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Infection biology of Phytophthora palmivora Butl. in Durio zibethinus L. (Durian) and responses induced by phosphonate

O'Gara, E., Sangchote, S., Fitzgerald, L., Wood, D., Seng, A.C. and Guest, D.I. (2004) Infection biology of Phytophthora palmivora Butl. in Durio zibethinus L. (Durian) and responses induced by phosphonate. In: Drenth, A. and Guest, D.I., (eds.) Diversity and Management of Phytophthora in Southeast Asia. Australian Centre for International Agricultural Research, Canberra, pp. 42-52.

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We investigated the infection biology of Phytophthora palmivora on durian leaf and fruit. Zoospores of P. palmivora are preferentially attracted to fresh wounds in durian and such wounds are shown to be key infection courts. Overlapping layers of peltate trichomes cover the stipules, lower surface of the leaf, petiole, young stem and fruit, and are the first point of contact between the pathogen and the host on these tissues. The pathogen binds randomly to the surface of the trichomes but is unable to penetrate the heavily lignified walls, however the hypha can grow over the edge of the trichome until it reaches the epidermal surface beneath. The stomata that occur beneath the trichomes on all tissues are readily infected by the advancing hyphal strands, and are also major infection courts. When infection occurs through fresh wounds in leaves, lesions appear within 2 days and leaves are entirely diseased within 6 days. Treatment of durian seedlings with phosphonate before inoculation with P. palmivora led to a significant restriction of the pathogen, but only if leaves were inoculated while still attached to the tree, and not if they were excised before inoculation. Phenylalanine ammonia lyase activity was not stimulated in excised inoculated leaves from phosphonate-treated durian seedlings, compared to untreated seedlings.

Item Type: Book Chapter
Murdoch Affiliation(s): Centre for Phytophthora Science and Management
School of Biological Sciences and Biotechnology
Publisher: Australian Centre for International Agricultural Research
Copyright: © Australian Centre for International Agricultural Research
Notes: ACIAR Monograph 114 - Paper from The First Regional Workshop on Phytophthora in Southeast Asia, Chiang Mai, Thailand, 8th-12th November 2002
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