| Authors | (Breda de Haan) Shoemaker 1959 |
|---|---|
| Strain | 12059 |
| Classification | Pleosporales, Pleosporaceae, Bipolaris |
| Culture collection | BCRC FU30164 |
| Detection frequency | High |
| Accession number | LC494363 |
| Figure |  Fig. 1 5-day-old colony on PDA  Fig. 2 Bipolaris oryzae. a–b. Conidiophores and conidia. c–d. Conidia. e. Symptoms of brown spot on rice (Bars= 5 μm, unless otherwise specified) |
| Colonies | Colonies on PDA attaining 69-, 75-, 3-mm at 24 °C, 28 °C and 37 °C after 5 days, margins entire or slightly sinuate, floccose, reverse azonate, initially pale brown, later becoming black from center. |
| Conidiophores | Conidiophores macronematous, brown, flexuous, septate, simple, up to 600 µm, 6–8.5 µm wide. |
| Conidiogenous cells | Conidiogenous cells integrated, terminal or intercalary, geniculate, sympodial. |
| Conidia | Conidia usually curved, navicular, pale brown to golden brown, 4–12 septate, 60–130 × 14–24 µm. |
| Note | During the study, it was found that conidia produced from fresh materialswere often distinctly darker than those from artificial culture. On several conventional media, the sporulation was poor. Sporulation can be induced by removing the lids, scraping the aerial hyphae and thereafter keeping them at low RH (below 95%). |
| Pathogenicity | This species can cause leaf brown spots at different growing stages of rice and seedling blight at seedling stage. |
| Specimens examined | Taiwan, Miaoli County, rice grains, Dec 2012, Jie-Hao Ou, 12059 Taiwan, Tainan City, rice grains (cultivar Tainan 11), Jul 2014, Jie-Hao Ou, 14082 Taiwan, Taitung County, rice grains (cultivar Taiken 2), Sep 2014, Jie-Hao Ou, 14128 Taiwan, Taitung County, rice grains (cultivar Kaohsiung 139), Oct 2014, Jie-Hao Ou, 14150 Taiwan, Taitung County, rice grains (cultivar Kaohsiung 139), Nov 2014, Jie-Hao Ou, 14158 Taiwan, Taitung County, rice grains (cultivar Taiken 2), Jan 2015, Jie-Hao Ou, 15002 Taiwan, Taitung County, rice grains (cultivar Taitung 16), Nov 2016, Jie-Hao Ou, 16039 Taiwan, Ilan County, rice grains(cultivar Kaohsiung 147), Jan 2017, Jie-Hao Ou, 17004 Taiwan, Miaoli County, rice grains (cultivar Miaoli 2), Dec 2014, Jie-Hao Ou, 14176 Taiwan, Taichung City, rice grains (cultivar Taichung 65), Feb 2015, Jie-Hao Ou, 15015 |
| ITS | TAACAAGGTCTCCGTAGGTGAACCTGCGGAGGGATCATTACACAACAAAATATGAAGGCCTGGCTTTCGCGGCCGGCTGAAGTATTTTTTTCACCCATGTCTTTTGCGCACTTGTTGTTTCCTGGGCGGGTTCGCCCGCCACCAGGACCAAACCATAAACCTTTTTTTTCTTATGCAGTTTCCATCAGCGTCAGTAAAAACAATGTAATTATTACAACTTTCAACAACGGATCTCTTGGTTCTGGCATCGATGAAGAACGCAGCGAAATGCGATACGTAGTGTGAATTGCAGAATTCAGTGAATCATCGAATCTTTGAACGCACATTGCGCCCTTTGGTATTCCAAAGGGCATGCCTGTTCGAGCGTCATTTGTACCTTCAAGCTTTGCTTGGTGTTGGGCGTTTTTTTGTCTCCCTCTTTCTGGGAGACTCGCCTTAAAACGATTGGCAGCCGGCCTACTGGTTTCGGAGCGCAGCACATTTTTTGCGCTTTGTATCAGGAGAAAAGGACGGTACTCCATCAAGACTCTACATTTTTCACTTTTGACCTCGGATCAGGTAGGGATACCCGCTGAACTTAA |