| Frequency and geographical distribution of rye with
accessory chromosomes in Korea Woong-Jik LEE and Byung-Re MIN Department of Biology, College of Education, Seoul National University, Seoul, Korea It is known that rye in Korea possesses very high frequency of accessory or B-chromosomes. Seeds of rye were collected from various localities in Korea in 1962 and 1963, and were grown in the experiment field. In the following springs, spikes were fixed in acetic alcohol with a trace of ferric chloride for the observation of meiosis in PMC. In addition, spikes were obtained from two rye fields directly. The frequncy and geographical distribution of accessory chromosomes in Korean rye are shown in Figure on the cover and Table 1. The data are summarized as follows. (1) 32 populations of rye investigated were found to contain plants with accessory chromosomes. The frequency ranged from 2 to 73.3% with 30-40% as the mode. (2) In total, plants with two accessory chromosomes seem to be most stable among plants with accessory chromosomes in population as previously mentioned by MUENTZING. |