Percorrer por autor "Kageyama, K."
A mostrar 1 - 3 de 3
Resultados por página
Opções de ordenação
- Extensive morphological and behavioural diversity among fourteen new and seven described species in Phytophthora Clade 10 and its evolutionary implicationsPublication . Jung, T.; Milenković, I.; Corcobado, T.; Májek, T.; Janoušek, J.; Kudláček, T.; Tomšovský, M.; Nagy, Z.Á.; Durán, A.; Tarigan, M.; Sanfuentes von Stowasser, E.; Singh, R.; Ferreira, M.; Webber, J. F.; Scanu, B.; Chi, N. M.; Thu, P. Q.; Junaid, M.; Rosmana, A.; Baharuddin, B.; Kuswinanti, T.; Nasri, N.; Kageyama, K.; Hieno, A.; Masuya, H.; Uematsu, S.; Oliva, J.; Redondo, M.; Maia, Cristiana; Matsiakh, I.; Kramarets, V.; O'Hanlon, R.; Tomić, Ž.; Brasier, C. M.; Horta Jung, M.During extensive surveys of global Phytophthora diversity 14 new species detected in natural ecosystems in Chile, Indonesia, USA (Louisiana), Sweden, Ukraine and Vietnam were assigned to Phytophthora major Clade 10 based on a multigene phylogeny of nine nuclear and three mitochondrial gene regions. Clade 10 now comprises three subclades. Subclades 10a and 10b contain species with nonpapillate sporangia, a range of breeding systems and a mainly soil-and waterborne lifestyle. These include the previously described P. afrocarpa, P. gallica and P. intercalaris and eight of the new species: P. ludoviciana, P. procera, P. pseudogallica, P. scandinavica, P. subarctica, P. tenuimura, P. tonkinensis and P. ukrainensis. In contrast, all species in Subclade 10c have papillate sporangia and are self-fertile (or homothallic) with an aerial lifestyle including the known P. boehmeriae, P. gondwanensis, P. kernoviae and P. morindae and the new species P. celebensis, P. chilensis, P. javanensis, P. multiglobulosa, P. pseudochilensis and P. pseudokernoviae. All new Phytophthora species differed from each other and from related species by their unique combinations of morphological characters, breeding systems, cardinal temperatures and growth rates. The biogeography and evolutionary history of Clade 10 are discussed. We propose that the three subclades originated via the early divergence of pre-Gondwanan ancestors > 175 Mya into water-and soilborne and aerially dispersed lineages and subsequently underwent multiple allopatric and sympatric radiations during their global spread.
- Taxonomy, biogeography and evolution of thirty-four taxa in Phytophthora Clade 7a including eleven new species from natural forests and updated descriptions for P. fragariae, P. rubi and the ‘P. ×alni hybrid complex’Publication . Nagy, Z. Á.; Horta Jung, M.; Milenković, I.; Kudláček, T.; Bourret, T.; Kageyama, K.; Hieno, A.; Masuya, H.; Uematsu, S.; Chi, N. M.; Thu, P. Q.; Chang, T-T; Fu, C-H; Corcobado, T.; Janoušek, J.; Májek, T.; Mullett, M.; Tomšovský, M.; Ferreira, M.; Singh, R.; Maia, Cristiana; Stanivuković, Z.; Tomić, Z.; Bakonyi, J.; Webber, J. F.; Brasier, C. M.; Jung, T.Over the past three decades, surveys in natural and managed ecosystems, driven mainly by forest biosecurity issues, have greatly expanded knowledge of the global diversity and biogeography of the plant pathogen genus . In subclade 7a alone, 16 new species were described raising the number of validly described species in this subclade to 18. Recently, in further surveys conducted in natural forests of Japan, Vietnam, Europe and North America, 11 more new Clade 7a species and one other 7a taxon have now been identified. All are considered to be endemic to the surveyed sites. They are formally described here, including their morphological properties, colony and temperature-growth characteristics and their phylogenetic relationships. Informal, updated descriptions without nomenclatural act are also presented for the known species , , , × and ×. With now 34 taxa including hybrids, Clade 7a is currently the largest subclade. It is essentially a Northern Hemisphere subclade, with a disjunct distribution in North America, Europe and Asia which probably reflects an original Laurasian ancestral distribution ~90-80 Mya and subsequent post-Laurasian migrations and radiations. It is comprised of predominantly soilborne and aquatic species with non-papillate non-caducous sporangia, though some may have facultative adaptations to a degree of aerial dispersal. The largest diversity hotspots are in Southeast and East Asia, and both adaptive sympatric and non-adaptive radiations are indicated in the data. All 22 'pure' or non-hybrid species are self-fertile and exhibit relatively low nuclear heterozygosity levels. In contrast, high heterozygosity levels, relatively high numbers of tri- and partly tetra-allelic sites and maternal lines partly shared with other Clade 7a taxa are consistent with ten of the taxa (30 %) originating via interspecific hybridisation. Of these five are self-fertile, but unusually, given their likely self-fertile parents, the other five, including the ' × hybrid complex', have an A1/A2 or outcrossing breeding system. Some of the hybrids, such as the '. × hybrid complex', are known to have emerged as a result of anthropogenic disturbance events. Numerous species, including several in Clade 7a, have become highly damaging pathogens of trees and agricultural crops as a result of historical introductions via global plant trade. However, for the 11 new species described here, no symptoms were observed at the natural sample sites and their natural and potential hosts are unknown. The same applies to well over 150 species in other Clades and subclades, representing a significant plant health evidence gap. It is recommended that the biosecurity risk to forests, natural ecosystems and agriculture posed by these previously scientifically unknown taxa be actively investigated.
- Worldwide forest surveys reveal forty-three new species in Phytophthora major Clade 2 with fundamental implications for the evolution and biogeography of the genus and global plant biosecurityPublication . Jung, T.; Milenković, I.; Balci, Y.; Janoušek, J.; Kudláček, T.; Nagy, Z. Á.; Baharuddin, B.; Bakonyi, J.; Broders, K. D.; Cacciola, S. O.; Chang, T.-T.; Chi, N. M.; Corcobado, T.; Cravador, Alfredo; Đorđević, B.; Durán, A.; Ferreira, M.; Fu, C.- H.; Garcia, L.; Hieno, A.; Ho, H.- H.; Hong, C.; Junaid, M.; Kageyama, K.; Kuswinanti, T.; Maia, Cristiana; Májek, T.; Masuya, H.; Magnano di San Lio, G.; Mendieta-Araica, B.; Nasri, N.; Oliveira, L. S. S.; Pane, A.; Pérez-Sierra, A.; Rosmana, A.; Sanfuentes von Stowasser, E.; Scanu, B.; Singh, R.; Stanivuković, Z.; Tarigan, M.; Thu, P. Q.; Tomić, Z.; Tomšovský, M.; Uematsu, S.; Webber, J. F.; Zheng, H.- C.; Zheng, F.- C.; Brasier, C. M.; Horta Jung, M.During 25 surveys of global Phytophthora diversity, conducted between 1998 and 2020, 43 new species were detected in natural ecosystems and, occasionally, in nurseries and outplantings in Europe, Southeast and East Asia and the Americas. Based on a multigene phylogeny of nine nuclear and four mitochondrial gene regions they were assigned to five of the six known subclades, 2a-c, e and f, of Phytophthora major Clade 2 and the new subclade 2g. The evolutionary history of the Clade appears to have involved the pre-Gondwanan divergence of three extant subclades, 2c, 2e and 2f, all having disjunct natural distributions on separate continents and comprising species with a soilborne and aquatic lifestyle and, in addition, a few partially aerial species in Clade 2c; and the post-Gondwanan evolution of subclades 2a and 2g in Southeast/East Asia and 2b in South America, respectively, from their common ancestor. Species in Clade 2g are soilborne whereas Clade 2b comprises both soil-inhabiting and aerial species. Clade 2a has evolved further towards an aerial lifestyle comprising only species which are predominantly or partially airborne. Based on high nuclear heterozygosity levels ca. 38 % of the taxa in Clades 2a and 2b could be some form of hybrid, and the hybridity may be favoured by an A1/A2 breeding system and an aerial life style. Circumstantial evidence suggests the now 93 described species and informally designated taxa in Clade 2 result from both allopatric non-adaptive and sympatric adaptive radiations. They represent most morphological and physiological characters, breeding systems, lifestyles and forms of host specialism found across the Phytophthora clades as a whole, demonstrating the strong biological cohesiveness of the genus. The finding of 43 previously unknown species from a single Phytophthora clade highlight a critical lack of information on the scale of the unknown pathogen threats to forests and natural ecosystems, underlining the risk of basing plant biosecurity protocols mainly on lists of named organisms. More surveys in natural ecosystems of yet unsurveyed regions in Africa, Asia, Central and South America are needed to unveil the full diversity of the clade and the factors driving diversity, speciation and adaptation in Phytophthora.