Abstract
The crossabilities of five wheat varieties with four clones of Hordeum bulbosum and eight genotypes of maize were investigated using the injection treatment of 2, 4-dichlorophenoxyacetic acid (2, 4-D) after pollination. Three of the five wheat varleties were not crossable with H. bulbosum regardless of the 2, 4-D treatment. On the other hand, an average of 22.1% of wheat florets from all these varieties formed immature embryos when pollinated with maize and followed by the 2, 4-D treatment. For 20 wheat varieties from West Asia and North Africa, an average of 9.5% of wheat florets pollinated with maize produced wheat haploids. This contrasts with a frequency of 0.2% in case of pollination with H. bulbosum.
