Abstract. Afandi A, Subandiyah S, Wibowo Hieno Afandi, Loekito Suga H, Kageyama K. 2021. Population genetics analysis of Phytophthora nicotianae associated with heart rot in pineapple revealed gene flow between populations. Biodiversitas 22: 3342-3348. has caused pineapple. This study identified the population genetic diversity P. nicotianae, collecting 90 isolates from plantation sites three p...

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. × s...

Cembranoids produced by tobacco glandular trichomes have bioactivities in resistance to insect pests and pathogens. Cembratrien-ol synthase (CBTS) plays a key role the biosynthesis of cembranoids directly determines cembranoid content tobacco. This study examined effect changing CBTS1 expression on pest Spodoptera frugiperda oomycete pathogen Phytophthora nicotianae. The CDS sequence was cloned...

Abstract Annual and herbaceous perennial ornamental bedding plants are popular, high value crops in the southeastern United States. However, many of these subject to root or crown rot caused by Phytophthora species. In North Carolina, nicotianae Breda de Haan, drechsleri Tucker, cryptogea Pethybr. & Laff., and/or tropicalis Aragakia J.Y. Uchida cause this disease greenhouse production syste...

Zoospore exudates play important roles in promoting zoospore communication, homing and germination during plant infection by Phytophthora. However, it is not clear whether exudates affect plant immunity. Zoospore-free fluid (ZFF) and zoospores of P. nicotianae were investigated comparatively for effects on resistance of Arabidopsis thaliana Col-0 and mutants that affect signaling mediated by sa...

ABSTRACT A microbioassay was developed for the discovery of compounds that inhibit Phytophthora spp. This assay uses a 96-well format for high-throughput capability and a standardized method for quantitation of initial zoospore concentrations for maximum reproducibility. Zoospore suspensions were quantifiable between 0.7 and 1.5 x 10(5) zoospores per ml using percent transmittance (620 nm). Sub...

The photoactivated toxin, cercosporin, produced by Cercospora species, plays an important role in pathogenesis of this fungus to host plants. Cercosporin has almost universal toxicity to cells due to its production of reactive oxygen species including singlet oxygen. For that reason, Cercospora species, which are highly resistant to their own toxin, are good candidates to identify genes for res...

Phytophthora root rot caused by Phytophthora nicotianae is an economically important disease in pepper crops. The use of suppressive composts is a low environmental impact method for its control. Although attempts have been made to reveal the relationship between microbiota and compost suppressiveness, little is known about the microorganisms associated with disease suppression. Here, an Ion To...