Phytophthora ×serendipita sp. nov. and P. ×pelgrandis, two destructive pathogens generated by natural hybridization

Abstract

The first natural hybrids in the genus Phytophthora were described in 1998, and they were the result of hybridization between P. nicotianae and P. cactorum. They were described formally as Phytophthora ×pelgrandis in 2009. In 2007 a second type of P. cactorum hybrid species was described, generated by hybridization between P. hedraiandra and P. cactorum; it is described formally here as P. ×serendipita sp. nov. The morphological description of P. ×pelgrandis was incomplete and here we also add several important diagnostic characters of P. ×pelgrandis that were not in its original description. In addition, ITS-SSCP profiles are presented confirming the hybrid identity of both P. ×pelgrandis and P. ×serendipita.

• hosts
• hybrids
• ITS-SSCP
• morphology

Acknowledgments

The authors thank József Bakonyi for morphological examination of the type strain of P. ×pelgrandis. We also thank Ewald Groenewald for sequencing the β-tub gene of P. ×pelgrandis and Edu Boer for technical assistance.