The chloroplast nucleoids of the bundle sheath and mesophyll cells ofZea mays
作者:
A. G. C. Lindbeck,
R. J. Rose,
M. E. Lawrence,
J. V. Possingham,
期刊:
Physiologia Plantarum
(WILEY Available online 1989)
卷期:
Volume 75,
issue 1
页码: 7-12
ISSN:0031-9317
年代: 1989
DOI:10.1111/j.1399-3054.1989.tb02055.x
出版商: Blackwell Publishing Ltd
关键词: Chloroplast DNA;chloroplast membranes;maize;nucleoid;thylakoid;Zea mays
数据来源: WILEY
摘要:
Dimorphic chloroplasts ofZea maysL. cv. GH5004 from bundle sheath and mesophyll cells contained similar amounts of DNA, while bundle sheath chloroplasts contained twice the number of nucleoids compared to mesophyll chloroplasts. On average bundle sheath nucleoids were half the size of mesophyll nucleoids and contained half as much DNA. Electron microscope autoradiography of the chloroplasts showed that the nucleoid DNA is associated with the thylakoids and in the case of mesophyll chloroplasts preferentially with the grana. These observations suggest that the differences in nucleoid distribution may be due to differences in membrane morphology, with the small nucleoids of agranal bundle sheath chloroplasts being widely dispersed.
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