Abstract
Sour rot, caused by Geotrichum citri-aurantii, is a major postharvest disease of citrus，and it causes serious economic losses. In this study, a high-quality genome sequence of G. citri-aurantii was obtained by Single Molecule Real-Time Sequencing (SMRT). Approximately 5.43 Gb of clean data were obtained and a total of 27.94-Mb genomic sequence was mapped to 10 chromosome groups after high-through chromosome conformation capture (Hi-C) assembly. In addition, three polygalacturonase genes which were related to pathogenicity in G. citri-aurantii genome were discovered. And transcriptome data of guazatine-resistance had been analyzed, the results showed that the guazatine-resistance of G. citri-aurantii was related to two ATP-binding cassette (ABC) transporter family genes, six major facilitator superfamily (MFS) transporter family genes and two multidrug and toxic compound extrusion (MATE) transporter family genes. In summary, our research may provide novel insights into the effective control of this pathogen.
Highlights
Citrus grow in more than 100 countries and is one of the most produced fruit genus
We found three polygalacturonase (PG) genes related to pathogenicity and ten genes related to guazatine-resistance from molecular level
The intensity of the interaction at the diagonal position is higher than the position of the nondiagonal line, and the results indicated that the interaction between adjacent sequences is higher in the Hi-C assembled chromosome but not in nonadjacent sequences, which is consistent with the principle of Hi-C helper genome assembly
Summary
Sour rot, caused by Geotrichum citri-aurantii , is a major postharvest disease of citrus,and it causes economic losses. Sour rot, caused by Geotrichum citri-aurantii (Ferraris), is one of the most important fungal diseases of citrus fruits, affecting all species and cultivars in the world[1]. During the period of harvest, storage, transport and handling, citrus fruits are exposed to the G. citri-aurantii pathogen and can be infected through wounds[3], especially during rainy seasons. Despite the severe damage caused by G. citri-aurantii, its infection mechanism and genetic information have not been thoroughly elucidated. Many researchers have tried to control citrus sour rot by physical control, chemical control and biological control[4,5,6,7]. Obtaining genome information is one of the main strategies to elucidate pathogen infection mechanisms
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