The expression of the <i>Athb-8</i> homeobox gene is restricted to provascular cells in <i>Arabidopsis thaliana</i>

Baima, Simona; Nobili, Fabio; Sessa, Giovanna; Lucchetti, Sabrina; Ruberti, Ida; Morelli, Giorgio

doi:10.1242/dev.121.12.4171

Cited by 341 publications

(45 citation statements)

References 41 publications

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“…Enhancing auxin response at the graft junction likely enhanced graft healing through the known roles of auxin in promoting xylem differentiation and activating cambium in part via DOF6 ( ) ( Baima et al, 1995 ; Miyashima et al, 2019 ; Ursache et al, 2014 ), processes that were likely perturbed in the auxin-resistant bdl-2 scion ( Hayward et al, 2009 ). However, bdl-2 rootstocks inhibited grafting regardless of temperature, indicating that the rootstock had a different requirement for auxin response and appeared more sensitive to auxin perturbations.…”

Section: Resultsmentioning

confidence: 99%

High temperature perception in leaves promotes vascular regeneration and graft formation in distant tissues

et al. 2022

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Cellular regeneration in response to wounding is fundamental to maintain tissue integrity. Various internal factors including hormones and transcription factors mediate healing but little is known about the role of external factors. To understand how the environment affects regeneration, we investigated the effects of temperature upon the horticulturally relevant process of plant grafting. We found that elevated temperatures accelerated vascular regeneration in Arabidopsis thaliana and tomato grafts. Leaves were critical for this effect since blocking auxin transport or mutating PHYTOCHROME INTERACTING FACTOR4 (PIF4) or YUCCA2/5/8/9 in the cotyledons abolished the temperature enhancement. However, these perturbations did not affect grafting at ambient temperatures and temperature enhancement of callus formation and tissue adhesion did not require PIF4, suggesting leaf-derived auxin specifically enhanced vascular regeneration in response to elevated temperatures. We also found that elevated temperatures accelerated the formation of inter-plant vascular connections between the parasitic plant Phtheirospermum japonicum and host Arabidopsis, and this effect required shoot-derived auxin from the parasite. Taken together, our results identify a pathway whereby local temperature perception mediates long distance auxin signaling to modify regeneration, grafting and parasitism.

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Section: Resultsmentioning

confidence: 99%

High temperature perception in leaves promotes vascular regeneration and graft formation in distant tissues

et al. 2022

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“…S4; Table S5). The ARABIDOPSIS THALIANA HOMEOBOX GENE 8 ( ATHB8 ) gene is expressed in pre-procambial cells that will differentiate into veins (Baima et al ., 1995). To determine the stage at which api7-1 leaf venation pattern formation diverged from that of L er , we crossed api7-1 plants to an ATHB8 pro :GUS line, and studied the expression of the transgene in cleared first-node rosette leaf primordia of api7-1 ATHB8 pro :GUS plants.…”

Section: Resultsmentioning

confidence: 99%

“…The NASC also provided seeds of the api7-2 (GABI_509C06; N448798) (Kleinboelting et al .,2012) and PIN1 pro :PIN1:GFP DR5 pro :3XVENUS:N7 (N67931) (Heisler et al ., 2005) lines. The ATHB8 pro :GUS line (N296) was kindly provided by Simona Baima (Baima et al ., 1995). The api7-1 line was isolated in the L er background after ethyl methanesulfonate (EMS) mutagenesis in our laboratory, and then backcrossed twice to L er (Berná et al ., 1999).…”

Section: Methodsmentioning

confidence: 99%

The Arabidopsis ATP-Binding Cassette E protein ABCE2 is a conserved component of the translation machinery

Navarro-Quiles

Mateo-Bonmatí

Candela

et al. 2022

Preprint

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ATP-Binding Cassette E (ABCE) proteins dissociate cytoplasmic ribosomes after translation terminates, and contribute to ribosome recycling, thus linking translation termination to initiation. This function has been demonstrated to be essential in animals, fungi, and archaea, but remains unexplored in plants. In most species, ABCE is encoded by a single-copy gene; by contrast, Arabidopsis thaliana has two ABCE paralogs, of which ABCE2 seems to conserve the ancestral function. We isolated apiculata7-1 (api7-1), a viable, hypomorphic allele of ABCE2, which has a pleiotropic morphological phenotype reminiscent of mutations affecting ribosome biogenesis factors and ribosomal proteins. We also studied api7-2, a null, recessive lethal allele of ABCE2. Co-immunoprecipitation experiments showed that ABCE2 physically interacts with components of the translation machinery. An RNA-seq study of the api7-1 mutant showed increased responses to iron and sulfur starvation. We also found increased transcript levels of genes related to auxin signaling and metabolism. Our results support a conserved role for ABCE proteins in ribosome recycling in plants, as previously shown for the animal, fungal, and archaeal lineages. In plants, the ABCE2 protein seems important for general growth and vascular development, likely due to an indirect effect through auxin metabolism.

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“…In a second positive feedback loop, PIN1‐mediated canalisation of auxin through a narrow strand of preprocambial cells further reinforces PIN1 expression (Sauer et al ., 2006; Scarpella et al ., 2006; Wenzel et al ., 2007). Simultaneously, MP induces the expression of ARABIDOPSIS THALIANA HOMEOBOX 8 ( ATHB8 ), which encodes an HD‐ZIP III transcription factor that marks preprocambial cell identity and stabilises PIN1 localisation (Baima et al ., 1995; Mattsson et al ., 2003; Donner et al ., 2009). These markers and others of preprocambial and procambial cells have allowed vascular development in the Arabidopsis leaf to be described more comprehensively than in any monocot leaf (Scarpella et al ., 2004; Sawchuk et al ., 2007).…”

Section: Ontogeny Of Leaf Veinsmentioning

confidence: 99%

Developmental regulation of leaf venation patterns: monocot versus eudicots and the role of auxin

2022

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Summary Organisation and patterning of the vascular network in land plants varies in different taxonomic, developmental and environmental contexts. In leaves, the degree of vascular strand connectivity influences both light and CO2 harvesting capabilities as well as hydraulic capacity. As such, developmental mechanisms that regulate leaf venation patterning have a direct impact on physiological performance. Development of the leaf venation network requires the specification of procambial cells within the ground meristem of the primordium and subsequent proliferation and differentiation of the procambial lineage to form vascular strands. An understanding of how diverse venation patterns are manifest therefore requires mechanistic insight into how procambium is dynamically specified in a growing leaf. A role for auxin in this process was identified many years ago, but questions remain. In this review we first provide an overview of the diverse venation patterns that exist in land plants, providing an evolutionary perspective. We then focus on the developmental regulation of leaf venation patterns in angiosperms, comparing patterning in eudicots and monocots, and the role of auxin in each case. Although common themes emerge, we conclude that the developmental mechanisms elucidated in eudicots are unlikely to fully explain how parallel venation patterns in monocot leaves are elaborated.

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The expression of the Athb-8 homeobox gene is restricted to provascular cells in Arabidopsis thaliana

Cited by 341 publications

References 41 publications

High temperature perception in leaves promotes vascular regeneration and graft formation in distant tissues

High temperature perception in leaves promotes vascular regeneration and graft formation in distant tissues

The Arabidopsis ATP-Binding Cassette E protein ABCE2 is a conserved component of the translation machinery

Developmental regulation of leaf venation patterns: monocot versus eudicots and the role of auxin

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