Local light signalling at the leaf tip drives remote differential petiole growth through auxin-gibberellin dynamics

Küpers, Jesse J; Snoek, L. Basten; Oskam, Lisa; Pantazopoulou, Chrysoula K; Matton, Sanne E.A.; Reinen, Emilie; Liao, Che‐Yang; Eggermont, Eline; Weekamp, Harold; Kohlen, Wouter; Weijers, Dolf; Pierik, R.L.M.

doi:10.1101/2022.02.25.481815

Cited by 3 publications

(1 citation statement)

References 56 publications

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“…Auxins are then transported towards the petiole, where they are locally redistributed to the abaxial side. Next, auxin signaling in the lower side of the petiole stimulates local gibberellic acid (GA) biosynthesis, initiating abaxial cell elongation, and hence petiole hyponasty (Küpers et al, 2022). Concomitantly, abscisic acid (ABA) signaling stimulates hyponasty, potentially through the interaction with sugar signaling (Michaud et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Waterlogging shifts ontogenic hormone dynamics in tomato leaves and petioles

Geldhof

Novák

Poel

2022

Preprint

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Waterlogging leads to hypoxic conditions in the root zone that subsequently cause systemic adaptive responses in the shoot, including leaf epinasty. Waterlogging-induced epinasty in tomato has long been ascribed to the coordinated action of ethylene and auxins. However, other hormonal signals have largely been neglected, despite evidence of their importance in leaf posture control. To adequately cover a large group of growth regulators, we performed a tissue-specific and time-dependent hormonomics analysis. This analysis revealed that multiple hormones are differentially affected throughout a 48 h waterlogging treatment, and, more importantly, that leaf development defines a framework in which this hormonal control is regulated. In addition, we could distinguish early hormonal signals that might contribute to fast responses towards oxygen deprivation from those that potentially sustain the waterlogging response. For example, abscisic acid (ABA) levels peak in petioles within the first 12 h of the treatment, while its metabolites only rise much later, suggesting ABA transport is altered. At the same time, cytokinins (CK) and their derivatives drastically decline during waterlogging in leaves of all ages. This drop in CK possibly releases the inhibition of ethylene and auxin mediated cell elongation to establish epinastic bending. Auxins themselves rise substantially in the petiole of mature leaves, but mostly after 48 h of root hypoxia. Based on our hormone profiling, we propose that ethylene and ABA might act synergistically to dynamically fine-tune the balance of IAA and CK in the petiole, ultimately leading to differential growth and epinasty during waterlogging.

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Section: Introductionmentioning

confidence: 99%

Waterlogging shifts ontogenic hormone dynamics in tomato leaves and petioles

Geldhof

Novák

Poel

2022

Preprint

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Long noncoding RNA-mediated epigenetic regulation of auxin-related genes controlling shade avoidance syndrome inArabidopsis thaliana

Mammarella

Lucero

Hussain

et al. 2023

Preprint

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The long noncoding RNA (lncRNA) AUXIN-REGULATED PROMOTER LOOP (APOLO) recognizes a subset of target loci across the Arabidopsis thaliana genome by forming RNA-DNA hybrids (R-loop) and modulating local three-dimensional chromatin conformation. Here we show that APOLO is involved in regulating the shade avoidance syndrome (SAS) by dynamically modulating the expression of key factors. In response to far-red (FR) light, the expression of APOLO anticorrelates with its target BRANCHED1 (BRC1), a master regulator of shoot branching in Arabidopsis thaliana. APOLO deregulation results in BRC1 transcriptional repression and an increase in the number of branches. APOLO transcriptional accumulation fine-tunes the formation of a repressive chromatin loop encompassing the BRC1 promoter, which normally occurs only in leaves as well as in a late response to FR treatment in axillary buds. In addition, our data reveal that APOLO participates in leaf hyponasty, in agreement with its previously reported role in the control of auxin homeostasis through direct modulation of YUCCA2 (auxin synthesis), PID and WAG2 (auxin efflux).

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Root branching in salt requires auxin-independent modulation of LBD16 function

Zhang

Zeeuw

et al. 2023

Preprint

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Salinity stress constrains lateral root (LR) growth and severely impacts plant growth. Auxin signaling is indispensable for the regulation of LR formation. Nevertheless, the molecular mechanism of how salinity affects root auxin signaling and whether salt would steer alternative pathway(s) to regulate LR development is unknown. Here we show that the auxin-regulated transcription factor LATERAL ORGAN BOUNDARY DOMAIN (LBD) 16, known as an essential player for LR development under control conditions, is regulated by an alternative non-canonical pathway under salinity. Salt represses auxin signaling but in parallel activates an upstream transcriptional activator of LBD16, ZINC FINGER OF ARABIDOPSIS THALIANA 6 (ZAT6). ZAT6 modulates the activity of LBD16 to contribute to downstream cell wall remodeling, and promotes LR development under salinity stress. Our study thus shows that root developmental plasticity in response to salt stress is achieved by integration of auxin-dependent repressive and salt-activated auxin-independent pathways converging on LBD16 to modulate root branching modulation under salinity.

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Local light signalling at the leaf tip drives remote differential petiole growth through auxin-gibberellin dynamics

Cited by 3 publications

References 56 publications

Waterlogging shifts ontogenic hormone dynamics in tomato leaves and petioles

Waterlogging shifts ontogenic hormone dynamics in tomato leaves and petioles

Long noncoding RNA-mediated epigenetic regulation of auxin-related genes controlling shade avoidance syndrome inArabidopsis thaliana

Root branching in salt requires auxin-independent modulation of LBD16 function

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