Cornell University

Switchgrass vs Bipolaris oryzae: a challenge in breeding for resistance

Wednesday, June 13, 2018 at 12:20pm to 1:10pm

Emerson Hall, 135

Switchgrass (Panicum virgatum L.) suffered from germination reduction from Bipolaris seed rot (BSR) and in yield reduction from Bipolaris leaf spot (BLS) caused by a necrotrophic ascomycete fungus named Bipolaris oryzae (Breda de Haan) Shoemaker. To manage the diseases breeding, switchgrass for resistance and silicon amendment were two potential approaches. Screening methods in a greenhouse were established for BSR in seeds and BLS in 4-week-old seedlings. The progress of resistance to BSR was over 50% cycle-1 in both cultivars whereas the progress of resistance to BLS was not significant. To dissect the resistance to BLS, a multi-trait Genome-wide association was conducted in Northern association panel. The BLS evaluation was conducted in 479 mature switchgrass via field evaluation, leaf detachment, and disk leaf assay. Multi-trait GWAS from different phenotype combinations revealed potential resistance genes encoding Myb, cytochrome P450, isocitrate lyase, E3 ubiquitin-protein, etc. Nevertheless, silicon amendment showed no improvement of resistance to both BSR and BLS

Event Type

Special Event

Departments

Plant Breeding and Genetics

Tags

pbg, sips, sips seminar

Speaker

Kittikun Songsomboon

Speaker Affiliation

Plant Breeding and Genetics, Cornell University

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