Mitochondria, Plastids and DNA inheritance
robison1 at husc10.harvard.edu
Tue Feb 15 12:48:47 EST 1994
cummins at possum.murdoch.edu.au (Jim Cummins) writes:
>" Direct evidence of plastid DNA and mitochondrial DNA in sperm cells
>in relation to biparental inheritance of organelle DNA in Pelargonium
>zonale by fluorescence electron microscopy" A Kuroiwa,et al Eur J
>Cell Biol (1993) 62: 307-313
>According to this paper's abstract both plastids and mitochondria
>contain DNA and may show biparental inheritance.
>(1) Is there any other evidence that plastids contain unique DNA?
Yes, though you probably already knew that -- it just most people
aren't familiar with the term plastid -- the generic name
covering chloroplasts, cyanelles, chromoplasts, etc.
>(2) Is there any other evidence of biparental inheritance of
>non-nuclear DNA? I thought maternal inheritance was obligatory.
Maternal or paternal inheritance is known for organelles. Many plants
inherit plastids (that word again! :-) from one parent and mitochondria
from the other, while others inherit both from the same parent.
Biparental inheritance of organelles is a rare phenomenon as
far as I know (in Chlamydomonas, a green alga, rare biparental
organelle inheritance events have been used to recombinationally
map the organelle genomes).
Department of Cellular and Developmental Biology
Department of Genetics / HHMI
krobison at nucleus.harvard.edu
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