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The bottle gourd genome provides insights into Cucurbitaceae evolution and facilitates mapping of a Papaya ring‐spot virus resistance locus
Authors:Shan Wu  Md Shamimuzzaman  Honghe Sun  Jerome Salse  Xuelian Sui  Alan Wilder  Zujian Wu  Amnon Levi  Yong Xu  Kai‐Shu Ling  Zhangjun Fei
Affiliation:1. Boyce Thompson Institute, Cornell University, Ithaca, NY, USA;2. US Vegetable Laboratory, USDA‐Agriculture Research Service, Charleston, SC, USA;3. Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Beijing Key Laboratory of Vegetable Germplasm Improvement, National Engineering Research Center for Vegetables, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China;4. Institut National de la Recherche Agrinomique, Unités Mixtes de Recherche 1095, Genetics, Diversity and Ecophysiology of Cereals, Paleogenomics & Evolution (PaleoEvo) Group, Clermont‐Ferrand, France;5. State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Province Key Laboratory of Plant Virology, Institute of Plant Virology, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China;6. Department of Plant Protection, Fujian Agriculture and Forest University, Fuzhou, China;7. USDA‐Agricultural Research Service, Robert W. Holley Center for Agriculture and Health, Ithaca, NY, USA
Abstract:Bottle gourd (Lagenaria siceraria) is an important vegetable crop as well as a rootstock for other cucurbit crops. In this study, we report a high‐quality 313.4‐Mb genome sequence of a bottle gourd inbred line, USVL1VR‐Ls, with a scaffold N50 of 8.7 Mb and the longest of 19.0 Mb. About 98.3% of the assembled scaffolds are anchored to the 11 pseudomolecules. Our comparative genomic analysis identifies chromosome‐level syntenic relationships between bottle gourd and other cucurbits, as well as lineage‐specific gene family expansions in bottle gourd. We reconstructed the genome of the most recent common ancestor of Cucurbitaceae, which revealed that the ancestral Cucurbitaceae karyotypes consisted of 12 protochromosomes with 18 534 protogenes. The 12 protochromosomes are largely retained in the modern melon genome, while have undergone different degrees of shuffling events in other investigated cucurbit genomes. The 11 bottle gourd chromosomes derive from the ancestral Cucurbitaceae karyotypes followed by 19 chromosomal fissions and 20 fusions. The bottle gourd genome sequence has facilitated the mapping of a dominant monogenic locus, Prs, conferring Papaya ring‐spot virus (PRSV) resistance in bottle gourd, to a 317.8‐kb region on chromosome 1. We have developed a cleaved amplified polymorphic sequence (CAPS) marker tightly linked to the Prs locus and demonstrated its potential application in marker‐assisted selection of PRSV resistance in bottle gourd. This study provides insights into the paleohistory of Cucurbitaceae genome evolution, and the high‐quality genome sequence of bottle gourd provides a useful resource for plant comparative genomics studies and cucurbit improvement.
Keywords:bottle gourd     Lagenaria siceraria     genome sequencing  cucurbit genome evolution  Papaya ring‐spot virus resistance
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