Pathogenicity of Xanthomonas Oryzae pv. oryzae Starains in Vietnam.

Noda, Takahito; Du, Pham Van; E, Lai Van; Dinh, Hoang Dinh; Kaku, Hisatoshi

doi:10.3186/jjphytopath.65.293

Cited by 10 publications

(9 citation statements)

References 3 publications

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“…Race G1, which was the prominent race throughout Vietnam as reported by Noda et al 10 , showed limited distribution and was only found in Hanoi and Hai Duong provinces in this study. Eight strains virulent to IRBB7 and belonging to G4 were distributed in Hai Duong, Hanoi, Hoa Binh, Ha Tay and Hung Yen provinces.…”

Section: Race Distributionmentioning

confidence: 52%

“…Xoo strains isolated mainly from the Mekong delta (southern Vietnam) were evaluated for virulence on a series of 11 near-isogenic lines and seven additional varieties, with 6 races identified by Noda et al 10 . Our results showed that predominant races between northern and southern Vietnam represented distinct populations of Xoo, indicating substantial geographical differentiation between the pathogen populations in different agroecosystems.…”

Section: Discussionmentioning

confidence: 99%

“…Accordingly, pathogenic or genetic diversity of the pathogen is expected. Northern Vietnam is one region where distribution of the pathogenic race has not previously been studied in detail, although the pathogenicity of Xoo in southern Vietnam was analyzed by Noda et al 10 .…”

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confidence: 99%

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Diversity in Virulence of Xanthomonas oryzae pv. oryzae from Northern Vietnam

Furuya¹,

Taura²,

Goto³

et al. 2012

JARQ

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A survey of the geographical distribution of pathogenic races of Xanthomonas oryzae pv. oryzae (Xoo) causing bacterial blight (BB) of rice in northern Vietnam was conducted. We characterized strains of Xoo collected from nine regions in this part of Vietnam in 2001 and 2002 using polymerase chain reaction (PCR)-based DNA fingerprinting and virulence analysis. The pathogenicity of Vietnamese 84 strains was tested for their virulence to BB near-isogenic lines with a single resistance gene. Based on virulence analysis using 11 differential lines (IR24, IRBB1, IRBB2, IRBB3, IRBB4, IRBB5, IRBB 7, IRBB10, IRBB11, IRBB21 and Taichung Native 1), each harboring a single resistance gene, four pathotypes (tentatively designated as races G1 to G4) were identified. All strains were virulent to the resistance genes Xa1, Xa2, Xa10, Xa11, Xa14 and Xa18, and xa5 and Xa21 were effective against a major portion of the Vietnamese Xoo population; followed by Xa7. Most of the Vietnamese hybrid and improved varieties cultivated in northern Vietnam were susceptible to all races and no Vietnamese variety was resistant to all races. Our study revealed that strains from northern Vietnam comprised two major races (G2 and G3) and two minor races (G1 and G4), which were widely distributed and detected at lower frequencies, respectively, in northern Vietnam. Seventy six strains of Xoo were analyzed by DNA fingerprinting using two PCR-based assays. Two groups, designated as clusters I and II, were respectively identified, in which cluster I contained race G4 strains and cluster II race G1 strains. Combining DNA and pathotype analysis, we hereby present the situation of Xoo recently isolated in northern Vietnam.

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Section: Race Distributionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 99%

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Diversity in Virulence of Xanthomonas oryzae pv. oryzae from Northern Vietnam

Furuya¹,

Taura²,

Goto³

et al. 2012

JARQ

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“…High-bacterial concentrations have been recorded in irrigation water, canals and in rice fields, although the natural presence of bacteriophages may limit such presence (Ou, 1985). Once entered into plants, the bacteria multiply in the epitheme, the cavity beneath the hydathode water pores, and then move to the xylem vessels (Mew, 1993;Noda et al, 1999) resulting in bacterial blight symptoms on the rice leaves. Xoo accumulates to very high concentrations in infected rice plants to produce a disease called bacterial leaf blight (BB).…”

Section: Xoo Life Cyclementioning

confidence: 99%

Pest categorisation of Xanthomonas oryzae pathovars oryzae and oryzicola

Jeger¹,

Candresse²,

Chatzivassiliou³

et al. 2018

EFS2

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The EFSA Panel on Plant Health performed a pest categorisation for Xanthomonas oryzae pathovars oryzae (Xoo) and oryzicola (Xoc), the causal agents of the bacterial blight and the bacterial leaf streak of rice, respectively. These pathovars are widely distributed in Asia, Africa and Australia. Xoo is also reported in some states of the USA and in some other countries of America. The identity of both pathovars is well established and efficient identification methods are available. The major host is cultivated rice (Oryza sativa), but different Oryza spp. as well as Poaceae weeds are reported as alternative hosts, with some uncertainty concerning the actual host range. Both pathovars are seed associated, despite the fact that seed transmission is still controversial for Xoo. Both pathovars are already regulated in Directives 2000/29/EC, on harmful organisms for plants, and 66/402/EEC, on the marketing of cereal seeds. The main pathway for entry is seed. Should these pathovars enter into EU, they may establish and spread, and they may have an impact on the rice crops, with uncertainties. The knowledge gaps identified are (1) the quantity of EU importation of rice seeds, (2) the risk of introduction through unprocessed rice for consumption, (3) the suitability of the EU growing climate conditions for the bacteria to establish and spread, (4) role of seed transmission (Xoo), (5) the role of weeds in the epidemiology and especially in seed transmission and dispersal, (6) host range of weeds. As none of the pathovars is known to occur in the EU, they do not meet one of the criteria for being considered as Union regulated non-quarantine pests. Nevertheless, both pathovars meet the criteria assessed by EFSA for consideration as Union quarantine pest.

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“…Noda et al (1999) identified 12 kinds of blast race among 129 isolates collected from all over the Mekong River Delta area in Vietnam; they used 12 Japanese DVs developed for Pia, Pik-s, Pii, Pik, Pik-m, Piz, Pita, Pita-2, Piz-t, Pik-p, Pib and Pit by Yamada et al (1976) and Kiyosawa (1981Kiyosawa ( , 1984. Mekwatanakarn et al (2000) investigated the pathogenicities of 527 blast isolates from Thailand using two kinds of set of near isogenic lines (NILs) for the resistance genes Pi1, , , Pi3,Pi4a and Pi4b(t) (Pita), Pi4a-PKT(t), , Pia,Pita,Pib, and Pik as DVs; the isolates were classified into 175 races.…”

Section: Introductionmentioning

confidence: 99%

Pathogenicity Analysis of Blast (Pyricularia oryzae Cavara) Isolates from West Africa

Odjo

Kawasaki-Tanaka

Noda

et al. 2014

JARQ

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To clarify the diversity of blast (Pyricularia oryzae Cavara) races in West Africa, we investigated the pathogenicity of 96 blast isolates collected from different ecosystems in six countries, Bénin, Burkina Faso, Côte-d'Ivoire, Ghana, Mali, and Nigeria, and characterized using rice (Oryza sativa L.) differential varieties for 23 resistance genes and a susceptible control variety Lijangxintuanheigu (LTH). Virulent blast isolates occurred with high frequencies against LTH or differential varieties carrying Pia, Pi19(t), Pi12(t), Pit, Pii, Pi3 and Pi5(t). Conversely, they occurred at low frequencies against differential varieties carrying Pish, Pi9(t), Piz, Piz-5, Piz-t and Pita-2 and at intermediate frequencies against those carrying Pib, Pi1, Pik, Pita and Pi20(t). The isolates were recharacterized as reaction types of five groups, U, i, k, z and ta; accordingly, LTH and the differential varieties were categorized based on the chromosome locations of the resistance genes harbored in each genetic background. Twelve, seven, thirteen, eight and seventeen reaction types were found in groups U, i, k, z and ta, respectively. Thirteen of these, namely U43, U63, i7, k100, k106, k177, z00, z03, z04, ta003, ta031, ta403 and ta431, showed high frequencies of blast isolates and were considered dominant reaction types. We used the infection types of the differential varieties against these blast isolates to conduct a cluster analysis, and the isolates were classified into two clusters, I and II. Substantial differences in frequencies between both clusters were found in the reactions of differential varieties carrying these genes in the Pii, Pik and Pita chromosome regions. Both clusters I and II were distributed in an upland ecosystem with high and similar frequencies, whereas group II was mainly distributed in the irrigated lowland. These results suggested that many types of blast races were distributed in the upland ecosystem, while the limited ones were in lowland in West Africa. Finally, these blast isolates were categorized into 79 races in accordance with a new designation system based on the five differential variety groups used for reaction typing.

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Pathogenicity of Xanthomonas Oryzae pv. oryzae Starains in Vietnam.

Cited by 10 publications

References 3 publications

Diversity in Virulence of Xanthomonas oryzae pv. oryzae from Northern Vietnam

Diversity in Virulence of Xanthomonas oryzae pv. oryzae from Northern Vietnam

Pest categorisation of Xanthomonas oryzae pathovars oryzae and oryzicola

Pathogenicity Analysis of Blast (Pyricularia oryzae Cavara) Isolates from West Africa

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