| Authors | (Bugnic. ex M.B. Ellis) Manamgoda, L. Cai & K.D. Hyde 2012 |
|---|---|
| Strain | 12003 |
| Classification | Pleosporales, Pleosporaceae, Curvularia |
| Culture collection | BCRC FU30160 |
| Detection frequency | Medium |
| Accession number | LC494362 |
| Figure |  Fig. 1 5-day-old colony on PDA  Fig. 2 Curvularia hawaiiensis. a, c. Conidiophores and conidia. b. Conidia (Bars= 5 μm, unless otherwise specified) |
| Colonies | Colonies on PDA attaining 51-, 66-, 18-mm at 24 °C, 28 °C and 37 °C after 5 days, margins entire, floccose, reverse dark olivaceous to black with white margins. |
| Conidiophores | Conidiophores macronematous, often arising from funiculose bundles of mycelium, brown to dark brown, flexuous, septate, simple or rarely branched, up to 100 µm, 3.5–5 µm wide. |
| Conidiogenous cells | Conidiogenous cells integrated, terminal or intercalary, geniculate, sympodial, with darkened and thickened conidial scars. |
| Conidia | Conidia straight, cylindrical, smooth, with slightly darkened and thickened hilum, brown, (1–)3–5 distoseptate(mostly 5). Ratio of 1-, 2-, 3-, 4-, 5-septate conidia=3:0:9:5:42. 1-septate conidia 9–12 × 3–6 µm; 2-septate conidia 10–14 × 4–6 µm; 3-septate conidia 13–21 × 4–6 µm; 4-septate conidia 18–22 × 5–6.5 µm; 5-septate conidia 18–26 × 5.5–7.5 µm. |
| Note | Strain 12003 shares 100% and 98.56% identities in ITS and RPB2 regions with the ex-type strain of Curvularia hawaiiensis (CBS 173.57; HG778988, HG779166).
This species was first discovered by Bugnicourt (1955) from rice seeds under the name of Helminthosporium hawaiiense. Uchida & Aragaki (1979) transferred this species to Bipolaris based on their conidia having distosepta with bipolar type of germination and bearing on geniculate conidiophores. Manamgoda et al. (2012), based on the phylogenetic analysis, figured out that species attributed to Bipolaris with straight and short (<100 μm) conidia were nested within Curvularia, and should be moved to Curvularia. Accordingly this species was transferred to Curvularia hawaiiensis. This species is morphologically similar to C. beasleyi, but can be distinguished by having wider conidia with more septa. |
| Pathogenicity | This species is often found on rice seeds and may be associated with rice discoloration (Misra & Dharam, 1988). This species was reported to cause leaf spot in Pakistan (Aslam et al., 2019). |
| Specimens examined | Taiwan, Tainan City, rice grains (cultivar Tainan 11), Sep 2012, Jie-Hao Ou, 12003 Taiwan, Changhua County, rice grains, May 2014, Jie-Hao Ou, 14072 Taiwan, Taichung City, rice grains (cultivar Taichung 65), Feb 2015, Jie-Hao Ou, 15009 |
| ITS | GAAGTAAAAGTCGTAACAAGGTCTCCGTAGGTGAACCTGCGGAGGGATCATTACACAATAAAATACGAAGGCCGTTCGCGGCTGGACTATTTATTACCCTTGTCTTTTGCGCACTTGTTGTTTCCTGGGCGGGTTCGCTCGCCACCAGGACCACAATATAAACCTTTTTTATGCAGTTGCAATCAGCGTCAGTATAACAAATGTAAATCATTTACAACTTTCAACAACGGATCTCTTGGTTCTGGCATCGATGAAGAACGCAGCGAAATGCGATACGTAGTGTGAATTGCAGAATTCAGTGAATCATCGAATCTTTGAACGCACATTGCGCCCTTTGGTATTCCAAAGGGCATGCCTGTTCGAGCGTCATTTGTACCCTCAAGCTTTGCTTGGTGTTGGGCGTTTTTGTCCCCCCCAAAAAGGGGACTCGCCTTAAAAGGATTGGCAGCCGGCCTACTGGTTTCGCAGCGCAGCACATTTTTGCGCTTGCAATCAGCAAAAGAGGACGGCAATCCATCAAGACTCCTTCTCACGTTTGACCTCGGATCAGGTAGGGATACCCGCTGAACTTAA |
| RPB2 | CGTCGAACGAACACCCCCGTTGGACGTGATGGTAAGTTGGCAAAGCCGCGACAGCTTCACAACTCTCATTGGGGTCTTGTCTGCCCTGCTGAGACCCCCGAAGGACAGGCTTGCGGTCTGGTCAAGAACTTGTCTCTTATGTGTTATGTCAGTGTTGGTAGCGATGCATCGCCCATTATCGACTTCATGACACAACGTAACATGCAGCTTCTCGAAGAGTACGACCAGAACCAGAACCCGGATGCGACCAAGGTCTTCGTCAACGGTGTCTGGGTTGGTGTTCATTCAAATGCTCAGCAACTTGTCACGGTCGTGCAGGAGCTTCGCCGCAATGGAACTCTGTCTTACGAGATGAGTTTGATTCGTGACATTCGTGACAGAGAGTTCAAGATCTTCACAGATGCGGGGCGTGTCATGAGGCCTTTGTTCGTTGTAGAAAACGATATTCGAAAGCCAAACCGGAACCACCTCATCTTCACCAAGGAAATCAGCAACAAGCTCAAGGCTGAACAGCAAGAGACCAGTACAAGACAAGGCTGGAGTCAAGAGGAAGTCGAGCAGGCTACATACGGCTGGAGGGGTCTCATTCAAGACGGTGTCGTTGAATACCTCGATGCCGAGGAAGAAGAAACTGCAATGATAACATTCTCTCCCGAGGATTTGGAAGAATGGCGGGAAATGAAGATGGGTTTGCCTGCAGCCGAGCGATCAACTGAAGGCAAGGATCGACTTCGCCGTCTCAAGCCACTACCAGATCCTCGCATCCACGCCTACACCCATTGTGAGATTCACCCAGCTATGATCTTGGGTATTTGCGCCAGTATCATTCCCTTCCA |