2nd International Triticeae Symposium
Richard R-C. Wang
Cytomixis is a natural process of chromatin exchange among cells. In Iris confusa and I. japonica, the synchronized cytomixis takes place between PMC's during a stage just before meiosis. This process produces euploid and aneuploid offspring. The chromosome number of a fertile diploid plant is 30 (2n). Most accessions of I. confusa and I. japonica are sterile aneuploids. The chromosome numbers are varied, ranging 2n = 28 to 60. In Triticeae cytomixis plays an important role in spontaneous chromosome doubling or redoubling, resulting in the origin of auto-allopolyploidy and aneuploidy. We have obtained amphidiploid plants by spontaneous chromosome doubling. These plants indicate indirectly that cytomixis takes place in the macrosporocytes, giving rise to high level auto-allopolyploid Triticeae species.
Yen, Chi; Sun, GenLou; and Yang, Junliang, "The Mechanism of the Origination of Auto-allopolyploidy and Aneuploidy in Higher Plants Based on the Cases of Iris and Triticeae." (1994). Herbarium Publications. Paper 17.