Interspecific variations in the chiasma frequencyand nuclear DNA content in some species ofFerocactus(Cactaceae)
作者:
P. Das,
S. Mohanty,
A.B. Das,
期刊:
Caryologia
(Taylor Available online 2000)
卷期:
Volume 53,
issue 2
页码: 159-162
ISSN:0008-7114
年代: 2000
DOI:10.1080/00087114.2000.10589191
出版商: Taylor & Francis Group
关键词: Cactus;cytophotometry;Ferocactus;meiosis;in situ DNA content
数据来源: Taylor
摘要:
Meiotic studies of pollen mother cells and nuclear 4C DNA content inten species ofFerocactus(Cactaceae) revealed significant interspecific variations.The haploid chromosome numbern=11was found in all the studied species. The chiasma frequency per nucleus varied from 18.20 in F. echidne to 21.75 in F.gracilisin meiotic metaphase I. The formation of univalent's in some of the cells and/or spindle anomalies lead to the formation of pentads, hexads or octads. Pollen sterility varied between 7.66% in F. emoryi to 9.74% in F.gracilis. The 4C DNA content in root tip cells varied from 7.37 pg in F.histrixand 9.74 pg in F.gracilis. Significant variations of in situ nuclear DNA content as well as chiasma number per bivalent was evidient in interspecific level.
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