II.43. Allelism testing of chlorina mutants in Trebi barley.
Michael McMullen and T. E. Haus, Colorado State University, Agronomy Department, Fort Collins, Colorado 80521, U.S.A.
The spontaneous chlorina mutants in Trebi barley collected by D. W. Robertson at Colorado State University are being tested for allelism among themselves and with the collection of designated chlorina mutant stocks: f, fc, f3, f4, f5, f6, f7, f8, and f9.
Normal green progeny from a cross indicate nonallelism of the chlorina genes contained by the parents. Chlorina progeny indicate either allelism of the chlorina genes contained by the parents or maternal inheritance of the chlorina character. Trebi XIII is an example of suspected maternal inheritance. When used as the female parent, Trebi XIII produced all chlorina progeny in all crosses tested. Conversely, when used as the male parent, Trebi XIII yielded all normal green progeny except when crossed with Trebi X so that it appears that the chlorina character is transmitted through the female plant, but not through the pollen. The data also indicate the possibility of maternal inheritance in the Trebi X line.
Three other maternal chlorina stocks have been observed, Coast V by D. W. Robertson and Trebi VIII and Trebi 67-8043A by T. Tsuchiya (see this issue). If further tests prove Trebi XIII and X to show maternal inheritance, they will be the third and fourth cases of that type of inheritance in chlorina lines in the variety Trebi.
The preliminary results also indicate the possibility that Trebi V is allelic with f6 and Trebi XI.
Additional crosses are being made to confirm the preliminary results. The Trebi lines are being crossed reciprocally with normal green plants as a test for maternal inheritance.
