Abstract: In crossing eight alloplasmic lines of"Chinese Spring" with four lines of octoploid trititrigia, 8 groups and 32 forms of alloplasmic trititrigia were produced.It has shown that obvious differences on seed-set rate of crossing generation and fertility of backerossing offsprings relate to not only different types of alloplasm and also different backerossing parents as well, so that is a obvious interaction between nuclears and cytoplasm. Different types of alien eytoplasm influence F1's characters including plant height, tillering number, mature Period and kernal plumpness. Chromosome pairing in PMCs of F1 hybrids was compared among crossing combinations.

Key words: Cytoplasm, Trititrigia, Nuclear-Cytoplasmic hybrid