Characterisation of <i>Phytophthora capsici</i> causing foot rot of black pepper (<i>Piper nigrum</i> L.) in Julau, Sarawak

Jin, Kong; Thanh, Tu Anh Vu; Yeo, Freddy Kuok San; Kueh, Kiong Hook

doi:10.1080/03235408.2022.2112537

Cited by 3 publications

(1 citation statement)

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“…To date, black pepper is cultivated mainly in the Central Highlands and the Southeast region of Vietnam with the total area increasing from 101,600 ha in 2015 to 147,500 ha in 2018, then reducing to 131,800 ha in 2020 (General statistics o ce 2021). Foot rot disease or "quick wilt disease" caused by Phytophthora capsici is the most destructive soilborne pathogen of black pepper in many countries of the world including Vietnam (Anandaraj 2000;Truong et al 2008 Kong et al 2022). Approximately 25-30% of the vine death of black pepper was reported in Kerala (Nambiar and Sarma 1977).…”

Section: Introductionmentioning

confidence: 99%

Current species of oomycetes associated with foot rot disease of black pepper in Vietnam

Thao,

Khanh,

Liem

et al. 2023

Preprint

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Foot rot disease caused by Phytophthora capsici is one of the most destructive diseases of black pepper in Vietnam and worldwide. However, many other oomycete species have also been recorded on this plant, and P. tropicalis and Pythium deliense were recently reported as serious threats to black pepper in India. On the other hand, the population of oomycetes occurring in black pepper plantations in Vietnam and their pathogenicity have not been investigated in the last decade. To this end, two hundred fifteen oomycete isolates were collected from the root rots and rhizospheric soil of black pepper in the Central Highlands andthe Southeast region of Vietnam. Of these, 23 isolates were representatively chosen based on their origin and morphology for DNA sequence analysis of the internal transcribed spacer (ITS) region, then 11 isolates were further selected for the translation elongation factor 1-alpha (TEF1- α) and the beta-tubulin (TUB) gene analyses. Morphology and molecular analysesindicated that P. capsici, P. tropicalis, P. nicotianae, P. cinnamomi, P. parvispora, P. heveae, Phytopythium vexans, and a novel species of Phytopythium were clearly identified among oomycete isolates. Of these, P. capsiciand P. tropicalis could be the prevalent species in black pepper plantations in studied areas. The inoculation tests demonstrated that all the isolates of P. capsici, P. tropicalis and P. nicotianae were pathogenic on both leaves and roots of black pepper. Phytopythium vexans was pathogenic on root only. Meanwhile, P. cinnamomi, P. parvispora, P. heveae and Phytopythiumsp. were non-pathogenic.

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Section: Introductionmentioning

confidence: 99%