| No other wheat lines, of similar or dissimilar genetic origins not even
the 9 other F2 families of identical genetic origin, grown under
the same conditions were affected. Neither were, pistilloid anthers present
in cv. Aotea1) incorporated into T. timopheevi cytoplasm
through cv. Bison; they were typically indehiscent, flared or curled at
the base as in most CMS lines. The pistillody recorded by CALDER in Solid
Strawn Tuscan x (F4 White Fife x Benefactor) occurred in a line
closely related to the New Zealand cv. Cross 7 (Tuscan x White Fife) which
is half of the genetic background of cv. Aotea (Copp 1958). The material
reported on here will differ in only very few chromosome segments from cv.
Aotea. Is it possible that anther pistillody in New Zealand wheat is an
infreuent mutation of a gene derived from Tuscan or White Fife associated
with chromosome 6B or 7A? At the same time as observations were being made on cv. Aotea we examined for pistillody field grown plants of spring sown hexaploid wheat raised from the open-pollination of lines incorporating cytoplasmic male sterility through cv. Bison. Very slightly or slightly pistilloid anthers were present in 44 plants of the 70 examined, and this character was expressed in 39% of the anthers checked in those plants. In none of them did pistillody approach the condition seen in the cv. Aotea material described above. T. timopheevi cytoplasm may, therefore, be associated with very slight pistillody in hexaploid wheat, though KIHARA (1966) did not find it so. Acknowledgments We thank Dr. J. M. MCEWAN, Crop Research Division. D.S.I.R. for permission to use his crosses, and Mr. I. LANCASTER of the same Division for raising F3 plants under controlled conditions. Literature Cited COPP, L. G. L. 1958. Aotea wheat-a replacement for Cross 7. N.Z. Jl. Agric. 96: 210-214. BHATIA, C. R. and M. S. SWAMINATHAN 1963. An induced multiple carpel mutation in bread wheat. Genetica 34: 58-65. CALDER, J. W. 1930. Carpellody in the wheat flower and its inheritance. Trans. N.Z. Inst. 61: 391- 401. KIHARA, H. 1951 Substitution of nucleus and its effects on genome manifestation. Cytologia 16: 177-193. KIHARA, H. 1966. Nucleus and chromosome substitution in wheat and Aegilops. I. Nucleus substitution. Proc. II Int. Wheat Genet. Symp. 313-327. KIHARA, H. 1967. Cytoplasmic male sterility in relation to hybrid wheat breeding. Zuchter 37: 86-93. KIHARA, H. and K. TSUNEWAKI 1961. pistillody of Triticum durum induced by an alien cytoplasm. Seiken Ziho 12: 1-10. KIHARA, H. and K. TSUNEWAKI 1967. Genetic principles applied to the breeding of crop plants. In "Heritage from Mendel" ed. R. A. Brink. University of Wisconsin Press, Madison. LEIGHTY, C. E. and W. J. SANDO 1924. Pistillody in wheat flowers. J. Hered. 15: 263-268. SEARS, E. R. 1954. The 'aneuploids of common wheat. Missouri Ag. Expt. Stn. Bull. 572. TSITSIN, N. V. and V. F. LUBIMOVA 1959. New species and forms of cereals derived from hybridization between wheat and couch grass. Amer. Nat. 93: 181-191. (Received July 25, 1970) |
| 1) Aotea8 x CMS Bison |
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