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Chemical profiling of Red romaine (Lactuca sativa var. longifolia) Thurinus RZ Lettuce Cultivar

ABSTRACT: Lettuce is a widely consumed leafy vegetable, valued for its nutritional benefits and culinary versatility. Various breeding initiatives have yielded lettuce varieties such as romaine or cos lettuce (Lactuca sativa var. longifolia), characterized by pigmented germplasm and enhanced tolerance to elevated temperatures. Despite its significance, a notable need exists for targeted study investigations into its chemical composition. Thus, this study aims to define the volatile and non-volatile components of the red romaine Thurinus RZ lettuce cultivar using LC-MS and GC-MS analysis. For LC-MS analysis, a C18 column will be accompanied by gradient elution using (A) water and (B) acetonitrile, each containing 0.1% formic acid as the mobile phase. For GC-MS analysis, the HP-5 column will be accompanied by Helium as the carrier gas. The molecules determined will then be ionized, and fragments will be interpreted and annotated using the mass-to-charge (m/z) ratio, which will further be tabulated.

INSTRUMENT(S): GCMS

ORGANISM(S): Red Romaine Lettuce

SUBMITTER: Cj Clanyns De Jesus

PROVIDER: MSV000097600 | MassIVE | Thu Apr 10 16:53:00 BST 2025

REPOSITORIES: MassIVE

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Project description:Lettuce (Lactuca sativa L.) is a highly perishable horticultural crop with a relatively short shelf life due to leaf senescence that limits its commercial value and contributes to food waste. Postharvest senescence varies with influences of both environmental and genetic factors. Preharvest genetic factors can be indicative of postharvest quality. Discovery of additional preharvest markers to assess lettuce shelf life is an important step towards increasing the efficiency of lettuce breeding efforts for improved shelf life. We selected and evaluated three romaine lettuces with variable shelf lives with the aim of identifying preharvest markers of lettuce postharvest shelf life. We evaluated leaf morphological characteristics for each of the three cultivars. To assess molecular indicators of shelf life, we used an RNA sequencing approach to construct transcriptomic profiles of two of the cultivars, a short shelf life (SSL) breeding line 60184 and a long shelf life (LSL) cultivar ‘Okeechobee’ at maturity. We identified 552 upregulated and 315 downregulated differentially expressed (DE) genes between the genotypes. We found that 27 % of the DE lettuce genes had an Arabidopsis thaliana ortholog characterized as senescence-associated, indicating that variable expression of senescence-associated genes (SAGs) could serve as a tool for preharvest markers of postharvest shelf life. Notably, we identified several SAGs and functional groupings with highly differential expression between the cultivars. This includes several jasmonate ZIM-domain (JAZ), jasmonic acid (JA) signaling genes, chlorophyll a-b binding (CAB) chloroplast-associated genes, and cell wall modification genes including pectate lyases (PL) and expansins (EXP). This study presented an innovative approach for identifying molecular markers for preharvest factors linked to postharvest traits for prolonged shelf. These genes could potentially be developed further as preharvest predictors of shelf life for lettuce breeding

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Chemical profiling of Red romaine (Lactuca sativa var. longifolia) Thurinus RZ Lettuce Cultivar

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