Abstract
The phytohormone ethylene is essential for ripening of climacteric fruits such as tomato. While many of the genes responsible for ethylene synthesis and perception have been identified, the regulatory network controlling autocatalytic climacteric ethylene synthesis is not well understood. In order to better understand the regulation of ripening-associated ethylene, we have exploited the genetic variation within Solanum Sect. Lycopersicon. In particular, we have used a near-isogenic population of S. habrochaites introgression lines to identify chromosome segments affecting ethylene emissions during ripening. S. habrochaites fruits produce much larger quantities of ethylene during ripening than do cultivated S. lycopersicum tomatoes. A total of 17 segments were identified; 3 had emissions more than twice the level of the tomato parent, 11 had less than a twofold increase and 3 had significantly reduced emissions at one or more ripening stages. While several of these segments co-segregate with known ethylene-related genes, many do not correspond to known genes. Thus, they may identify novel modes of regulation. These results illustrate the utility of wild relatives and their introgression lines to understand regulation of fruit ripening-related processes.
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Acknowledgments
This work was funded by grant number 2005-35304-15988 from the United States Department of Agriculture—National Research Initiative to H.K. We would like to thanks Adriana Sacco and Chima Okonkwo (Charles) for their help with fruit harvests. We are very grateful to Timothy Wills of the TGRC for supplying the seeds of the S. habrochaites NILs.
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Communicated by M. Havey.
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Dal Cin, V., Kevany, B., Fei, Z. et al. Identification of Solanum habrochaites loci that quantitatively influence tomato fruit ripening-associated ethylene emissions. Theor Appl Genet 119, 1183–1192 (2009). https://doi.org/10.1007/s00122-009-1119-x
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DOI: https://doi.org/10.1007/s00122-009-1119-x