Biosynthetic considerations could assist the structure elucidation of host plant produced rhizosphere signalling compounds (strigolactones) for arbuscular mycorrhizal fungi and parasitic plants

Rani, Kumkum; Zwanenburg, B.; Sugimoto, Yukihiro; Yoneyama, Koichi; Bouwmeester, Harro J.

doi:10.1016/j.plaphy.2008.04.012

Cited by 85 publications

(64 citation statements)

References 52 publications

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“…It was previously postulated that one or more cytochrome P450 enzymes must be involved in strigolactone biosynthesis (Matusova et al, 2005;Humphrey et al, 2006;Rani et al, 2008). The reduction of orobanchol in max1-1 (Fig.…”

Section: Strigolactones In Max Mutantsmentioning

confidence: 92%

“…S5; Rani et al, 2008). In the biosynthetic scheme proposed by Rani et al (2008), 5-deoxystrigol is the first real strigolactone in the pathway and serves as the common substrate for all known strigolactones, which could be an explanation for the low 5-deoxystrigol concentration. In one branch of the proposed pathway, 5-deoxystrigol is hydroxylated at position 4 to form orobanchol (Supplemental Fig.…”

Section: Detection Of Strigolactones In Arabidopsis Root Exudates Andmentioning

confidence: 99%

“…S5). Acetylation, a common reaction in the strigolactone pathway (Rani et al, 2008), of orobanchol would then yield orobanchyl acetate. In line with this, a reasonable hypothesis is that the activity detected in fraction 17, which shows the typical strigolactone-like pattern (Figs.…”

Section: Detection Of Strigolactones In Arabidopsis Root Exudates Andmentioning

confidence: 99%

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Strigolactones Are Transported through the Xylem and Play a Key Role in Shoot Architectural Response to Phosphate Deficiency in Nonarbuscular Mycorrhizal Host Arabidopsis

et al. 2010

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The biosynthesis of the recently identified novel class of plant hormones, strigolactones, is up-regulated upon phosphate deficiency in many plant species. It is generally accepted that the evolutionary origin of strigolactone up-regulation is their function as a rhizosphere signal that stimulates hyphal branching of arbuscular mycorrhizal fungi. In this work, we demonstrate that this induction is conserved in Arabidopsis (Arabidopsis thaliana), although Arabidopsis is not a host for arbuscular mycorrhizal fungi. We demonstrate that the increase in strigolactone production contributes to the changes in shoot architecture observed in response to phosphate deficiency. Using high-performance liquid chromatography, column chromatography, and multiple reaction monitoring-liquid chromatography-tandem mass spectrometry analysis, we identified two strigolactones (orobanchol and orobanchyl acetate) in Arabidopsis and have evidence of the presence of a third (5-deoxystrigol). We show that at least one of them (orobanchol) is strongly reduced in the putative strigolactone biosynthetic mutants more axillary growth1 (max1) and max4 but not in the signal transduction mutant max2. Orobanchol was also detected in xylem sap and up-regulated under phosphate deficiency, which is consistent with the idea that root-derived strigolactones are transported to the shoot, where they regulate branching. Moreover, two additional putative strigolactone-like compounds were detected in xylem sap, one of which was not detected in root exudates. Together, these results show that xylem-transported strigolactones contribute to the regulation of shoot architectural response to phosphate-limiting conditions.

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Section: Strigolactones In Max Mutantsmentioning

confidence: 92%

Section: Detection Of Strigolactones In Arabidopsis Root Exudates Andmentioning

confidence: 99%

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Strigolactones Are Transported through the Xylem and Play a Key Role in Shoot Architectural Response to Phosphate Deficiency in Nonarbuscular Mycorrhizal Host Arabidopsis

et al. 2010

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“…Indeed, strigolactone application of GR24 can restore wild-type branching phenotype in pea ccd8 mutants and also in the orthologous ccd8 Arabidopsis, in a dose-dependent manner (Gomez-Roldan et al 2008). Beta-carotene has been proposed as the substrate for strigolactone biosynthesis (Matusova et al 2005;Rani et al 2008) and it has yet to be determined if changes in b-carotene levels perturb strigolactone production.…”

Section: Photosynthesis and Photoprotection In Plantsmentioning

confidence: 99%

Carotenoids in nature: insights from plants and beyond

Cazzonelli

2011

Functional Plant Biol.

444

245

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Abstract. Carotenoids are natural isoprenoid pigments that provide leaves, fruits, vegetables and flowers with distinctive yellow, orange and some reddish colours as well as several aromas in plants. Their bright colours serve as attractants for pollination and seed dispersal. Carotenoids comprise a large family of C 40 polyenes and are synthesised by all photosynthetic organisms, aphids, some bacteria and fungi alike. In animals carotenoid derivatives promote health, improve sexual behaviour and are essential for reproduction. As such, carotenoids are commercially important in agriculture, food, health and the cosmetic industries. In plants, carotenoids are essential components required for photosynthesis, photoprotection and the production of carotenoid-derived phytohormones, including ABA and strigolactone. The carotenoid biosynthetic pathway has been extensively studied in a range of organisms providing an almost complete pathway for carotenogenesis. A new wave in carotenoid biology has revealed implications for epigenetic and metabolic feedback control of carotenogenesis. Developmental and environmental signals can regulate carotenoid gene expression thereby affecting carotenoid accumulation. This review highlights mechanisms controlling (1) the first committed step in phytoene biosynthesis, (2) flux through the branch to synthesis of a-and b-carotenes and (3) metabolic feedback signalling within and between the carotenoid, MEP and ABA pathways.

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“…In addition, we have postulated how, after carotenoid cleavage, further enzymatic conversions likely lead to the production of all the strigolactones known to date. 8,9 However, so far the enzymes involved in strigolactone biosynthesis and their regulation remain unknown.…”

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confidence: 99%