Abstract
Sour cherry (Prunus cerasus L.) is an allotetraploid and both sweet cherry (P avium L.) and ground cherry (P. fruticosa Pall.) are the proposed progenitor species. The study investigated the maternal species origin(s) of sour cherry using chloroplast DNA (cpDNA) markers and a diverse set of 22 sweet, 25 sour, and 7 ground cherry selections. Two cpDNA restriction fragment length polymorphisms (RFLPs) and one polymerase chain reaction (PCR) fragment length polymorphism were identified among the 54 selections. The three polymorphisms considered together resolved four haplotypes. Analysis of sour cherry progeny indicated that the chloroplast genome is maternally inherited and therefore appropriate to use in determining maternal phylogenetic relationships. Ground cherry was found more likely than sweet cherry to be the maternal progenitor species of sour cherry since 23 of 25 of the sour cherry selections had the most prevalent ground cherry haplotype. However, the other two sour cherry selections tested had the most prevalent sweet cherry haplotype and a wild French sweet cherry selection had the most prevalent ground cherry haplotype. The results underscore the importance of using diverse Prunus germplasm to investigate phylogenetic relationships.
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