Volume 1 Issue 7 July 2015

Volume 1 Issue 7

Regressive tendencies

Most plant cells retain the ability to regenerate an entire plant but what stops them doing so? One answer is the POLYCOMB REPRESSIVE COMPLEX 2 (PRC2) which maintains suppression of specific genes through histone modification. In plants with dysfunctional PRC2 root hairs fall back into a disorganized state and even produce new embryos as shown here.

See Momoko Ikeuchi et al. 1, 15089 (2015)

K. Moore from original image by Momoko Ikeuchi

Editorial

  • Editorial |

    The subject of extinction and de-extinction are much in the news at the moment, but discussions tend to focus on the loss or resurrection of charismatic animals like tigers or tyrannosaurs. Where is the talk of the plant species that have been lost and that might be worth bringing back?

Comment

  • Comment |

    The newly launched Diversity Seek initiative emphasizes the importance of state-of-the-art phenotypic and genotypic information. But to achieve its aims, it will also need to encourage the management of historical data, such as the metadata on the germplasm collections themselves.

    • Rachel S. Meyer

Research Highlights

Correspondence

News & Views

  • News and Views |

    Grasslands account for as much as one-third of the net primary production on land. Results from a network of experiments carried out on five continents suggest that two or more nutrients often constrain the productivity of these globally significant ecosystems.

    • Peter M. Vitousek
  • News and Views |

    Over-application of nitrogen fertilizer leads to environmental problems in modern agricultural systems. The mining of favourable gene variants for nitrogen-use efficiency is a fundamental way to tackle these dangers.

    • Dai-Yin Chao
    •  & Hong-Xuan Lin
  • News and Views |

    Plant researchers have speculated about the need for mechanisms to lock-down cell fate in late development. In PRC2 mutants, specialized, endoreplicated root hair cells differentiate normally but later revert to an embryo-like state.

    • Kenneth D. Birnbaum
  • News and Views |

    Hypoxia has long been studied in relation to anaerobic metabolism. It has now been shown to control development, acting as a cue to maintain the seedling's protective apical hook and a trigger of developmental decisions both before and after the plantlet emerges from the soil into the light.

    • Laurentius A. C. Voesenek
    •  & Julia Bailey-Serres
  • News and Views |

    Auxin binds to its receptor within a ubiquitin ligase complex and promotes the binding and degradation of transcriptional repressors. The discovery of a cyclophilin isomerase enzyme critical in this process adds a new twist to auxin signalling.

    • Shih-Heng Su
    • , William M. Gray
    •  & Patrick H. Masson

Research

  • Article |

    Terrestrial ecosystem productivity is widely accepted to be nutrient limited. A series of standardized nutrient addition experiments, carried out on grasslands on five continents, suggests aboveground grassland productivity is commonly limited by multiple nutrients, including potassium and micronutrients.

    • Philip A. Fay
    • , Suzanne M. Prober
    • , W. Stanley Harpole
    • , Johannes M. H. Knops
    • , Jonathan D. Bakker
    • , Elizabeth T. Borer
    • , Eric M. Lind
    • , Andrew S. MacDougall
    • , Eric W. Seabloom
    • , Peter D. Wragg
    • , Peter B. Adler
    • , Dana M. Blumenthal
    • , Yvonne M. Buckley
    • , Chengjin Chu
    • , Elsa E. Cleland
    • , Scott L. Collins
    • , Kendi F. Davies
    • , Guozhen Du
    • , Xiaohui Feng
    • , Jennifer Firn
    • , Daniel S. Gruner
    • , Nicole Hagenah
    • , Yann Hautier
    • , Robert W. Heckman
    • , Virginia L. Jin
    • , Kevin P. Kirkman
    • , Julia Klein
    • , Laura M. Ladwig
    • , Qi Li
    • , Rebecca L. McCulley
    • , Brett A. Melbourne
    • , Charles E. Mitchell
    • , Joslin L. Moore
    • , John W. Morgan
    • , Anita C. Risch
    • , Martin Schütz
    • , Carly J. Stevens
    • , David A. Wedin
    •  & Louie H. Yang
  • Article |

    The contribution of epigenetic factors to inbreeding depression and heterosis remains elusive. Now epigenetic Arabidopsis hybrids show that epigenetic diversity and regulation contribute to both.

    • Mélanie Dapp
    • , Jon Reinders
    • , Alexis Bédiée
    • , Crispulo Balsera
    • , Etienne Bucher
    • , Gregory Theiler
    • , Christine Granier
    •  & Jerzy Paszkowski
  • Article |

    Plant somatic cells are totipotent, but once differentiated, must keep their own identity and function. Chromatin regulator PRC2 represses downstream transcription factors and prevents dedifferentiation and division of fully mature root hair cells.

    • Momoko Ikeuchi
    • , Akira Iwase
    • , Bart Rymen
    • , Hirofumi Harashima
    • , Michitaro Shibata
    • , Mariko Ohnuma
    • , Christian Breuer
    • , Ana Karina Morao
    • , Miguel de Lucas
    • , Lieven De Veylder
    • , Justin Goodrich
    • , Siobhan M. Brady
    • , François Roudier
    •  & Keiko Sugimoto
  • Article |

    The V-ATPase impaired in the det3 mutant acidifies trans-Golgi network/early endosome, and is needed for exocytosis of cargo vesicles, which are involved in recycling important membrane proteins such as the brassinoid receptor and cellulose synthase.

    • Yu Luo
    • , Stefan Scholl
    • , Anett Doering
    • , Yi Zhang
    • , Niloufer G. Irani
    • , Simone Di Rubbo
    • , Lutz Neumetzler
    • , Praveen Krishnamoorthy
    • , Isabelle Van Houtte
    • , Evelien Mylle
    • , Volker Bischoff
    • , Samantha Vernhettes
    • , Johan Winne
    • , Jiří Friml
    • , York-Dieter Stierhof
    • , Karin Schumacher
    • , Staffan Persson
    •  & Eugenia Russinova
  • Article |

    Phytochromes are bistable molecular switches that control plant light responses. Phytochromes A and B have similar absorption properties but different effects. Modelling of phytochrome B function shows that dimerization underlies its specific activity.

    • Cornelia Klose
    • , Filippo Venezia
    • , Andrea Hussong
    • , Stefan Kircher
    • , Eberhard Schäfer
    •  & Christian Fleck