Back to basics: what is the function of an Aux/<scp>IAA</scp> in auxin response?

Nemhauser, Jennifer L.

doi:10.1111/nph.15172

Cited by 18 publications

(13 citation statements)

References 18 publications

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“…The lower IAA level in HydWet was supported by the findings of higher expression of Aux/IAA transcription factor genes in the transcriptome analysis. The functions of Aux/IAA‐responsive genes are becoming increasingly complex, but one of the major overarching functions of Aux/IAA transcription factors is suppressing expression of auxin‐responsive genes when IAA level is low (Leyser, 2018; Nemhauser, 2018). It should be mentioned that a higher Aux/IAA expression level was also reported in HydWet in a study using de‐tipped roots in cucumber compared with HydDry (Fujii et al , 2018).…”

Section: Discussionmentioning

confidence: 99%

Hydrotropism in the primary roots of maize

et al. 2020

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Recent studies mainly in Arabidopsis have renewed interest and discussion in some of the key issues in hydrotropism of roots, such as the site of water sensing and the involvement of auxin. We examined hydrotropism in maize (Zea mays) primary roots.We determined the site of water sensing along the root using a nonintrusive method. Kinematic analysis was conducted to investigate spatial root elongation during hydrotropic response. Indole-3-acetic acid (IAA) and other hormones were quantified using LC-MS/MS. The transcriptome was analyzed using RNA sequencing.Main results: The very tip of the root is the most sensitive to the hydrostimulant. Hydrotropic bending involves coordinated adjustment of spatial cell elongation and cell flux. IAA redistribution occurred in maize roots, preceding hydrotropic bending. The redistribution is caused by a reduction of IAA content on the side facing a hydrostimulant, resulting in a higher IAA content on the dry side. Transcriptomic analysis of the elongation zone prior to bending identified IAA response and lignin synthesis/wall cross-linking as some of the key processes occurring during the early stages of hydrotropic response.We conclude that maize roots differ from Arabidopsis in the location of hydrostimulant sensing and the involvement of IAA redistribution.

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Section: Discussionmentioning

confidence: 99%

Hydrotropism in the primary roots of maize

et al. 2020

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“…Additionally, we found OGs related to hormone signaling in the monocot nourishing tissue (Figure 9G): two OGs corresponding to the INDOLE-3-ACETIC ACID INDUCIBLE (IAA) family of proteins, implicated in auxin signaling (Nemhauser, 2018), and OGs related to gibberellin and ethylene signaling, like GIBBERELLIC ACID INSENSITIVE (GAI) (Peng et al ., 1997), and ETHYLENE-RESPONSIVE ELEMENT BINDING PROTEIN (EBP) (Büttner & Singh, 1997).…”

Section: Resultsmentioning

confidence: 99%

“…Among other sets of transcriptional regulators found in this OG set, are bromodomain containing proteins which likely function as epigenetic regulators (Jarończyk et al, 2021): two OGs encoding bromodomain-containing proteins, the histone acetyltransferase TBP-ASSOCIATED FACTOR 1 (HAF01) and BROMODOMAIN AND EXTRATERMINAL DOMAIN PROTEIN 9 (BET9) (Pandey, 2002), were found exclusively in the monocot endosperm (Figure 9F). Additionally, we found OGs related to hormone signaling in the monocot nourishing tissue (Figure 9G): two OGs corresponding to the INDOLE-3-ACETIC ACID INDUCIBLE (IAA) family of proteins, implicated in auxin signaling (Nemhauser, 2018), and OGs related to gibberellin and ethylene signaling, like GIBBERELLIC ACID INSENSITIVE (GAI) (Peng et al, 1997), and ETHYLENE-RESPONSIVE ELEMENT BINDING PROTEIN (EBP) (Büttner & Singh, 1997). Likewise, we detected 187 DEOGs that were exclusive to the eudicot endosperms (Hypergeometric test p-value: 8,10E-03, Figure 3C, Figure S2; Table S9).…”

Section: Patternsmentioning

confidence: 99%

Comparative transcriptomics of seed nourishing tissues: uncovering conserved and divergent pathways in seed plants

Florez-Rueda,

Miguel,

Figueiredo

2023

Preprint

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SummaryThe evolutionary and ecological success of Spermatophytes is intrinsically linked to the seed habit, which provides a protective environment for the pre-development of the new generation. This environment includes an ephemeral nourishing tissue that supports embryo growth. In gymnosperms this tissue originates from the asexual proliferation of the maternal megagametophyte, while in angiosperms it is a product of fertilization, and is called the endosperm. The emergence of these nourishing tissues is of profound evolutionary value, and they are also food staples for most of the world’s population. Here, using orthogroup inference, we provide a comparative transcriptomic analysis of seed nourishing tissues from representative species of all main angiosperm clades, including those of early diverging basal angiosperms, and of two gymnosperm representatives. Our results show that, although the structure and composition of seed nourishing tissues has seen significant divergence along evolution, there are signatures that are conserved throughout the phylogeny. Conversely, we identified processes that are exclusive to each clade, and thus illustrate their functional divergence. With this, we aimed to provide a foundation for future studies on the evolutionary history of seed nourishing structures, as well as a resource for gene discovery in new functional studies.Significance StatementWithin seeds a specialized structure is responsible for nourishing the embryo, and is thus analogous to the mammalian placenta. Moreover, these nourishing tissues are also important sources of staple foods and feed. Here, we provide novel gene expression datasets of nourishing tissues of early diverging angiosperms, and use this information for a meta-analysis to identify pathways conserved, or divergent, throughout evolution. Thus, we aim to provide a resource for gene discovery for seed biology studies.

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“…Canonical auxin signaling occurs through the activity of a suite of deeply conserved transcriptional regulators found in all land plants ( 3 , 5 , 6 ). The AUXIN/INDOLE-3-ACETIC- ACID repressors (AUX/IAAs), AUXIN RESPONSE FACTORS (ARFs) and the TRANSPORT INHIBITOR RESPONSE 1 /AUXIN-SIGNALING F-BOX (TIR1/AFB) co-receptors are components of the best-characterized pathway of auxin-mediated transcriptional regulation (reviewed by ( 7–9 )). All three components are in multigene families that have greatly expanded in flowering plants ( 3 ).…”

Section: Main Textmentioning

confidence: 99%

Comparative mutant analyses reveal a novel mechanism of ARF regulation in land plants

Prigge,

Morffy,

de Neve

et al. 2023

Preprint

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A major challenge in plant biology is to understand how the plant hormone auxin regulates diverse transcriptional responses throughout development, in different environments, and in different species. The answer may lie in the specific complement of auxin signaling components in each cell. The balance between activators (class-A AUXIN RESPONSE FACTORS) and repressors (class-B ARFs) is particularly important. It is unclear how this balance is achieved. Through comparative analysis of novel, dominant mutants in maize and the mossPhyscomitrium patens, we have discovered a ∼500-million-year-old mechanism of class-B ARF protein level regulation, important in determining cell fate decisions across land plants. Thus, our results add a key piece to the puzzle of how auxin regulates plant development.

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Back to basics: what is the function of an Aux/IAA in auxin response?

Abstract: This article is a Commentary on Tao & Estelle, 218: 1534–1542.

Cited by 18 publications

References 18 publications

Hydrotropism in the primary roots of maize

Hydrotropism in the primary roots of maize

Comparative transcriptomics of seed nourishing tissues: uncovering conserved and divergent pathways in seed plants

Comparative mutant analyses reveal a novel mechanism of ARF regulation in land plants

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