Dodecyl α‐<scp>L</scp>‐Rhamnopyranosyl‐(1→2)‐β‐<scp>D</scp>‐fucopyranoside Derivatives from the Glandular Trichome Exudate of Erodium pelargoniflorum

Sakai, Takaomi; Tanemura, Yuhei; Itoh, Seiga; Fujimoto, Yoshinori

doi:10.1002/cbdv.201200366

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…Acylsugars are secreted by glandular trichomes of several plant families, including Martyniaceae ( Asai et al, 2010 ), Caryophyllaceae ( Asai et al, 2012 ), Geraniaceae ( Sakai et al, 2013 ), and Solanaceae, where they have been best studied. A detailed knowledge about genes involved in regulating acylsugar amount and acyl chain profile ( Ben-Mahmoud et al, 2018 ) is required for successful crop breeding programs and metabolic engineering of acylsugar production.…”

Section: Discussionmentioning

confidence: 99%

Specialized metabolism by trichome-enriched Rubisco and fatty acid synthase components

Mandal

Rezenom

et al. 2022

Plant Physiology

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Acylsugars, specialized metabolites with defense activities, are secreted by trichomes of many solanaceous plants. Several acylsugar metabolic genes (AMGs) remain unknown. We previously reported multiple candidate AMGs. Here, using multiple approaches, we characterized additional AMGs. First, we identified differentially expressed genes between high- and low-acylsugar-producing F2 plants derived from a cross between cultivated tomato (Solanum lycopersicum) and a wild relative (S. pennellii), which produce acylsugars that are ∼1% and ∼20% of leaf dry weight, respectively. Expression levels of many known and candidate AMGs positively correlated with acylsugar amounts in F2 individuals. Next, we identified lycopersicum-pennellii putative orthologs with higher nonsynonymous to synonymous substitutions. These analyses identified four candidate genes, three of which showed enriched expression in stem trichomes compared to underlying tissues (shaved stems). Virus-induced gene silencing confirmed two candidates, Sopen05g009610 [beta-ketoacyl-(acyl-carrier-protein) reductase; fatty acid synthase component] and Sopen07g006810 (Rubisco small subunit), as AMGs. Phylogenetic analysis indicated that Sopen05g009610 is distinct from specialized metabolic cytosolic reductases but closely related to two capsaicinoid biosynthetic reductases, suggesting evolutionary relationship between acylsugar and capsaicinoid biosynthesis. Analysis of publicly available datasets revealed enriched expression of Sopen05g009610 orthologs in trichomes of several acylsugar-producing species. Similarly, orthologs of Sopen07g006810 were identified as solanaceous trichome-enriched members, which form a phylogenetic clade distinct from those of mesophyll-expressed “regular” Rubisco small subunits. Furthermore, δ13C analyses indicated recycling of metabolic CO2 into acylsugars by Sopen07g006810 and showed how trichomes support high levels of specialized metabolite production. These findings have implications for genetic manipulation of trichome specialized metabolism in solanaceous crops.

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Section: Discussionmentioning

confidence: 99%

Specialized metabolism by trichome-enriched Rubisco and fatty acid synthase components

Mandal

Rezenom

et al. 2022

Plant Physiology

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Specialized metabolism by trichome-preferentially-expressed Rubisco and fatty acid synthase components

Mandal

Rezenom

et al. 2022

Preprint

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Acylsugars, specialized metabolites with defense activities, are secreted by trichomes of many solanaceous plants. Several acylsugar metabolic genes (AMGs) remain unknown. We previously reported multiple candidate AMGs. Here, using multiple approaches, we characterized additional AMGs. First, we identified differentially expressed genes between high- and low-acylsugar-producing F2 plants derived from a cross between Solanum lycopersicum and S. pennellii, which produce acylsugars ~1% and ~20% of leaf dry weight, respectively. Expression levels of many known and candidate AMGs positively correlated with acylsugar amounts in F2 individuals. Next, we identified lycopersicum-pennellii putative orthologs with higher nonsynonymous to synonymous substitutions. These analyses identified four candidate genes, three of which showed enriched expression in stem trichomes compared to underlying tissues (shaved stems). Virus-induced gene silencing confirmed two candidates, Sopen05g009610 [beta-ketoacyl-(acyl-carrier-protein) reductase; fatty acid synthase component] and Sopen07g006810 (Rubisco small subunit), as AMGs. Phylogenetic analysis indicated that Sopen05g009610 is distinct from specialized metabolic cytosolic reductases, but closely related to two capsaicinoid biosynthetic reductases, suggesting evolutionary relationship between acylsugar and capsaicinoid biosynthesis. Additionally, data mining revealed that orthologs of Sopen05g009610 are preferentially expressed in trichomes of several acylsugar-producing solanaceous species. Similarly, orthologs of Sopen07g006810 were identified as trichome-preferentially-expressed members, which form a phylogenetic clade distinct from those of mesophyll-expressed "regular" Rubisco small subunits. Furthermore, ?13C analyses indicated recycling of metabolic CO2 into acylsugars by Sopen07g006810 and shed light on how trichomes support high levels of specialized metabolite production. These findings have implications for genetic manipulation of trichome specialized metabolism in solanaceous crops, including tomato, potato, and tobacco.

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Dodecyl α‐L‐Rhamnopyranosyl‐(1→2)‐β‐D‐fucopyranoside Derivatives from the Glandular Trichome Exudate of Erodium pelargoniflorum

Cited by 2 publications

References 18 publications

Specialized metabolism by trichome-enriched Rubisco and fatty acid synthase components

Specialized metabolism by trichome-enriched Rubisco and fatty acid synthase components

Specialized metabolism by trichome-preferentially-expressed Rubisco and fatty acid synthase components

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