Abstract
Examination of several Japanese and Indian varieties of rice indicates that both the Indian and the Japanese types are in two groups, one with two nucleoli and the other with four in the somatic telophase, corresponding to the number of SAT-chromosomes.The behaviour of nucleolar chromosomes in preventing the fusion of nucleoli in the prophase of meiosis is described.The basic chromosome number for Oryza sativa L. is confirmed by observations of secondary association as five.The 2n number for Oryza coarctata Roxb. is determined for the first time as 48.The modifications in the nucleolar chromosomes are discussed in relation to changes in chromosome complement.
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