Dataset Information

Comprehensive protein profiling of tomato phloem exudates during drought stress and recovery

ABSTRACT: Phloem is the primary conduit through which photosynthates, hormones, and other biologically important molecules are distributed from aerial plant organs downward and throughout the plant. Increasing evidence suggests that phloem contents are diverse and play a critical role in biotic and abiotic stress adaptation. Drought causes the greatest decreases in agricultural crop productivity among all biotic and abiotic stresses, and the link between water deficiency and phloem protein contents is relatively unexplored. Here we employed the EDTA-facilitated phloem exudate collection method from Solanum lycopersicum leaves during a period of drought stress and recovery. Our analysis resulted in the confident identification and quantification of 2,558 proteins. Comparing our data with previous findings confirms that our exudate collection strategy enriched for known phloem proteins. Independent of drought, enrichment analysis of the total phloem exudate protein profiles from all samples suggest that the exchange of proteins into the phloem is more complex than previously thought, including additional protein chaperone systems, branched-chain amino acid synthesis proteins, trehalose metabolism, and RNA silencing proteins. During the experiment we observed 169 proteins whose abundance changed significantly within the phloem sap, the majority of which were impacted specifically in response to drought. Among these were proteins involved in lipid metabolism, chaperone-mediated protein folding, carboxylic acid metabolism, abscisic acid signaling, cytokinin biosynthesis, and amino acid metabolism are significantly upregulated during drought. Conversely, proteins involved in lipid signaling, sphingolipid metabolism, cell wall organization, carbohydrate metabolism, and a mitogen-activated protein kinase are downregulated in response to drought. Many of these observations are consistent with previous literature findings at the whole plant level but have not been localized to the vasculature in tomato, suggesting phloem plays a critical role in adaptation to drought stress in tomato .

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Solanum Lycopersicum

TISSUE(S): Plant Cell, Phloem

SUBMITTER: Aaron Ogden

LAB HEAD: Josh Adkins

PROVIDER: PXD018993 | Pride | 2020-06-26

REPOSITORIES: Pride

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Publications

Phloem Exudate Protein Profiles during Drought and Recovery Reveal Abiotic Stress Responses in Tomato Vasculature.

Ogden Aaron J AJ Bhatt Jishnu J JJ Brewer Heather M HM Kintigh Jack J Kariuki Samwel M SM Rudrabhatla Sairam S Adkins Joshua N JN Curtis Wayne R WR

International journal of molecular sciences 20200623 12

Drought is the leading cause of agricultural yield loss among all abiotic stresses, and the link between water deficit and phloem protein contents is relatively unexplored. Here we collected phloem exudates from <i>Solanum lycopersicum</i> leaves during periods of drought stress and recovery. Our analysis identified 2558 proteins, the most abundant of which were previously localized to the phloem. Independent of drought, enrichment analysis of the total phloem exudate protein profiles from all s ...[more]

PMID: 32586033

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Dataset Information

Comprehensive protein profiling of tomato phloem exudates during drought stress and recovery

Publications

Phloem Exudate Protein Profiles during Drought and Recovery Reveal Abiotic Stress Responses in Tomato Vasculature.

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