Plants evolved so that their flowering is triggered by seasonal changes in day length1. However, day-length sensitivity in crops limits their geographical range of cultivation, and thus modification of the photoperiod response was critical for their domestication2,3,4,5,6,7,8,9,10,11. Here we show that loss of day-length-sensitive flowering in tomato was driven by the florigen paralog and flowering repressor SELF-PRUNING 5G (SP5G). SP5G expression is induced to high levels during long days in wild species, but not in cultivated tomato because of cis-regulatory variation. CRISPR/Cas9-engineered mutations in SP5G cause rapid flowering and enhance the compact determinate growth habit of field tomatoes, resulting in a quick burst of flower production that translates to an early yield. Our findings suggest that pre-existing variation in SP5G facilitated the expansion of cultivated tomato beyond its origin near the equator in South America, and they provide a compelling demonstration of the power of gene editing to rapidly improve yield traits in crop breeding.
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We thank all members of the Lippman lab and Y. Eshed for valuable discussions. We also thank M. Koornneef for his constant support and useful discussions. We thank C. Brooks, A. Krainer and J. Dalrymple for technical support; T. Mulligan; S. Vermylen; A. Krainer from CSHL; K. Dunn and M. Treat from Robert Treat Farm in Milford, Connecticut; and staff from Cornell University's Long Island Horticultural Research and Extension Center in Riverhead, New York, for assistance with plant care. We thank U. Tartler and A. Lautscham for their help at the Max Planck Institute for Plant Breeding Research. This research was supported by an EMBO Long-Term Fellowship (ALTF 1589-2014 to S.S.), the Next-Generation BioGreen 21 Program (PMBC, PJ011912012016 to S.J.P.), the German Research Foundation (DFG project number SCHM2793/1-1 to I.S.), the Max Planck Society (I.S.), the German Research Foundation under the German-Israeli Project Cooperation program (DFG DIP project number FE552/12-1 to J.M.J.-G.), the National Science Foundation Plant Genome Research Program (IOS-1237880 to J.V.E. and Z.B.L.), BARD (IS-4818-15 to Z.B.L.), the US-Israel Binational Agricultural Research & Development fund (Z.B.L.), and an Agriculture and Food Research Initiative competitive grant from the USDA National Institute of Food and Agriculture (2016-67013-24452 to Z.B.L.).
S.S., S.J.P. and Z.B.L. have filed a PCT patent application based in part on this work (US Provisional Application No. 62/320,439) with the US Patent and Trademark Office.
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Soyk, S., Müller, N., Park, S. et al. Variation in the flowering gene SELF PRUNING 5G promotes day-neutrality and early yield in tomato. Nat Genet 49, 162–168 (2017). https://doi.org/10.1038/ng.3733
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