Oligo-carrageenan kappa increases glucose, trehalose and TOR-P and subsequently stimulates the expression of genes involved in photosynthesis, and basal and secondary metabolisms in Eucalyptus globulus

Abstract

Background It has been previously shown that oligo-carrageenan (OC) kappa increases growth, photosynthesis and activities of enzymes involved in basal and secondary metabolisms in Eucalyptus globulus. However, it is not known whether OC kappa may induce the activation of TOR pathway and the increase in expression of genes encoding proteins involved in photosynthesis and enzymes of basal and secondary metabolisms. Results E. globulus trees were sprayed on leaves with water (control) or with OC kappa 1 mg mL − 1 , once a week, four times in total, and cultivated for 17 additional weeks (21 weeks in total). Treated trees showed a higher level of net photosynthesis than controls, beginning at week 3, a higher height, beginning at week 9, and those differences remained until week 21. In addition, treated trees showed an increase in the level of glucose beginning at week 1, trehalose at weeks 1–3, and in TOR-P level at week 1–2. On the other hand, transcripts encoding proteins involved in photosynthesis, and enzymes involved in glucose accumulation, C, N and S assimilation, and synthesis of secondary metabolites began at weeks 3–4 and with additional peaks at weeks 5–6, 8–11,13–14 and 17–19. Thus, OC kappa induced initial increases in glucose, trehalose and TOR-P levels that were followed by oscillatory increases in the level of transcripts coding for proteins involved in photosynthesis, and in basal and secondary metabolisms suggesting that initial increases in glucose, trehalose and TOR-P may trigger activation of gene expression. Conclusions The stimulation of growth induced by OC kappa in E. globulus trees is due, at least in part, to activation of TOR pathway and the increase in expression of genes encoding proteins involved in photosynthesis and enzymes of basal metabolism. Electronic supplementary material The online version of this article (10.1186/s12870-019-1858-z) contains supplementary material, which is available to authorized users.

Evaluation of Carrageenan, Xanthan Gum and Depolymerized Chitosan Based Coatings for Pineapple Lily Plant Production

“…In consequence, plants grow faster and stronger and produce better yield. Carrageenan may act as an elicitor that induces plant defense response against viroids, viruses, bacteria, or fungi, and it also may improve plant growth by controlling numerous metabolic processes including photosynthesis and assimilation of nitrogen and sulfur [10,30,35]. Xanthan gum is also capable of inducing local and systemic resistance against diseases and shows the same efficiency in plant protection against some phytopathogens as fungicides [38,57].…”

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DcPAR1 is Required for Development and Carotenoid Synthesis in the Dark-Grown Carrot Taproot

“…The Arabidopsis protein extraction was performed according to Saucedo et al (2019) with modifications. Briefly, 400 mg of fresh tissue of entire 2-weeks-old Arabidopsis plants were pulverized with liquid nitrogen and then 4 ml of extraction buffer [0.5 M TrisHCl pH8, 0.7 M Sucrose, 2 protease inhibitor tablets (complete Mini, EDTA-free-Thermo Scientific Lot # UG27666820), 50 mM EDTA, KCl 0.1 M, β-mercaptoethanol 0.2%)] were added and homogenized until the sample was completely thawed.…”