Cytogenetics of Saccharum officinarum L., Saccharum spontaneum L. and S. officinarum×S. spontaneum Hybrids
I. Chromosome mosaics
1972 年 37 巻 4 号 p. 565-573
詳細
1972 年 37 巻 4 号 p. 565-573
Intraplant variation in chromosome numbers have been reported in the somatic cells of S. officinarum, pollen grains of S. spontaneum and microsporocytes of S. officinarum×S. spontaneum hybrids. The origin of the chromosome mosaics has been traced to the spindle abnormalities caused by genetic factors in the case of S. officinarum, unequal numerical distribution or elimination of univalents during meiosis in S. spontaneum and disturbances in the pre-meiotic mitosis in the interspecific hybrids. It is concluded that the alteration in chromosome numbers in the cells of individual plants followed by vegetative propagation and the functioning of pollen grains with varying chromosome numbers might have played a significant role in the evolution of the extensive euploid-aneuploid series reported in S. spontaneum.
