Synthesis and Function of Apocarotenoid Signals in Plants

Hou, Xin; Rivers, John; León, Patricia; McQuinn, Ryan P.; Pogson, Barry J.

doi:10.1016/j.tplants.2016.06.001

Cited by 255 publications

(201 citation statements)

References 104 publications

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“…In line with this finding, TDd 3109 also showed increased phytoene and phytofluene content, as seen in ζ-carotene accumulating tomatoes, following virus-induced gene silencing of Z-ISO (Fantini, Falcone, Frusciante, Giliberto, & Giuliano, 2013). Consequently, TDd 3109 is a potential breeding resource for redirecting precursor biosynthesis, such as to generate lines with enhanced antioxidant activity or for the manipulation of tuber dormancy, since subsequent carotenoids act as precursors to many signalling molecules (Hou et al, 2016;Walter & Strack, 2011).…”

Section: Species-specific Carotenoid Profilessupporting

confidence: 56%

“…Understanding carotenoid biosynthesis is vital to understand plant development, due to their essential role in photosynthesis and as precursors of various signalling molecules and hormones (Hou, Rivers, León, McQuinn, & Pogson, 2016), such as abscisic acid (ABA), strigolactones and apocarotenoids, which regulate many cellular processes, including fruit ripening, environmental interactions and especially may be important for yam tuber dormancy, which is less understood and contrasts with the model tuberous crops, such as potato and cassava.…”

Section: Introductionmentioning

confidence: 99%

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Carotenoid profiling of yams: Clarity, comparisons and diversity

et al. 2018

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A B S T R A C TScreening carotenoids of elite accessions of yam (Dioscorea spp.) used in the global yam breeding program has been conducted to quantitatively determine the carotenoid composition of the crop. Comparisons to previous data reporting cerotenoid levels in yam has been made, in order to deduce greater perspectives across multiple studies. Characterisation of complex species and accession -specific profiles have shown a rich base of diversity that can inform breeding strategies. Key findings include; (i) the identification of accessions rich in β-carotene which can aid provitamin A biofortification, (ii) Data disputing the commonly held belief that yellow Guinea yam (D. cayennensis) has higher β-carotene content than that of white Guinea yam (D. rotundata), and (iii) the tentative identification of C 25 -epoxy-apocarotenoid persicaxanthin with potential implications for tuber dormancy.

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Section: Species-specific Carotenoid Profilessupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Carotenoid profiling of yams: Clarity, comparisons and diversity

et al. 2018

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“…blumenol) glucosides as well as yellow linear C 14 mycorradicines have been associated with the establishment of mycorrhiza in roots (Floss et al, 2008;Schliemann et al, 2008) and are suggested to play a role in arbuscule turnover (Walter et al, 2010). Both ABA and blumenol are derived from all-trans-lycopene (for review, see Hou et al, 2016). The strong reduction of the dihydroxy blumenol glucoside in mycorrhized leaves could be due to either competing biosynthesis with ABA (Fig.…”

Section: Am Symbiosis Regulates Flavonoid/anthocyanin and Terpenoid Bmentioning

confidence: 99%

Enhanced Secondary- and Hormone Metabolism in Leaves of Arbuscular Mycorrhizal Medicago truncatula

et al. 2017

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Arbuscular mycorrhizas (AM) are the most common symbiotic associations between a plant's root compartment and fungi. They provide nutritional benefit (mostly inorganic phosphate [P i ]), leading to improved growth, and nonnutritional benefits, including defense responses to environmental cues throughout the host plant, which, in return, delivers carbohydrates to the symbiont. However, how transcriptional and metabolic changes occurring in leaves of AM plants differ from those induced by P i fertilization is poorly understood. We investigated systemic changes in the leaves of mycorrhized Medicago truncatula in conditions with no improved P i status and compared them with those induced by high-P i treatment in nonmycorrhized plants. Microarray-based genome-wide profiling indicated up-regulation by mycorrhization of genes involved in flavonoid, terpenoid, jasmonic acid (JA), and abscisic acid (ABA) biosynthesis as well as enhanced expression of MYC2, the master regulator of JA-dependent responses. Accordingly, total anthocyanins and flavonoids increased, and most flavonoid species were enriched in AM leaves. Both the AM and P i treatments corepressed iron homeostasis genes, resulting in lower levels of available iron in leaves. In addition, higher levels of cytokinins were found in leaves of AM-and P i -treated plants, whereas the level of ABA was increased specifically in AM leaves. Foliar treatment of nonmycorrhized plants with either ABA or JA induced the up-regulation of MYC2, but only JA also induced the up-regulation of flavonoid and terpenoid biosynthetic genes. Based on these results, we propose that mycorrhization and P i fertilization share cytokinin-mediated improved shoot growth, whereas enhanced ABA biosynthesis and JA-regulated flavonoid and terpenoid biosynthesis in leaves are specific to mycorrhization.

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“…Carotenoids per se are too lipophilic to be transported out of the plastid. However, short-chained apocarotenoids formed through carotenoid cleavage by nonenzymatic as well as enzymatic processes, and derivatives thereof are more water-soluble and have been shown to act as signaling metabolites, capable of relaying plastidderived information into other compartments, to bind to receptors and induce downstream events (Tian, 2015;Hou et al, 2016). Prominent examples are ABA and strigolactones, involved in stress response and shootbranching control, respectively, the signaling pathways of which are well understood.…”

Section: Flux-dependent Translational Control Of Psy Mediated By the mentioning

confidence: 99%

Carotenogenesis Is Regulated by 5′UTR-Mediated Translation of Phytoene Synthase Splice Variants

et al. 2016

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Phytoene synthase (PSY) catalyzes the highly regulated, frequently rate-limiting synthesis of the first biosynthetically formed carotene. While PSY constitutes a small gene family in most plant taxa, the Brassicaceae, including Arabidopsis (Arabidopsis thaliana), predominantly possess a single PSY gene. This monogenic situation is compensated by the differential expression of two alternative splice variants (ASV), which differ in length and in the exon/intron retention of their 59UTRs. ASV1 contains a long 59UTR (untranslated region) and is involved in developmentally regulated carotenoid formation, such as during deetiolation. ASV2 contains a short 59UTR and is preferentially induced when an immediate increase in the carotenoid pathway flux is required, such as under salt stress or upon sudden light intensity changes. We show that the long 59UTR of ASV1 is capable of attenuating the translational activity in response to high carotenoid pathway fluxes. This function resides in a defined 59UTR stretch with two predicted interconvertible RNA conformations, as known from riboswitches, which might act as a flux sensor. The translation-inhibitory structure is absent from the short 59UTR of ASV2 allowing to bypass translational inhibition under conditions requiring rapidly increased pathway fluxes. The mechanism is not found in the rice (Oryza sativa) PSY1 59UTR, consistent with the prevalence of transcriptional control mechanisms in taxa with multiple PSY genes. The translational control mechanism identified is interpreted in terms of flux adjustments needed in response to retrograde signals stemming from intermediates of the plastid-localized carotenoid biosynthesis pathway.

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Synthesis and Function of Apocarotenoid Signals in Plants

Cited by 255 publications

References 104 publications

Carotenoid profiling of yams: Clarity, comparisons and diversity

Carotenoid profiling of yams: Clarity, comparisons and diversity

Enhanced Secondary- and Hormone Metabolism in Leaves of Arbuscular Mycorrhizal Medicago truncatula

Carotenogenesis Is Regulated by 5′UTR-Mediated Translation of Phytoene Synthase Splice Variants

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