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(American Journal of Botany. 2007;94:1333-1337.)
© 2007 Botanical Society of America, Inc.

Population Biology

Inheritance of chloroplast DNA is not strictly maternal in Silene vulgaris (Caryophyllaceae): evidence from experimental crosses and natural populations1

David E. McCauley2, Allyson K. Sundby, Maia F. Bailey3 and Mark E. Welch

Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235 USA

ABSTRACT

Chloroplast DNA (cpDNA) is maternally inherited in the majority, but not all, of angiosperm species. The mode of inheritance of cpDNA is a critical determinant of its molecular evolution and of its population genetic structure. Here, we present the results of investigations of the inheritance of cpDNA in Silene vulgaris, a plant used in a variety of studies in which cpDNA is an important component. PCR/RFLP markers were used to compare mother and offspring cpDNA genotypes sampled from two natural populations, and mother, father, and offspring genotypes obtained from controlled greenhouse crosses. Ten of 215 offspring cpDNA genotypes studied in the controlled crosses and three of 156 offspring from natural populations did not match that of the mother, demonstrating rare nonmaternal inheritance. That the chloroplast genome is occasionally transmitted through pollen is discussed in the context of using S. vulgaris cpDNA as a marker in studies of seed dispersal and when considering the joint evolution of the chloroplast and mitochondrial genomes.

Key Words: Caryophyllaceae • chloroplast DNA • maternal inheritance • paternal leakage • Silene vulgaris






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