Cytogenetical Investigations in Rutaceae V

Cytomorphology of three intergeneric hybrids of Citrus and Poncirus

抄録

Cytomorphological studies were conducted in three intergeneric hybrids, Citrus jambhiri×Poncirus trifoliata, C. reshni×P. trifoliata and (C. paradisi×C. reticulata)×P. trifoliata. The hybrids had various morphological characters intermediate to parents. Trifoliate leaf character was found to be dominant. Meiotic studies showed formation of nine bivalents and equal distribution of chromosomes at anaphase I and II in majority of PMCs indicating thereby the close homology between the genomes of two genera. Low pollen fertility was observed in C. jambhiri×P. trifoliata hybrid, whereas the reciprocal cross had high pollen fertility, indicating cytoplasmic nature of its inheritance.