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At the same time, a M3 composed of three ears-progenies from each M2 plant was grown during the winter 1968-69 in a greenhouse at the Research Station for Agronomy, Zurich-Reckenholz. One ear of each M3 plant was bagged. The average seed set was very low. It was therefore impossible to carry out a statistical analysis.

The M4 from these bagged M3 ears was grown in a greenhouse at Nyon in the spring 1969. Following segregations have been observed:



The homogeneity test gives a value of chi2=7.46.

These results indicate that male sterility is determined by a single recessive gene. At this stage, this conclusion only applies to the genotype of the variety Probus. Further investigations are needed for studying the expression of this gene in other genotypes. For this gene, we propose the designation msa1 for male sterile aestivum 1.

Literature cited

BOZZINI, A. and G. T. SCARASCIA-MUGNOZZA 1968. A factor for male sterility inherited as a Mendelian recessive. Euphytica Suppl. No. 1 : 83-86.

KRUPNOV, V. A. 1968. Genic male sterility in wheat (Triticum aestivum) Genetika H. 10 : 28-35 in Plant Breed. Abstr., 1969, 39(3) : 4409.

PUGSLEY, A.T. and R.N. ORAM 1959. Genic male sterility in wheat. Austr. P1. Breed. Genet. Newslett. 14.

(Received December 15, 1969)


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