Abstract: types of alien cytoplasm were used to study on the allopasmic effects on chromosome behaviors at meiosis in hybrids between alloplasmic Triticum aestivum with rey and triticale.It was observed that(a) D²-type cytoplasm from Ae.crassa(4x)appears to inhinit the pairing of homologues and to promote the homoeologue pairing;(b)S-type cytoplasm from Ae.sharonesis shows the effects of promoting homologous chromosome pairing;(c)G-type cytoplasm from T.timopheevi and T.zhukovskyi possesses the ability to produce functional female gametes;(d)s^v-type cytoplasm from Ae.kotshyi inhibits pairing of both homologues and homoeologue.Male sterile octoploid triticale lines with G, S^V, and D²-type cytoplasm have been synthesized and the male sterility induced by D²-type cytoplasm is a photosensitive which was found to be express under daylight more than 15 hors.

Key words: Alloplasmic, Homoeologue pairing