A five-transgene cassette confers broad-spectrum resistance to a fungal rust pathogen in wheat
Luo et al. generate polygenic Pgt resistance by introducing a transgene cassette of five resistance genes into bread wheat as a single locus and show that at least four of the five genes are functional. These wheat lines are resistant to aggressive and highly virulent Pgt isolates from around the world and show very high levels of resistance in the field. The simple monogenic inheritance of this multigene locus greatly simplifies its use in breeding. However, a new Pgt isolate with virulence to several genes at this locus suggests gene stacks will need strategic deployment to maintain their effectiveness.
Monolingual searches can limit and bias results in global literature reviews
Haddaway and colleagues recently published a Perspective1 in Nature Ecology & Evolution aimed at improving the process of evidence synthesis in ecology. However, Nuñez & Amano highlight a key issue absent from this Perspective, particularly from the discussion of publication bias: the need to search and analyse literature in multiple languages.
Nature Ecology & Evolution
Horizontal genome transfer by cell-to-cell travel of whole organelles
Hertle et al. used grafting to identify the mechanisms involved in plastid genome transfer from plant to plant. They show that during proliferation of wound-induced callus, plastids dedifferentiate into small, highly motile, amoeboid organelles. Simultaneously, new intercellular connections emerge by localized cell wall disintegration, forming connective pores through which amoeboid plastids move into neighboring cells.
Forest Management Under Megadrought: Urgent Needs at Finer-Scale and Higher-Intensity
Field et al. identify potential anticipatory and/or concurrent options for non-timber forest management actions under megadrought, which by necessity are focused more at finer spatial scales such as the stand level using higher-intensity management. These management actions build on silvicultural practices focused on growth and yield (but not harvest).
Frontiers in Forests and Global Change
The evolutionary history of sedges (Cyperaceae) in Madagascar - Larridon
The biogeographical history of Cyperaceae in Madagascar is a chronicle of relatively recent multiple in and out processes of long‐distance dispersal colonizations constrained by distance. Also, the Madagascar region is not only a ‘sink’ for immigrant taxa, in situ diversification and dispersal to other regions also occurred. Some of the most diverse endemic lineages show clear adaptation to local environments.
Journal of Biogeography
Proposal to change the conserved type of Ipomoea, nom. cons. (Convolvulaceae)
Biologists propose changing the type of Ipomea, in order to preserve the name of sweet potato. Ipomoea batatas (L.)
CcLBD25 functions as a key regulator of haustorium development in Cuscuta campestris
Jhu et al. analyzed the transcriptome of six C. campestris tissues and identified a key gene, CcLBD25, as highly expressed in prehaustoria and haustoria. Their gene co-expression networks (GCN) from different tissue types and laser-capture microdissection (LCM) RNA-Seq data indicate that CcLBD25 could be essential for regulating cell wall loosening and organogenesis.
Antiviral activity of bacterial TIR domains via signaling molecules that trigger cell death
Ofir et al. report that phage infection triggers Thoeris TIR-domain proteins to produce an isomer of cyclic ADP-ribose. This molecular signal activates a second protein, ThsA, which then depletes the cell of the essential molecule nicotinamide adenine dinucleotide (NAD) and leads to abortive infection and cell death.
A New Species of Goniopteris (Thelypteridaceae) from Hispaniola
Goniopteris baorucensis, a species known only from the Sierra Baoruco in the southern Dominican Republic, is illustrated and described as new to science. Recent phylogenetic studies have inferred it as a member of a clade of predominantly calciphilic Goniopteris that are largely endemic to the Antilles.
A digital 3D reference atlas reveals cellular growth patterns shaping the Arabidopsis ovule
Using machine-learning-based digital image analysis, Vijayan et al. generated a three-dimensional atlas of ovule development in Arabidopsis thaliana, enabling the quantitative spatio-temporal analysis of cellular and gene expression patterns with cell and tissue resolution. They discovered novel morphological manifestations of ovule polarity, a new mode of cell layer formation, and previously unrecognized subepidermal cell populations that initiate ovule curvature.