NUCLEAR-CYTOPLASMIC INTERACTIONS AND PART IAL INSTABILITY OF REMOTE CEREAL HYBRIDS

Amphidiploid wheat hybrids are alloplasmic plants in which intergenomi c and nuclear-cytoplasmic interactions take place simultaneously. Part ial instability of hybrids, underlain by lack of equilibrium between g enomes (intergenomic disbalance), has been studied in sufficient detai l. However, current understanding of the role of nuclear-cytoplasmic d isbalance in hybrid stability is fragmentary and inconsistent. The rev iew focuses on nuclear-cytoplasmic interactions in distant hybrids of cereals, with emphasis on the role of nuclear-cytoplasmic disbalance i n the instability of wheat-rye recombinants.