Occurrence of the rice root nematode Hirschmanniella oryzae on monsoon rice in Myanmar

Maung, Zin Thu Zar; Kyi, Pyone Pyone; Myint, Yi Yi; Lwin, Thein; Waele, Dirk De

doi:10.1590/s1982-56762010000100001

Cited by 19 publications

(15 citation statements)

References 4 publications

(2 reference statements)

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“…In our study, H. oryzae root population density declined sharply between the heading stage and harvesting, while the soil population reached its highest peak of the rice-growing season. This observation supports previous reports that H. oryzae exit the decaying roots after flowering, which occur 2-3 days after the heading stage (Merny, 1972;Prot, 1994), resulting in low root population densities at harvest (Arayarungsarit & Junbuthong, 1988;Hendro et ctl, 1992;Youssef & El-Hamawi, 1996;Youssef, 1999;Islam et al, 2004;Maung, 2011). In the soil, H. oryzae may survive for several months waiting to infect newly formed rice roots (Walawala & Davide, 1984).…”

Section: Discussionsupporting

confidence: 89%

“…Our results are in agreement with previous observations by Kuwahara & Iyatomi (1970), cited by Fortuner& Merny (1979), who reported that, in Japan, the highest population density of H. oryzae in rice roots occurs at the heading stage irrespective of the date of planting. Maung (2011) observed the highest root population densities of H. oryzae at the milky grain stage which follows the heading stage. In our study, H. oryzae root population density declined sharply between the heading stage and harvesting, while the soil population reached its highest peak of the rice-growing season.…”

Section: Discussionmentioning

confidence: 85%

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Population dynamics of Meloidogyne graminicola and Hirschmanniella oryzae in a double rice-cropping sequence in the lowlands of Myanmar

Win¹,

Kyi

Maung³

et al. 2013

Nematol

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The rice root-knot nematode, Meloidogyne graminicola, and the rice root nematode, Hirschmanniella oryzae, are considered potentially important nematode pathogens in lowland rice. A study was undertaken from December 2009 until December 2010 in the Ayeyarwady River Delta, the major lowland rice-producing area of Myanmar, to monitor the population dynamics of M. graminicola and H. oryzae in a naturally infested field. Root samples of the two rice varieties Yatanartoe and Taungpyan that are commonly cultivated in double rice-cropping sequences in Myanmar and represent irrigated and rainfed lowland rice varieties, respectively, were obtained for nematode analysis. During the summer-irrigated rice-growing season the root population density of second-stage juveniles (J2) of M. graminicola showed two distinct peaks -at the maximum tillering stage of the rice plants in January and at the heading stage of the rice plants in March 2010. With the onset of the monsoon rains, the J2 population densities in the roots of ratoon rice plants gradually decreased in May. During the rainfed monsoon rice-growing season, very low population densities of M. graminicola J2 were detected in the roots of rice plants, while the root population density of H. oryzae juveniles and adults showed two distinct peaks -at the maximum tillering stage of the rice plants in August and at the heading stage of the rice plants in October 2010. With the onset of the dry season, population density ofH. oryzae in the roots reached the lowest density at harvest in November. Root galling caused by M. graminicola followed the same trend as the J2 population densities throughout the irrigated season. No root galls were observed during the monsoon season. Our results can be used for practical purposes aimed at a better management of both M. graminicola and H. oryzae.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 85%

Population dynamics of Meloidogyne graminicola and Hirschmanniella oryzae in a double rice-cropping sequence in the lowlands of Myanmar

Win¹,

Kyi

Maung³

et al. 2013

Nematol

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“…Several species are a serious economic threat to lowland rice fields in South and Southeast Asia (Bridge et al, 1990;Prot et al, 1994;Karssen, 2009;Maung et al, 2010;Win et al, 2013). For example, when H. oryzae (van Breda de Haan, 1902) Luc & Goodey, 1964 was present in the field before rice seedlings were transplanted, tiller growth was reduced by up to 50-60% and yield production decreased by at least 25% (Ou, 1985;Jairajpuri & Baqri, 1991).…”

mentioning

confidence: 99%

Deceptive morphological variation in Hirschmanniella mucronata (Nematoda: Pratylenchidae) and a polytomous key to the genus

Khun

Decraemer

Couvreur

et al. 2015

Nematol

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Hirschmanniella mucronata populations isolated from two Cambodian provinces were characterised using morphological, morphometric and molecular criteria. Examination of 1024 specimens from 60 different paddy fields revealed high intraspecific variation in morphology and morphometrics, especially in tail terminus shape and stylet length. Sequence results confirmed that morphologically divergent individuals represent a single species, suggesting that neglecting morphological variation has led to an overestimation of Hirschmanniella diversity in former studies. Phylogenetic analysis of the SSU, D2-D3, LSU and ITS1-5.8S-ITS2 regions revealed three concordant clades, H. mucronata having a sister relationship with H. kwazuna and H. loofi. Plotting the diagnostic features, including tail terminus shape, stylet length and lip region morphology on the phylogenetic framework, revealed that none of them supported the clades and represented convergent features. All three molecular markers were able to discriminate all Hirschmanniella species, but the D2-D3 region was the easiest, fastest and most successful region to be amplified. Species delimitation and the diagnostic features of Hirschmanniella were re-evaluated. Hirschmanniella abnormalis and H. exacta are considered to be junior synonyms of H. oryzae and H. mannai a species inquirenda. Finally, a list of valid species with indication of synonyms and a polytomous key are provided

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“…These results confirm those of several research studies on rice parasitic nematode communities. Indeed, several studies have noted the predominance of nematodes belonging to the genus Hirschmanniella known as the most frequent and most damaging to rice in lowland and irrigated ecologies (Coyne et al, 2000;Ravichandra et al, 2003;Bridge et al, 2005;Maung et al, 2010;Udo et al, 2011;Thio et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Occurrence, abundance and distribution of plant-parasitic nematodes associated with rice (<i>Oryza</i> spp.) in different rice agroecosystems in Togo

Gnamkoulamba¹,

Tounou²,

Tchabi³

et al. 2018

Int. J. Bio. Chem. Sci

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Rice is the second most important cereal in Togo. Among constraints that affect rice production, plant parasitic nematodes are of great importance. The objective of this study was to determine the distribution, abundance and frequency of plant nematodes in different agroecological zones of Togo. A total of 50 composite soil and root samples (25 each) were taken from 25 fields (5 per zone) randomly selected from the five agroecological zones. Nematodes were extracted from 100 ml soil and 1g fresh root samples using the Hermann techniques. Nematodes were then fixed and mounted on slide and identified to genus level using identification keys. The survey documented twelve plant-parasitic nematode genera among which ten, (Hirschmanniella spp., Meloidogyne spp., Xiphinema spp., Scutellonema spp., Helicotylenchus spp., Heterodera spp., Criconema spp., Pratylenchus spp., Trichodorus spp. and Tylenchid spp.), were recorded from lowland, two (Helicotylenchus and Scutellonema) from upland and five (Dolichodorus spp., Helicotylenchus spp., Tylenchorhynchus spp., Scutellonema spp. and Xiphinema spp.), from flooded ecosystem. Hirschmanniella spp., Meloidogyne spp and Helicotylenchus spp. were the most frequent and abundant plant-parasitic nematode genera recorded from more than 71% of the samples. Helicotylenchus spp., Hirschmanniella spp., Meloidogyne spp. and Scutellonema spp., were recorded in both soil and root samples while Pratylenchus spp., Heterodera spp. and Tylenchorhynchus spp., were found to be associated to root and Trichodorus spp., Tylenchid spp., Xiphinema spp., Criconema spp. and Dolichodorus spp., were recorded from soil samples only. The high diversity of nematode genera recorded in the survey is attributed to the rice ecosystem, which is mostly characterized by lowland ecosystem with intensive cropping. This study established the evidence that nematodes could be important constraints for rice production, suggesting further research focusing on their damage potential and development of effective rice nematode management strategy for sustainable rice production in Togo.

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Occurrence of the rice root nematode Hirschmanniella oryzae on monsoon rice in Myanmar

Cited by 19 publications

References 4 publications

Population dynamics of Meloidogyne graminicola and Hirschmanniella oryzae in a double rice-cropping sequence in the lowlands of Myanmar

Population dynamics of Meloidogyne graminicola and Hirschmanniella oryzae in a double rice-cropping sequence in the lowlands of Myanmar

Deceptive morphological variation in Hirschmanniella mucronata (Nematoda: Pratylenchidae) and a polytomous key to the genus

Occurrence, abundance and distribution of plant-parasitic nematodes associated with rice (<i>Oryza</i> spp.) in different rice agroecosystems in Togo

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