Genetic Male-sterility in Wheat: Inheritance1
- Chao-Chien Jan and
- C. O. Qualset2
UC9109-9 is a male-sterile common wheat (Triticum aestivum L.) that occurred as a homozygous male-sterile F3 line from the cross of two fully fertile genotypes, D6301 and ‘Ramona 50’. UC9109-9 can be maintained as homozygous “male-sterile” by a low level (5%) self-pollination. Full fertility was restored in the F1 generation of all crosses studied, including 13 common wheats of diverse origin. Inheritance studies showed that the malesterility was controlled by nuclear genes. Data from F2 and backcross generations supported a genetic model that resulted in male-sterility only when three independent recessive ms genes were present. The cultivars ‘Rulofen’, ‘Sonora 64’, ‘Menflo’, ‘Calidad’, ‘Siete Cerros 66’, ‘Nainari 60’, ‘Lerma Rojo’, Ramona 50 and ‘Insignia’ have no ms genes; cultivars ‘Pitic 62’ and ‘Triple Dirk’ and breeding line D6301 were likely heterogeneous, having none, one, or two ms genes and ‘Onas 53’ has one ms gene. UC9109-9 could have arisen by recombination if Ramona 50 is also heterogeneous and has plants with an ms gene. The original male-sterile F3, appeared from a population of 140 random lines, consistent with the expectation of 1 in 64 for three genes. It is believed that at least two ms genes in UC9109-9 trace to ‘Norin 10’, through Norin 10-‘Brevor’, one of the parents of D6301. UC9109-9 produces a low proportion of florets with pistilloid anthers (nonfertile); but is typical of male-sterile wheats in other respects.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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