| 1. |
- Bourdon, Matthieu, et al.
(författare)
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Ectopic callose deposition into woody biomass modulates the nano-architecture of macrofibrils
- 2023
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Ingår i: Nature Plants. - : Springer Nature. - 2055-0278 .- 2055-026X. ; 9:9, s. 1530-1546
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Tidskriftsartikel (refereegranskat)abstract
- Plant biomass plays an increasingly important role in the circular bioeconomy, replacing non-renewable fossil resources. Genetic engineering of this lignocellulosic biomass could benefit biorefinery transformation chains by lowering economic and technological barriers to industrial processing. However, previous efforts have mostly targeted the major constituents of woody biomass: cellulose, hemicellulose and lignin. Here we report the engineering of wood structure through the introduction of callose, a polysaccharide novel to most secondary cell walls. Our multiscale analysis of genetically engineered poplar trees shows that callose deposition modulates cell wall porosity, water and lignin contents and increases the lignin–cellulose distance, ultimately resulting in substantially decreased biomass recalcitrance. We provide a model of the wood cell wall nano-architecture engineered to accommodate the hydrated callose inclusions. Ectopic polymer introduction into biomass manifests in new physico-chemical properties and offers new avenues when considering lignocellulose engineering.
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| 2. |
- Eriksson, Dennis
(författare)
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Options for regulating new genomic techniques for plants in the European Union
- 2023
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Ingår i: Nature Plants. - 2055-026X .- 2055-0278. ; 9, s. 1958–1961-
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Tidskriftsartikel (refereegranskat)abstract
- Which option for regulating plants derived from new genomic techniques in European Union law is feasible and justifiable scientifically? The European Commission has proposed a new regulation on plants obtained by specific new genomic techniques, which is now subject to discussion in the legislative process. From the perspective of the European Commission's envisaged legal reforms of European Union law towards the integration of greater sustainability, we conclude that the option focusing on plant traits delivering sustainability benefits should be chosen, which is most fitting to facilitate a contribution to climate action, the transition towards climate neutrality, and promptly integrate sustainability into all food-related policies. To assist the decision-making in the legislative process, we outline six regulatory options resulting from regulatory research involving interdisciplinary teams.This Perspective discusses six regulatory options following the proposition of the European Commission to amend European Union's legislation for plants obtained with new genomic techniques.
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| 3. |
- Fridman, Jonas, et al.
(författare)
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The global biogeography of tree leaf form and habit
- 2023
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Ingår i: Nature Plants. - 2055-026X .- 2055-0278. ; 9, s. 1795-1809
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Tidskriftsartikel (refereegranskat)abstract
- Understanding what controls global leaf type variation in trees is crucial for comprehending their role in terrestrial ecosystems, including carbon, water and nutrient dynamics. Yet our understanding of the factors influencing forest leaf types remains incomplete, leaving us uncertain about the global proportions of needle-leaved, broadleaved, evergreen and deciduous trees. To address these gaps, we conducted a global, ground-sourced assessment of forest leaf-type variation by integrating forest inventory data with comprehensive leaf form (broadleaf vs needle-leaf) and habit (evergreen vs deciduous) records. We found that global variation in leaf habit is primarily driven by isothermality and soil characteristics, while leaf form is predominantly driven by temperature. Given these relationships, we estimate that 38% of global tree individuals are needle-leaved evergreen, 29% are broadleaved evergreen, 27% are broadleaved deciduous and 5% are needle-leaved deciduous. The aboveground biomass distribution among these tree types is approximately 21% (126.4Gt), 54% (335.7Gt), 22% (136.2Gt) and 3% (18.7Gt), respectively. We further project that, depending on future emissions pathways, 17-34% of forested areas will experience climate conditions by the end of the century that currently support a different forest type, highlighting the intensification of climatic stress on existing forests. By quantifying the distribution of tree leaf types and their corresponding biomass, and identifying regions where climate change will exert greatest pressure on current leaf types, our results can help improve predictions of future terrestrial ecosystem functioning and carbon cycling. Integrating inventory data with machine learning models reveals the global composition of tree types-needle-leaved evergreen individuals dominate, followed by broadleaved evergreen and deciduous trees-and climate change risks.
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| 4. |
- Gutierrez, Emilio, et al.
(författare)
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Phenolic acid-induced phase separation and translation inhibition mediate plant interspecific competition
- 2023
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Ingår i: Nature Plants. - 2055-026X .- 2055-0278. ; 9, s. 1481–1499-
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Tidskriftsartikel (refereegranskat)abstract
- Phenolic acids (PAs) secreted by donor plants suppress the growth of their susceptible plant neighbours. However, how structurally diverse ensembles of PAs are perceived by plants to mediate interspecific competition remains a mystery. Here we show that a plant stress granule (SG) marker, RNA-BINDING PROTEIN 47B (RBP47B), is a sensor of PAs in Arabidopsis. PAs, including salicylic acid, 4-hydroxybenzoic acid, protocatechuic acid and so on, directly bind RBP47B, promote its phase separation and trigger SG formation accompanied by global translation inhibition. Salicylic acid-induced global translation inhibition depends on RBP47 family members. RBP47s regulate the proteome rather than the absolute quantity of SG. The rbp47 quadruple mutant shows a reduced sensitivity to the inhibitory effect of the PA mixture as well as to that of PA-rich rice when tested in a co-culturing ecosystem. In this Article, we identified the long sought-after PA sensor as RBP47B and illustrated that PA-induced SG-mediated translational inhibition was one of the PA perception mechanisms.Allelopathy-the chemical competition between neighbouring plants-has been observed for centuries. This study identifies a sensor of phenolic allelochemicals and reveals translational control as a key mechanism.
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| 5. |
- Ma, Yuan, et al.
(författare)
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Multiple mechanisms behind plant bending
- 2023
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Ingår i: Nature Plants. - : Springer Science and Business Media LLC. - 2055-026X .- 2055-0278. ; 9, s. 13-21
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Tidskriftsartikel (refereegranskat)abstract
- To survive, plants constantly adapt their body shape to their environment. This often involves remarkably rapid bending of their organs such as stems, leaves and roots. Since plant cells are enclosed by stiff cell walls, they use various strategies for bending their organs, which differ from bending mechanisms of soft animal tissues and involve larger physical forces. Here we attempt to summarize and link different viewpoints on bending mechanisms: genes and signalling, mathematical modelling and biomechanics. We argue that quantifying cell growth and physical forces could open a new level in our understanding of bending and resolve some of its paradoxes.
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| 6. |
- Yu, Lei, et al.
(författare)
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Ocean current patterns drive the worldwide colonization of eelgrass (Zostera marina)
- 2023
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Ingår i: Nature Plants. - 2055-026X .- 2055-0278. ; 9:8, s. 1207-1220
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Tidskriftsartikel (refereegranskat)abstract
- Currents are unique drivers of oceanic phylogeography and thus determine the distribution of marine coastal species, along with past glaciations and sea-level changes. Here we reconstruct the worldwide colonization history of eelgrass (Zostera marina L.), the most widely distributed marine flowering plant or seagrass from its origin in the Northwest Pacific, based on nuclear and chloroplast genomes. We identified two divergent Pacific clades with evidence for admixture along the East Pacific coast. Two west-to-east (trans-Pacific) colonization events support the key role of the North Pacific Current. Time-calibrated nuclear and chloroplast phylogenies yielded concordant estimates of the arrival of Z. marina in the Atlantic through the Canadian Arctic, suggesting that eelgrass-based ecosystems, hotspots of biodiversity and carbon sequestration, have only been present there for ~243ky (thousand years). Mediterranean populations were founded ~44kya, while extant distributions along western and eastern Atlantic shores were founded at the end of the Last Glacial Maximum (~19kya), with at least one major refuge being the North Carolina region. The recent colonization and five- to sevenfold lower genomic diversity of the Atlantic compared to the Pacific populations raises concern and opportunity about how Atlantic eelgrass might respond to rapidly warming coastal oceans.
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| 7. |
- Giaume, Francesca, et al.
(författare)
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Two florigens and a florigen-like protein form a triple regulatory module at the shoot apical meristem to promote reproductive transitions in rice
- 2023
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Ingår i: Nature Plants. - : Springer Nature. - 2055-0278. ; 9:4, s. 525-534
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Tidskriftsartikel (refereegranskat)abstract
- Many plant species monitor and respond to changes in day length (photoperiod) for aligning reproduction with a favourable season. Day length is measured in leaves and, when appropriate, leads to the production of floral stimuli called florigens that are transmitted to the shoot apical meristem to initiate inflorescence development. Rice possesses two florigens encoded by HEADING DATE 3a (Hd3a) and RICE FLOWERING LOCUS T 1 (RFT1). Here we show that the arrival of Hd3a and RFT1 at the shoot apical meristem activates FLOWERING LOCUS T-LIKE 1 (FT-L1), encoding a florigen-like protein that shows features partially differentiating it from typical florigens. FT-L1 potentiates the effects of Hd3a and RFT1 during the conversion of the vegetative meristem into an inflorescence meristem and organizes panicle branching by imposing increasing determinacy to distal meristems. A module comprising Hd3a, RFT1 and FT-L1 thus enables the initiation and balanced progression of panicle development towards determinacy.
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| 8. |
- Zhou, Yu, et al.
(författare)
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Grafting Rhodobacter sphaeroides with red algae Rubisco to accelerate catalysis and plant growth
- 2023
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Ingår i: NATURE PLANTS. - : Springer Nature. - 2055-0278. ; 9, s. 978-986
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Tidskriftsartikel (refereegranskat)abstract
- Improving the carboxylation properties of Rubisco has primarily arisen from unforeseen amino acid substitutions remote from the catalytic site. The unpredictability has frustrated rational design efforts to enhance plant Rubisco towards the prized growth-enhancing carboxylation properties of red algae Griffithsia monilis GmRubisco. To address this, we determined the crystal structure of GmRubisco to 1.7 angstrom. Three structurally divergent domains were identified relative to the red-type bacterial Rhodobacter sphaeroides RsRubisco that, unlike GmRubisco, are expressed in Escherichia coli and plants. Kinetic comparison of 11 RsRubisco chimaeras revealed that incorporating C329A and A332V substitutions from GmRubisco Loop 6 (corresponding to plant residues 328 and 331) into RsRubisco increased the carboxylation rate (kcatc) by 60%, the carboxylation efficiency in air by 22% and the CO2/O-2 specificity (Sc/o) by 7%. Plastome transformation of this RsRubisco Loop 6 mutant into tobacco enhanced photosynthesis and growth up to twofold over tobacco producing wild-type RsRubisco. Our findings demonstrate the utility of RsRubisco for the identification and in planta testing of amino acid grafts from algal Rubisco that can enhance the enzyme's carboxylase potential.
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