Inflorescence development and the role of LsFT in regulating bolting in lettuce (Lactuca sativa L.)
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PROVIDER: PRJNA422994 | ENA |
REPOSITORIES: ENA
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Project description:Lettuce (Lactuca sativa L.) is one of the most important leafy vegetable that is consumed during its vegetative growth. The transition from vegetative to reproductive growth is induced by high temperature, which has significant economic effect on lettuce production. However, the progression of floral transition and the molecular regulation of bolting are largely unknown. Here we morphologically characterized the inflorescence development and functionally analyzed the FLOWERING LOCUS T (LsFT) gene during bolting regulation in lettuce. We described the 8 developmental stages during floral transition process. The expression of LsFT was negatively correlated with bolting in different lettuce varieties, and was promoted by heat treatment. Overexpression of LsFT could recover the late-flowering phenotype of ft-2 mutant. Knockdown of LsFT by RNA interference dramatically delayed bolting in lettuce, and failed to respond to high temperature. Therefore, this study dissects the process of inflorescence development and characterizes the role of LsFT in bolting regulation in lettuce.
2018-02-14 | GSE108260 | GEO
Project description:Bolting is a key process in the growth and development of lettuce (Lactuca sativa L.). High temperature can induce earlier bolting which decreases in both quality and production of lettuce. However, knowledge underlying lettuce bolting is still lacking. To better understand the molecular basis of bolting, a comparative proteomics analysis was conducted on lettuce stems in the bolting period induced by high temperature (33 °C) compared with a control (20 °C) using iTRAQ-based proteomics, phenotypic measures, and biological verifications. High temperature induced lettuce bolting, while control temperature did not. Of the 6656 proteins identified, 758 proteins significantly altered their expression level induced by high-temperature relative to the control, of which 409 were up-regulated and 349 down-regulated. Proteins with abundance level change were mainly involved in photosynthesis, carbohydrate metabolism, stress response, hormone synthesis, and signal transduction. These differential proteins were mainly enriched in pathways associated with photosynthesis and tryptophan metabolism involving in auxin (IAA) biosynthesis. Among the differentially expressed proteins associated with photosynthesis and tryptophan metabolism were up-regulated. Moreover, in gibberellin (GA) biosynthesis pathway, 10 of main enzymes of P450 were up-regulated. Proteins related to SAUR and GRP, implicated in IAA and GA signal transduction were up-regulated, and the phosphorylation and ubiquitination related proteins regulating IAA and GA signal transduction were also induced. These findings indicate that a high temperature enhances the function of photosynthesis, IAA and GA synthesis and signal transduction to promote the process of bolting, which is in line with the physiology and transcription levels of IAA and GA metabolism. Our data provide a first comprehensive dataset for gaining novel understanding of the molecular basis underlying lettuce bolting induced by high temperature. It is potentially important for further functional analysis and genetic manipulation for molecular breeding to breed new cultivar of lettuce to restrain early bolting, which is vital for improving vegetable quality.
2019-11-12 | PXD008610 | Pride
Project description: Not available
| S-EPMC5778503 | biostudies-literature
Project description:Temperature plays an important role in the growth and development of lettuce (Lactuca sativa L.). A high temperature can induce bolting, which decreases both the quality and production of lettuce. However, knowledge of underlying lettuce bolting is still lacking, especially in the molecular basis that high temperature promotes the premature bolting of lettuce at the phosphorylated level. In this study, we analyzed the lettuce stems during the bolting period induced by a high temperature (33oC/25oC, day/ night) and a controlled temperature (20oC/13oC, day/night) using iTRAQ-based phosphoproteome and 987 phosphoproteins were significantly changed after high-temperature treatment and a total of 3814 phosphorylation sites located in 1766 phosphopeptides were identified. Also, we found 216 phosphoproteins significantly regulated, of which 116 up-regulated and 101 down-regulated, and the abundance changed peptides after high-temperature treatment was significantly involved in the biological process (BP) of water homeostasis. Most of these phosphoproteins were associated with metabolic process, correspondingly the main molecular functions are catalytic activity and transporter activity. The top 10 signaling pathways included spliceosome, starch and sucrose metabolism, RNA transport, protein processing in endoplasmic reticulum, phosphatidylinositol signaling system, phospholipase D signaling pathway, apoptosis, protein export, tight junction, and glycerolipid metabolism. For further, we found the high-temperature influence phosphoprotein activity associated with metabolism, especially, starch and sucrose metabolism, glycerolipid metabolism, methane metabolism. The kinases, including proline-directed, acidic, basic, others and tyrosine, were predicted to be involved in signal transduction and metabolism regulation. The proline-directed motif such as ..SP..[s]P, [s]P, [t]P was the dominant class, proline-directed motifs associated with MAK kinase, and several acidic motifs are casein kinase II motif are necessary for lettuce blotting. Our study showed phosphoproteome profiling in response to high temperature and provides a better understanding of the molecular mechanisms regulated in lettuce blotting
2019-06-10 | PXD014208 | iProX
Project description:The use of new natural eco-sustainable products is becoming an interesting option in order to reduce the use of chemical fertilizers and increase crop yields. Seaweed extracts are gained major attention as plant biostimulants due to their positive effect on plant-growth as well as on improving plants’ tolerance against abiotic stresses. Among the horticulture crops, lettuce (Lactuca sativa L.) is a major fresh vegetable crop in the Mediterranean area, which often requires the use of natural biostimulants to improve both the quantity and quality of production. The aim of this work was to assess the effect of either Chlorella vulgaris or Scenedesmus quadricauda extracts on lettuce seedlings (Lactuca sativa L.) by motoring the induced transcriptomic modifications using a RNASeq approach. The results showed that both C. vulgaris and S. quadricauda extracts positively influence the growth of lettuce seedlings. However, a higher reprogramming of the gene expression occurred in the case of C. vulgaris treatment than in S. quadricauda extract. Considering the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway functional enrichments, the main KEGG terms are in the “Biosynthesis of secondary metabolites”, “Metabolic pathways”, “Carbon metabolism” and “Biosynthesis of amino acids” categories. This study lays the basis for understanding the mechanisms and processes triggered by the use of microalgal extracts, which can represent an easier-to-handle and cheaper method for an eco-sustainable cultivation of lettuce plants than the application of chemicals.
2023-07-13 | GSE227491 | GEO
Project description:Lettuce (Lactuca sativa L.) as one of the most economically important leaf vegetables, is easy bolting in high temperature condition. Early bolting loses its commodity value and edible value and bring huge losses and waste of resources. However, the initiation and molecular mechanism underlying early bolting induced by high temperature remains largely elusive. To better understand it, a comparative proteomics analysis was conducted on lettuce, in the initiation period of bolting induced by a high temperature (33 oC) and a control temperature (20 oC) using iTRAQ-based proteomics, phenotypic measures, and biological verifications using qRT-PCR. The morphologic and microscopic observation showed that the initiation of bolting was on 8 day after high temperature treatment. Fructose rapidly accumulated after high temperature. In the period of the bolting initiation, of the 3305 identified proteins, a total of 93 proteins were identified with differential abundance, among 38 of these proteins were up-regulated and 55 proteins were down-regulated. About 38% of proteins were involved in metabolic pathway and mainly clustered in energy metabolism and protein synthesis. Furthermore, some proteins involved in sugar synthesis were differentially expressed, which were also related with energy production. This is the first report on the metabolic changes involved in bolting initiation in lettuce. Our study suggested that energy metabolism and ribosomal proteins are pivotal components during bolting initiation. It may bring potential regulatory mechanism for the initiation of early bolting by high temperature and manipulations for breeding in lettuce.
2019-07-02 | PXD014464 | iProX
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
2024-02-27 | GSE226302 | GEO
Project description:Circular RNA (circRNA) is a covalently-closed single-stranded RNA molecule that plays an important role in transcriptional regulation of gene expression in a variety of species. Light intensity is a pivotal environmental factor affecting plant growth and development. However, little is known regarding photoresponsive plant circRNAs. Here, we aimed to investigate the expression and function of circRNAs in lettuce leaves in response to different light intensity treatments. We performed RNA sequencing (RNA-Seq) on leaves of lettuce (Lactuca sativa) to determine circRNA expression profiles and reverse-transcription polymerase chain reaction (PCR) to validate the candidate circRNA molecules. We then combined bioinformatics approach to explore the function of the parental genes of circRNA, including network, Gene Ontology, and Kyoto Encyclopedia of Genes and Genomes pathway analysis. We identified 1650 circRNAs in lettuce, of which 1508 (86.40%) were derived from exons. Using real-time PCR, we characterized 10 validated differentially expressed circRNAs and their parental genes, all of which showed expression patterns consistent with RNA-Seq data. Interestingly, the expression of circRNA was, in some cases, inversely correlated with the expression of the parental gene. Furthermore, analysis of the circRNA–microRNA–mRNA network suggests that circRNAs may be involved in plant hormone signaling and chlorophyll metabolism during photoreactivity. These findings provide an essential reference basis for studying circRNAs’ biological mechanisms in light-treated plants.
2020-04-14 | GSE148578 | GEO
Project description:The small RNAs and their targets were characterized in lettuce (Lactuca sativa) genome by deep sequencing the small RNA populations of leaf tissues (cv. Salinas, Cobham and Diana), inoculated with Bremia and mock. The small RNA targets were also validated using PARE/degradome data derived from the same tissues.
2017-04-13 | GSE84280 | GEO
Project description:Lactuca sativa strain:Oilseed lettuce (horticultural type) Transcriptome or Gene expression
| PRJNA262130 | ENA