| The gametocidal actions of the Ae. triuncialis, Ae.
sharonensis, and Ae. longissima chromosomes, belonging
to homoeologous group 3, 2, and 4, respectively, were studied in double
monosomic additions for each two of the chromosomes, and these three chromosomes
were proved to have different gametocidal actions (Endo 1982). In the double
monosomic additions for the Ae. triuncialis chromosome and
the Ae. sharonensis or Ae. longissima chromosome,
both gametocidal chromosomes are indispensable for the gametes to function
normally; namely, the gametocidal action of the Ae. triuncialis
chromosome can not be suppressed by the Ae. sharonensis or
Ae. longissima chromosome and vice versa. In the double
monosomic addition for the Ae. sharonensis and Ae.
longissima chromosomes, only the Ae. longissima chromosome
is needed for normal functioning of the gametes, which means that the Ae.
longissima chromosome can suppress the gametocidal action of the
Ae. sharonensis chromosome but the latter chromosome can not
suppress the gametocidal action of the former one. Thus, there are at least
three types of gametocidal chromosomes with respect to their gametocidal
action and homoeology. The gametocidal chromosomes isolated from different accessions of each of Ae. sharonensis and Ae. longissima were found to fall into two types, and those of the same homoeology, group 2 or group 4, from the different species have the same gametocidal action (Endo 1985). References ENDO, T.R. 1978. On the Aegilops chromosomes having gametocidal action on common wheat. Proc. 5th Int. Wheat Genet. Symp., New Delhi, India. pp. 306-314. ENDO, T.R. 1979. Selective gametocidal action of a chromosome of Aegilops cylindrica in a cultivar of common wheat. Wheat Inf. Serv. 50: 24-28. ENDO, T.R. 1982. Gametocidal chromosomes of three Aegilops species in common wheat. Can. J. Genet. Cytol. 25: 210-214. ENDO, T.R. 1985. Two types of gametocidal chromosome of Aegilops sharonensis and Ae. Iongissima. Jpn. J. Genet. 60: 125-135. ENDO, T.R. & KATAYAMA, Y. 1978. Finding of a selectively retained chromosome of Aegilops caudata L. in common wheat. Wheat Inf. Serv. 47-48: 32-35. ENDO, T.R. & TSUNEWAKI, K. 1975. Sterility of common wheat with Aegilops triuncialis cytoplasm. J. Hered. 66: 13-18. MAAN, S.S. 1975. Exclusive preferential transmission of an alien chromosome in common wheat. Crop Sci. 15: 287-292. MILLER, T.E. 1983. Preferential transmission of alien chromosomes in wheat. Kew Chromosome Conference II. pp. 173-182. MILLER, T.E., HUTCHINSON, J. & CHAPMAN, V. 1982. Investigation of a preferentially transmitted Aegilops sharonesis chromosome in wheat. Theor. Appl. Genet. 61: 27-33. TSUJIMOTO, H. & TSUNEWAKI, K. 1984. Gametocidal genes in wheat and its relatives. I. Genetic analyses in common wheat of a gametocidal gene derived from Aegilops speltoides. Can. J. Genet. Cytol. 26: 78-84. |
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