Journal
PLANT JOURNAL
Volume 83, Issue 4, Pages 600-609Publisher
WILEY
DOI: 10.1111/tpj.12912
Keywords
host-microbe interaction; genome; resistance gene analogs; Zizania; Jiaobai
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Funding
- State Key Lab of Rice Biology of China
- Zhejiang Key Lab of Crop Germplasm Resources
- Gordon and Betty Moore Foundation
- National Natural Science Foundation of China [31000357, 30921140408]
- National Science and Technology Ministry of China [2012BAD27B01]
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Despite the importance of host-microbe interactions in natural ecosystems, agriculture and medicine, the impact of long-term (especially decades or longer) microbial colonization on the dynamics of host genomes is not well understood. The vegetable crop Jiaobai' with enlarged edible stems was domesticated from wild Zizania latifolia (Oryzeae) approximately 2000years ago as a result of persistent infection by a fungal endophyte, Ustilago esculenta. Asexual propagation via infected rhizomes is the only means of Jiaobai production, and the Z.latifolia-endophyte complex has been maintained continuously for two centuries. Here, genomic analysis revealed that cultivated Z.latifolia has a significantly smaller repertoire of immune receptors compared with wild Z.latifolia. There are widespread gene losses/mutations and expression changes in the plant-pathogen interaction pathway in Jiaobai. These results show that continuous long-standing endophyte association can have a major effect on the evolution of the structural and transcriptomic components of the host genome. Significance Statement This study reports the genome of Jiaobai, a unique crop species domesticated from wild Zizania latifolia (Oryzeae) as a consequence of persistent infection by a fungal endophyte. Cultivated Z.latifolia (Jiaobai') has a significantly smaller repertoire of immune receptors compared with wild Z.latifolia, showing that continuous long-standing endophyte association can have a major effect on the evolution of the host genome.
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