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Brendel, Volker; Kurtz, Stefan; Walbot, Virginia

doi:10.1186/gb-2002-3-3-reviews1005

Cited by 41 publications

(5 citation statements)

References 29 publications

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“…However, the amplitudes of major lipids - MGDG, DGDG, and PC were much lower in Arabidopsis compared to the three grasses. These results suggest the conservation of chilling tolerance-induced changes in lipid content and composition and rhythmic patterns of lipids across grasses and Arabidopsis despite 150 million years of divergence between monocots and eudicots (41).…”

Section: Resultsmentioning

confidence: 90%

Rhythmic lipid and gene expression responses to chilling in panicoid grasses

Raju,

Zhang,

Mahboub

et al. 2023

Preprint

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Chilling stress threatens plant growth and development, particularly affecting membrane fluidity and cellular integrity. Understanding plant membrane responses to chilling stress is important for unraveling the molecular mechanisms of stress tolerance. Whereas core transcriptional responses to chilling stress and stress tolerance are conserved across species, the associated changes in membrane lipids appear to be less conserved, as which lipids are affected by chilling stress varies by species. Here, we investigated changes in gene expression and membrane lipids in response to chilling stress during one diurnal cycle in sorghum (Sorghum bicolor), Urochloa (browntop signal grass,Urochloa fusca) (lipids only), and foxtail millet (Setaria italica), leveraging their evolutionary relatedness and differing levels of chilling-stress tolerance. We show that most chilling-induced lipid changes are conserved across the three species, while we observed distinct, time-specific responses in chilling-tolerant foxtail millet, indicating the presence of a finely orchestrated adaptive mechanism. We detected diurnal rhythmicity in lipid responses to chilling stress in the three grasses, which were also present in Arabidopsis (Arabidopsis thaliana), suggesting the conservation of rhythmic patterns across species and highlighting the importance of accounting for diurnal effects. When integrating lipid datasets with gene expression profiles, we identified potential candidate genes that showed corresponding transcriptional changes in response to chilling stress, providing insights into the differences in regulatory mechanisms between chilling-sensitive sorghum and chilling-tolerant foxtail millet.Significance StatementPlants respond to low-temperature stress in myriad ways. While core transcriptional changes are conserved across species, specific adaptive strategies do exist. However, membrane lipid responses during chilling do not appear to be conserved. Here, we collected samples from control and chilling stress–treated seedlings [PSC4] to assess gene expression and membrane lipids in three panicoid grasses to show that lipid metabolic changes follow a daily rhythm. Lipid changes in chilling-tolerant foxtail millet occurred at specific time points, partly explaining the difficulty in finding conserved chilling-induced lipid changes in previous reports. We identified specific orthologs in sorghum and foxtail millet that showed a correlation between gene expression and lipid metabolic changes; these orthologs may be used as potential target genes for developing chilling-tolerant sorghum varieties.

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Section: Resultsmentioning

confidence: 90%

Rhythmic lipid and gene expression responses to chilling in panicoid grasses

Raju,

Zhang,

Mahboub

et al. 2023

Preprint

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“…Maize provides a valuable plant complement to Arabidopsis. Both maize, a monocot, and Arabidopsis, a eudicot, have made important contributions to biology, yet they have quite different body plans, seed development pathways, genome sizes and gene expression profiles, having diverged 200 MYA (Brendel et al, 2002;Conklin et al, 2018;Dukowic-Schulze et al, 2014;Wang et al, 2012;Zeng et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Identification and characterization of genes encoding the nuclear envelope LINC complex in the monocot speciesZea mays

Gumber

McKenna

Estrada

et al. 2019

Journal of Cell Science

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The LINC (Linker of Nucleoskeleton to Cytoskeleton) complex is an essential multi-protein structure spanning the nuclear envelope. It connects the cytoplasm to the nucleoplasm, functions to maintain nuclear shape and architecture, and regulates chromosome dynamics during cell division. Knowledge of LINC complex composition and function in the plant kingdom is primarily limited to Arabidopsis, but critically missing from the evolutionarily distant monocots which include grasses, the most important agronomic crops worldwide. To fill this knowledge gap, we identified and characterized 22 maize genes, including a new grass-specific KASH gene family. Using bioinformatic, biochemical, and cell biological approaches, we provide evidence that representative KASH candidates localize to the nuclear periphery and interact with ZmSUN2 in vivo. FRAP experiments using domain-deletion constructs verified that this SUN-KASH interaction was dependent on the SUN but not the coiled-coil domain of ZmSUN2. A summary working model is proposed for the entire maize LINC complex encoded by conserved and divergent gene families. These findings expand our knowledge of the plant nuclear envelope in a model grass species, with implications for both basic and applied cellular research.

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“…Despite the remarkable functional consequences of centromeric chromatin asymmetry, the causes of CenH3 rapid evolution remain unknown. The timescale of adaptive CenH3 evolution, detected by comparing two Arabidopsis species only 5 million years diverged (105), is much shorter than the divergence time between A. thaliana and Z. mays (>150 million years) (11). A hybrid system that captures the shorter timescale, like the asymmetrical centromeres from the M. musculus system described above, could provide the opportunity to test the hypothesis that rapidly oscillating centromere size or changes to the sequence itself imposes evolutionary pressure on CenH3 to alter its affinity.…”

Section: Centromere and Kinetochore Proteinsmentioning

confidence: 91%

Functional Diversification of Chromatin on Rapid Evolutionary Timescales

Brand

Levine

2021

Annu. Rev. Genet.

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Repeat-enriched genomic regions evolve rapidly and yet support strictly conserved functions like faithful chromosome transmission and the preservation of genome integrity. The leading resolution to this paradox is that DNA repeat–packaging proteins evolve adaptively to mitigate deleterious changes in DNA repeat copy number, sequence, and organization. Exciting new research has tested this model of coevolution by engineering evolutionary mismatches between adaptively evolving chromatin proteins of one species and the DNA repeats of a close relative. Here, we review these innovative evolution-guided functional analyses. The studies demonstrate that vital, chromatin-mediated cellular processes, including transposon suppression, faithful chromosome transmission, and chromosome retention depend on species-specific versions of chromatin proteins that package species-specific DNA repeats. In many cases, the ever-evolving repeats are selfish genetic elements, raising the possibility that chromatin is a battleground of intragenomic conflict.

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Untitled

Cited by 41 publications

References 29 publications

Rhythmic lipid and gene expression responses to chilling in panicoid grasses

Rhythmic lipid and gene expression responses to chilling in panicoid grasses

Identification and characterization of genes encoding the nuclear envelope LINC complex in the monocot speciesZea mays

Functional Diversification of Chromatin on Rapid Evolutionary Timescales

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