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Newly sequenced seagrass genomes unveil a hexaploid ancestry for seagrasses. The transition to marine environments involved fine-tuning of many processes that all had to happen in parallel, probably explaining why adaptation to a marine lifestyle has been rare.

Stomata regulate gas exchange and help plants cope with abiotic stress. The authors identify a signalling pathway that coordinates the balance between stomatal opening and closing under high-temperature and/or drought conditions.

Siegbert Melzer and colleagues report that in Arabidopsis the absence of MADS box proteins SOC1 and FUL leads to phenotypes of perennial woody plants, with indeterminate meristems, secondary growth with wood formation, and recurrent growth cycles.

Sensing of the plant hormone auxin involves formation of a co-receptor complex consisting of an F-box protein and an AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) transcriptional repressor. Distinct co-receptor combinations might provide cells with an unexpectedly broad range of auxin-sensing capacities and contribute to diverse transcriptional programs activated by different auxin levels in various developmental contexts.

Stomata regulate gas exchange between plants and the atmosphere but whether the plant hormone auxin regulates stomatal development has not been investigated. Here, the authors reveal dynamic changes of auxin activity levels during stomatal development and show that auxin transporters are required for stomatal patterning.

A comprehensive proteomics-based interactome map of adaptor protein complexes in Arabidopsis identifies P34 as a key regulator of the stability of clathrin-associated adaptors and their related trafficking routes.

Auxin rapidly modulates root growth through simultaneous activation of two opposing mechanisms—TMK1-mediated apoplast acidification and TIR1/AFB-mediated apoplast alkalinization.

All flowers eventually die. Stigma in Arabidopsis flowers can only be pollinated for a limited amount of time. Two NAC transcription factors named KIRA1 and ORESARA1 control cell death in papilla cells, as well as the stigma life span.

Lateral root development is dependent on precise control of the distribution of the plant hormone auxin. Here Chen et al. propose the transcription factors ARF7 and FLP participate in a feed forward motif to mediate expression of the auxin transporter PIN3and consequently regulate lateral root development.

The concerted action of the hormones cytokinin and auxin is an important regulator of plant development. Here Šimášková et al. propose a mechanistic basis by which cytokinin-responsive transcription factors regulate transport of auxin in Arabidopsisroots.

Plants respond to reorientation by altering the distribution of the plant hormone auxin causing roots to bend towards gravity. Here Wang et al. find that expression of the PIN3 and PIN7 auxin transporters in gravity sensing cells is controlled by concerted action of the FLP and MYB88 transcription factors.

The plant hormone auxin affects many aspects of root development, including lateral root branching. A high-throughput screen in Arabidopsis thaliana has led to the identification of naxillin, a non-auxin chemical probe that enhances lateral root branching and has revealed an important role of the root cap in regulating this process.

The phytohormone auxin coordinates plant growth by forming local maxima and gradients through cell-to-cell transport and metabolic control. Recent research has identified novel signalling mechanisms involving extracellular auxin perception and auxin-mediated cyclic AMP production.