Cross direction for successful production of F1 hybrids between Triticum and Aegilops species.

F1 hybrids between Triticum aestivum L. (cv. Chinese Spring, Chinese Spring nulli 5B tetra 5D, cv. Roazon, cv. Rusałka, line CZR 1406), Triticum durum Desf. cv. Grandur, Triticum turgidum (L.) Thell. cv. Rampton Rivet and seven Aegilops species - Ae. cylindrica Host., Ae. triuncialis L., Ae. variabilis (peregrina) Eig., Ae. ventricosa Tausch., Ae. crassa Boiss. 6x, Ae. juvenalis (Thell.) Eig., Ae. triaristata Willd. 6x were synthesized. In hybrid seeds, embryos and endosperms were observed. The endosperm was mostly well developed but the embryo varied from almost normal to poorly developed. Hybrids were generated directly from cultured in vitro immature embryos. The total of thirty-eight F1 plants were obtained. Crossability of Aegilops spp. as female with Triticum spp. was about seven times higher (15.30% on average) than in reciprocal crosses (1.99% on average).