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Quantitative Trait Loci Analysis Identifies a Prominent Gene Involved in the Production of fatty Acid-Derived Flavor Volatiles in Tomato

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Molecular Plant 2018年第9期11卷 1147-1165页

作者： Karolina Garbowicz Zhongyuan Liu Saleh Alseekh Denise Tieman Mark Taylor Anastasiya Kuhalskaya Itai Ofner Dani Zamir Harry J. Klee Alisdair R. Fernie Yariv Brotman Max-Planck-lnstitute of Molecular Plant Physiology Potsdam-Golm Germany Horticultural Sciences Plant Innovation Center University of Florida Gainesville FL USA Center of Plant System Biology and Biotechnology 4000 Plovdiv Bulgaria Department of Life Sciences Ben-Gurion University of the Negev Beersheba Israel Robert H. Smith Institute of Plant Sciences and Genetics Faculty of Agriculture Hebrew University of Jerusalem Rehovot 7610001 Israel These authors contributed equally to this article

To gain insight into the genetic regulation of lipid metabolism in tomato, we conducted metabolic trait loci （mQTL） analysis following the lipidomic profiling of fruit pericarp and leaf tissue of the Solanum pennellii introgression lines （IL）. To enhance mapping resolution for selected fruit-specific mQTL, we profiled the lipids in a subset of independently derived S. pennellii backcross inbred lines, as well as in a nearsogenic sub-iL population. We identified a putative lecithin：cholesterol acyltransferase that controls the levels of several lipids, and two members of the class III lipase family, LIP1 and LIP2, that were associated with decreased levels of diacylglycerols （DAGs） and triacylglycerols （TAGs）. Lipases of this class cleave fatty acids from the glycerol backbone of acylglycerols. The released fatty acids serve as precursors of flavor volatiles. We show that LIP1 expression correlates with fatty acid-derived volatile levels. We further confirm the function of LIP1 in TAG and DAG breakdown and volatile synthesis using transgenic plants. Taken together, our study extensively characterized the genetic architecture of Upophilic compounds in tomato and demonstrated at molecular level that release of free fatty acids from the glycerol backbone can have a major impact on downstream volatile synthesis.

关键词： lipidomics lipids lipase volatile fa-voc Z-4-decenal

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