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  • A recent study suggests that the optimal temperature for symbiotic nitrogen fixation rates exceeds the plant’s preferred growth temperature in laboratory conditions. A few degrees of warming could thereby increase or decrease nitrogen fixation rates, depending on the optimal rate among species.

    • Ying-Ping Wang
    • Benjamin Z. Houlton
    News & Views
  • New evidence that a mid-Cretaceous fossil represents a modern angiosperm genus partly reinstates Darwin’s view of the fossil record.

    • Richard J. A. Buggs
    News & Views
  • Growth defects associated with disruption of the mildew susceptibility gene MLO are rescued in bread wheat and Arabidopsis by transcriptional activation of a proximal monosaccharide transporter

    • Pietro D. Spanu
    News & Views
  • Thousands of plants are known to be edible, yet we lack nutritional data for many of them. This study predicts the B-vitamin profiles for edible plants and finds many have the potential to help alleviate deficiencies and should be conservation priorities.

    • Aoife Cantwell-Jones
    • Jenny Ball
    • Samuel Pironon
    Article
  • It has been calculated that 14% of the world’s tree species are yet to be identified. But is that a lot or a little?

    Editorial
  • The difference in phloem pressure is the driving force that moves photosynthetic products and other solutes from the source to the sink. Measurements with emerging technologies reveal that sugar loading is not essential for maintaining phloem pressure and phloem bulk flow in the maize sugar-loading-defective mutant sut1.

    • Li-Qing Chen
    News & Views
  • Loading of osmolytes into the phloem drives a pressure-flow transport mechanism. A maize sucrose transporter1 loss-of-function mutant has much reduced export of carbon from leaves, but increased potassium concentrations maintain phloem pressure.

    • Benjamin A. Babst
    • David M. Braun
    • Kaare H. Jensen
    Article
  • Equatorial latitudes are often assumed to be regions of high biodiversity from which new species radiate. However, late Silurian–Early Devonian strata show that during their first major diversification, land plants were less diverse in the tropics.

    • Charles H. Wellman
    • Christopher M. Berry
    • Amy Wyatt
    Letter
  • The bound loci and functions of chromatin-associated RNAs remain unclear in rice. This study develops an RNA–DNA mapping method to reveal the identity and interaction patterns around active promoters within hierarchical genome architecture.

    • Qin Xiao
    • Xingyu Huang
    • Xingwang Li
    Article
  • Dual recognition specificity of an MLA immune receptor in barley demonstrates that the deployment of mildew-resistant cultivars by plant breeders has unintentionally affected nonhost resistance to wheat stripe rust.

    • Isabel M. L. Saur
    • Aaron W. Lawson
    • Paul Schulze-Lefert
    News & Views
  • Mistakes in the maintenance of CG methylation are a source of heritable epimutations in plants. This study systematically identifies and characterizes epimutation hotspots along the Arabidopsis genome and dissects their molecular properties.

    • Rashmi R. Hazarika
    • Michele Serra
    • Frank Johannes
    Article