Inheritance of incompatible genomes in maize and Tripsacum dactyloides (2n = 72)
--E.P. Erygina and A.S. Mashnenkov

Two incompatible lines (T22 and Gk26) and a compatible one (Ig57) were used in a previously described experiment (MNL 65:72, 1991; MNL 68:51, 1994). In 1993, P1, P2, P3, F1, F2, BC1 ears were pollinated with Tripsacum dactyloides pollen according to the standard procedure (MNL 68:87, 1989).

Analysis of the ears and calculations of compatibility (c) were determined by the method developed in our laboratory (MNL 65:72, 1991). In the set of lines under research, genome incompatibility is governed by duplicate genes. The probable genetic formula of the lines is: A1 A1 a2 a2 - Gk26, A1 A1 A2 A2 - T22, a1 a1 a2 a2 - Ig57.
 
 

	Number of ears
Line or hybrid	without  developed kernels c=o	with developed kernels c>o	Expected ratio	X2
Gk26	8	0	8:0	0.00
T22	7	0	7:0	0.00
Ig57	0	13	0:13	0.00
Gk26 x T22	7	0	7:0	0.00
Ig57 x Gk26	4	0	4:0	0.00
BC1 (Gk26 x Ig57)	11	0	11:0	0.00
BC1 (T22 x Ig57)	10	0	10:0	0.00
BC1 (Ig57 x Gk26)	9	11	1:1	0.02
BC1 (Ig57 x T22)	13	4	3:1	0.37
F2 (Ig57 x Gk26)	17	5	3:1	0.06
F2 (Ig57 x T22)	19	1	15:1	0.05

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