In:
Genome, Canadian Science Publishing, Vol. 30, No. 5 ( 1988-10-01), p. 615-620
Abstract:
When protoplasts isolated from the leaves of haploid plants of Nicotiana plumbaginifolia Viviani were examined cytologically during in vitro culture, a small fraction was found to contain diplochromosomes at the first mitosis. DNA measurements of freshly isolated protoplasts revealed that 92% contained G1 and 8% contained G2 haploid nuclei. The origin of the diplochromosomes was investigated by a simplified sister chromatid differential staining technique and autoradiography. Our results showed that nuclear division in the G1 protoplasts was normal, with each round of DNA replication being followed by mitosis. In the G2 protoplasts, however, one extra round of DNA replication often took place before the nucleus entered mitosis.Key words: Nicotiana plumbaginifolia, protoplast culture, endoreduplication, sister chromatid differentiation.
Type of Medium:
Online Resource
ISSN:
0831-2796
,
1480-3321
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
1988
detail.hit.zdb_id:
2020635-5
SSG:
12
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