892204
抄録
Substitution of alien cytoplasms for the cytoplasm of wheat has been intensively investigated by several workers (Maan 1973, Panayotov and Gotsov 1975, Tsunewaki et al. 1976). The cytoplasm substitution was achieved by backcrossing F1 hybrids between alien species as females and wheat as males to the recurrent pollen parents
of wheat.In the process of backcrossing, especially in the earlier backcross generations, many wheat derivatives possessing one or more alien chromosomes were obtained.
Recently, some such alien chromosomes were found to provoke atypical breeding behavior in wheat: When alien chromosomes were added to wheat in
monosomic condition, they caused great reduction of seed fertility, and viable offspring produced by the backcross were always of the parental type.Endo and Tsunewaki (1975) isolated two such chromosomes separately from Aegilops triuncialis and synthetic triuncialis into common wheat. These chromosomes were distinguished from those of common wheat by their subterminal centromeres. Maan (1975) also reported two other Aegilops chromosomes showing similar breeding behavior in common wheat, one derived from Ae. longissima and the other from Ae. sharonensis.These workers independently studied the mechanism of the preferential transmission of those Aegilops chromosomes accompanied by the low seed fertility, and reached the same conclusion: When the critical Aegilops chromosomes present in common wheat in monosomic condition, only the gametes with the alien chromosome are
functional, while gametes lacking it can not function, resulting in the preferential transmission of this chromosome.
