Callose accumulation in specific phloem cell types reduces axillary bud growth in <i>Arabidopsis thaliana</i>

Paterlini, Andrea; Dorussen, Delfi; Fichtner, Franziska; Rongen, Martin van; Delacruz, Ruth; Vojnovic, Ana; Helariutta, Yrjö; Leyser, Ottoline

doi:10.1111/nph.17398

Cited by 9 publications

(10 citation statements)

References 60 publications

(75 reference statements)

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“…This signal has been assigned to sucrose and trehalose-6-phosphate (T6P), whose levels increase rapidly after decapitation (Fichtner et al, 2017(Fichtner et al, , 2021Barbier et al, 2019). In agreement with such a scenario, elegant recent work with cell-specific genetic manipulation of phloem transport (Paterlini et al, 2021) and sugar supply (Fichtner et al, 2021) indicated that sugars may indeed contribute to axillary bud activation in Arabidopsis. Since BRC1 expression is repressed by sugars (Mason et al, 2014;Barbier et al, 2015;Otori et al, 2019;Patil et al, 2022), a plausible model is that sugars contribute to bud outgrowth by attenuating BRC1-dependent dormancy (Wang et al, 2019).…”

Section: How Are Buds Triggered To Grow Out When They Are Released Fr...mentioning

confidence: 82%

“…Hence, decapitation could potentially lead to bushy shoot phenotypes as in mutants with decreased AD ( max , dad , rms, and dwarf ). However, this is normally not the case, because the remaining buds are in mutual competition ( Crawford et al, 2010 ; Shinohara et al, 2013 ; Balla et al, 2016 ; Paterlini et al, 2021 ), and often, one bud rapidly outcompetes all the others. Therefore, soon after decapitation, AD is reestablished resulting in a single new main shoot.…”

Section: Competition Among Buds Kicks In Via Auxin...mentioning

confidence: 99%

“…Therefore, soon after decapitation, AD is reestablished resulting in a single new main shoot. It is plausible that this phenomenon is due to the rapid re-activation of correlative inhibition among the buds as a result of dominating auxin canalization in the new main shoot ( Crawford et al, 2010 ; Shinohara et al, 2013 ; Balla et al, 2016 ; Paterlini et al, 2021 ). Hence, the SL-modulated auxin-based competition mechanism in AD is not only required to maintain axillary meristems in a silent state during normal development but also to quickly re-establish branching hierarchy after a disturbance ( Domagalska and Leyser, 2011 ).…”

Section: Competition Among Buds Kicks In Via Auxin...mentioning

confidence: 99%

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How Strigolactone Shapes Shoot Architecture

2022

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Despite its central role in the control of plant architecture, strigolactone has been recognized as a phytohormone only 15 years ago. Together with auxin, it regulates shoot branching in response to genetically encoded programs, as well as environmental cues. A central determinant of shoot architecture is apical dominance, i.e., the tendency of the main shoot apex to inhibit the outgrowth of axillary buds. Hence, the execution of apical dominance requires long-distance communication between the shoot apex and all axillary meristems. While the role of strigolactone and auxin in apical dominance appears to be conserved among flowering plants, the mechanisms involved in bud activation may be more divergent, and include not only hormonal pathways but also sugar signaling. Here, we discuss how spatial aspects of SL biosynthesis, transport, and sensing may relate to apical dominance, and we consider the mechanisms acting locally in axillary buds during dormancy and bud activation.

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Section: How Are Buds Triggered To Grow Out When They Are Released Fr...mentioning

confidence: 82%

Section: Competition Among Buds Kicks In Via Auxin...mentioning

confidence: 99%

Section: Competition Among Buds Kicks In Via Auxin...mentioning

confidence: 99%

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How Strigolactone Shapes Shoot Architecture

2022

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“…In perennial plants, bud dormancy is induced in response to short days by callose deposition in plasmodesmata, which restricts symplastic cellcell signaling and metabolite flux in the shoot apical meristem (van der Schoot & Rinne, 2011). In a recent study, Paterlini et al (2021) investigated if an increase in callose synthesis would inhibit axillary bud outgrowth in Arabidopsis. Using the iclas3 system, the authors increased callose biosynthesis in Arabidopsis companion cells and phloem parenchyma cells, and investigated the effect on axillary bud growth in intact and decapitated excised inflorescence stem sections containing one or two axillary buds.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

“…In perennial plants, bud dormancy is induced in response to short days by callose deposition in plasmodesmata, which restricts symplastic cell-cell signaling and metabolite flux in the shoot apical meristem ( van der Schoot & Rinne, 2011 ). In a recent study, Paterlini et al. (2021) investigated if an increase in callose synthesis would inhibit axillary bud outgrowth in Arabidopsis.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Activation of apoplastic sugar at the transition stage may be essential for axillary bud outgrowth in the grasses

Kebrom

Doust²

2022

Front. Plant Sci.

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Shoot branches develop from buds in leaf axils. Once formed from axillary meristems, the buds enter a transition stage before growing into branches. The buds may transition into dormancy if internal and environmental factors limit sucrose supply to the buds. A fundamental question is why sucrose can be limiting at the transition stage for bud outgrowth, whereas new buds continue to be formed. Sucrose is transported to sink tissues through symplastic or apoplastic pathways and a shift from symplastic to apoplastic pathway is common during seed and fruit development. In addition, symplastic connected tissues are stronger sinks than symplastically isolated tissues that rely on sugars effluxed to the apoplast. Recent studies in sorghum, sugarcane, and maize indicate activation of apoplastic sugar in buds that transition to outgrowth but not to dormancy, although the mode of sugar transport during bud formation is still unclear. Since the apoplastic pathway in sorghum buds was specifically activated during bud outgrowth, we posit that sugar for axillary bud formation is most likely supplied through the symplastic pathway. This suggests a key developmental change at the transition stage, which alters the sugar transport pathway of newly-formed buds from symplastic to apoplastic, making the buds a less strong sink for sugars. We suggest therefore that bud outgrowth that relies on overflow of excess sucrose to the apoplast will be more sensitive to internal and environmental factors that enhance the growth of sink tissues and sucrose demand in the parent shoot; whereas bud formation that relies on symplastic sucrose will be less affected by these factors.

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Xylem development and phloem conductivity in relation to the stem mechanical strength of Paeonia lactiflora

Yang

Huang

Ren

et al. 2023

Journal of Plant Physiology

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Callose accumulation in specific phloem cell types reduces axillary bud growth in Arabidopsis thaliana

Abstract: Callose accumulation in specific phloem cell types reduces axillary bud growth in Arabidopsis thaliana

Cited by 9 publications

References 60 publications

How Strigolactone Shapes Shoot Architecture

How Strigolactone Shapes Shoot Architecture

Activation of apoplastic sugar at the transition stage may be essential for axillary bud outgrowth in the grasses

Xylem development and phloem conductivity in relation to the stem mechanical strength of Paeonia lactiflora

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