Mating type and fertility of Magnaporthe grisea populations from rice in Ningxia Hui autonomous region, China
Li-Wen-Qiang; Wang-Yuan-Chao; Zheng-Xiao-Bo
Zhongguo Shuidao Kexue 21(6): 650-656
2007
Accession: 021326093
To determine mating type and fertility of Magnaporthe grisea populations from rice in Ningxia Hui Autonomous Region, northwestern China, four hundred and sixty isolates from different rice varieties were tested with high fertile standard testers including TH12 (MAT1-1), KA3 (MAT1-1), TH16 (MATI-2), and Guyl I (MAT1-2) in 2002 - 2005. Of the 460 monoconichal isolates, 363 (78. 9%) were fertile and produced perithecia when paired with either of the four testers, and 97 (21. 1 %) were infertile and did not produce perithecia when mated with any of the four testers. All fertile isolates were male fertile and belonged to a single mating type, MAT1-1, no female fertile and hermaphroditic isolates were detected in sample populations. Among the 363 fertile isolates, 79 (21. 8%) produced perithecia, asci, and ascospores, others produced only barren perithecia. Mating type distribution and fertility status were irrespective of the host variety or geographical location or year of collection of isolates. In a PCR-based mating type assay, the total 460 M. grisea field isolates were identified as MAT1-1, which entirely corroborated the result of standard mating assays using fertile testers. The presence of only one mating type and the absence of female fertile isolates indicated that sexual reproduction was rare or absent in M. grisea populations associated with rice in Ningxia Hui Autonomous Region, northwestern China.