<i>Rhizoctonia oryzae‐sativae</i>, causal agent of aggregate sheath spot disease of rice, found in Myanmar

Aye, Seint San; Myint, Yi Yi; Lwin, Thein; Matsumoto, Masaru

doi:10.1111/j.1365-3059.2009.02111.x

Cited by 3 publications

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“…In this same survey, three isolates from samples of rice plants in Daikoo Township (MWC2) and Hlegu Township (MWC3 and MCW5) were collected from plants that displayed oval shaped lesions, 1–3 cm in length with bleached straw‐coloured centres surrounded by brownish borders. These symptoms were different from those caused by R. oryzae‐sativae (Aye et al ., 2009).…”

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confidence: 61%

“…Ten days after isolation, mature cultures on potato dextrose agar formed irregular masses of salmon ‐coloured sclerotia formed at the sub‐surface of the medium. This differed from the tan, irregular globose sclerotia formed by R. oryzae‐sativae (Aye et al ., 2009). Multinucleate cells were observed under light microscope by hyphal staining with Safranin O.…”

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confidence: 66%

“…Rice diseases reduce yields and are a major concern in Myanmar (Naing, 2004), and a recent survey documented the occurrence of Rhizoctonia oryzae‐sativae from diseased rice sheaths in Myanmar (Aye et al ., 2009). In this same survey, three isolates from samples of rice plants in Daikoo Township (MWC2) and Hlegu Township (MWC3 and MCW5) were collected from plants that displayed oval shaped lesions, 1–3 cm in length with bleached straw‐coloured centres surrounded by brownish borders.…”

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confidence: 99%

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First report of Rhizoctonia oryzae isolated from bordered sheath spot of rice in Myanmar

et al. 2010

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Rice diseases reduce yields and are a major concern in Myanmar (Naing, 2004), and a recent survey documented the occurrence of Rhizoctonia oryzae-sativae from diseased rice sheaths in Myanmar (Aye et al., 2009). In this same survey, three isolates from samples of rice plants in Daikoo Township (MWC2) and Hlegu Township (MWC3 and MCW5) were collected from plants that displayed oval shaped lesions, 1-3 cm in length with bleached straw-coloured centres surrounded by brownish borders. These symptoms were different from those caused by R. oryzae-sativae (Aye et al., 2009).Ten days after isolation, mature cultures on potato dextrose agar formed irregular masses of salmon -coloured sclerotia formed at the subsurface of the medium. This differed from the tan, irregular globose sclerotia formed by R. oryzae-sativae (Aye et al., 2009). Multinucleate cells were observed under light microscope by hyphal staining with Safranin O. According to the morphological criteria, the causal agent was initially identified as R. oryzae. Ribosomal DNA-ITS sequence data of isolate MWC2 (GenBank Accession No. FJ66520) were matched with all other available data sources in GenBank and were found to have up to 98% identity with R. oryzae (EU152861).A pathogenicity test was completed by inoculating the tillers of 10-week-old rice plants with isolates MWC2, MWC3 and MWC5 (three plants for each isolate). A five-day-old mycelial plug was placed on the stem one cm below the axil of the fully mature leaf and wrapped with parafilm. Similar symptoms to those observed in the field were produced five to seven days after stem inoculation, while control plants did not produce any symptoms. Koch's postulates was completed by re-isolating and confirming the identity as R. oryzae. In Australia, yield losses caused by R. oryzae and R. oryzae-sativae were as high as 10% and 20%, respectively (Lanoiselet et al., 2005). Occurrence of bordered sheath spot caused by R. oryzae has been reported in paddy fields of Japan (Inagaki, 1996), however, this is the first report in Myanmar.

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First report of Rhizoctonia oryzae isolated from bordered sheath spot of rice in Myanmar

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“…Further, Koch's postulate has proved the identity and confirmation of the pathogen, following the modified method of Aye et al, (2009). Sterilized soil was taken in pots.…”

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First report of Ceratorhiza oryzae-sativae, a fungus naturally causing aggregate sheath spot disease of rice in Manipur

Vignesh¹,

Devi²,

Sinha³

et al. 2023

EEC

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Rice is cultivated and consumed worldwide being a cereal crop of chief importance. There are numerous soil-borne fungi causing diseases of huge economic losses to production of rice. A survey of soil-borne fungi of rice was conducted in different valley districts of Manipur, and symptoms appearing as lesions, water-soaked spots near the waterline which often coalesces, forming concentric lesion bands were spotted. Among the collected symptomatic samples, a fungus, Ceratorhiza oryzae - sativae was identified. An internal transcribed sequence of the isolated fungus was generated and an NCBI accession number, MH255604 acquired. This disease might become severe in near future in all rice-growing fields of the state, and identification of this pathogen shall be essential for developing the management strategies.

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Biocontrol of Phytopathogenic Fungi of Rice Crop Using Plant Growth-Promoting Rhizobacteria

Gad

Deka

Ibrahim

et al. 2014

Microbial Diversity and Biotechnology in Food Security

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Rhizoctonia oryzae‐sativae, causal agent of aggregate sheath spot disease of rice, found in Myanmar

Cited by 3 publications

References 2 publications

First report of Rhizoctonia oryzae isolated from bordered sheath spot of rice in Myanmar

First report of Rhizoctonia oryzae isolated from bordered sheath spot of rice in Myanmar

First report of Ceratorhiza oryzae-sativae, a fungus naturally causing aggregate sheath spot disease of rice in Manipur

Biocontrol of Phytopathogenic Fungi of Rice Crop Using Plant Growth-Promoting Rhizobacteria

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