The possible origin and relation of Phytophthora katsurae and P-heveae, discovered in a protected natural forest in Taiwan
Other Title
在台灣的自然保護林內所發現的 Phytophthora katsurae 同 P. heveae 之可能來源及關係
Journal
Botanical Studies
Journal Volume
47
Journal Issue
3
Pages
273-277
Date Issued
2006-07
Date
2006-07
Author(s)
Wen-Hsiung Ko
S. Y. Wang
P. J. Ann
Abstract
When a total of 531 soil samples collected from 1976 to 2000 from various locations distrib-uted in every county on the island of Taiwan was assayed, sixteen isolates of Phytophthora katsurae and nine isolates of P. heveae were recovered from three and four counties, respectively. Phytophthora katsurae and P. heveae were isolated from a protected natural forest located atop a hill at Lenhuachih without higher land within the range of vision, suggesting that both species are indigenous to Taiwan. Phytophthora katsurae is distinguished from the similar P. heveae by its verrucose oogonial wall. The number of protrusions produced by the Taiwanese isolates of P. katsurae varied greatly ranging from 2 to 23 per oogonium, indicating the unsteadiness of this taxonomical characteristic. Oogonia produced by isolates of P. katsurae obtained from Hawaii contained very few protrusions. Moreover, most oogonia produced by two of these isolates did not have any protrusions and were indistinguishable from those produced by P. heveae. Results suggest the devel-opment of P. heveae directly from P. katsurae by loss of oogonial protrusions. The high level of ITS sequence similarity between P. heveae and P. katsurae in comparison with their relationships to other Phytophthora species tested also support the possibility of the recent development of one species from the other species.
Subjects
Phytophthora heveae
Phytophthora katsurae
Oogonial protrusion
Indigenous
Publisher
Springer
Type
journal article