Strength in numbers - An isoform variety of homogalacturonan-modifying enzymes may contribute to pollen tube fitness
Kamel H, Geitmann A (2023) Plant Physiology doi.org/10.1093/plphys/kiad544
Pollen tube growth involves extremely rapid assembly of new cell wall. The delivery, assembly, and modification of polysaccharides ensures cell shape maintenance. This update explores how the multitude of cell wall modifying enzymes might tune the process.
Pectate lyase-like lubricates the male gametophyte's path toward its mating partner
Chebli Y, Geitmann A (2023) Plant Physiology doi.org/10.1093/plphys/kiad481
To deliver their cargo, pollen tubes must invade the tissues of the flower pistil to reach a receptive ovule. We found that the pollen tube secretes a pectate lyase-like protein that may aid the tube by digesting the apoplast of the transmitting tissue.
Plant blindness and diversity in
AI language models
Geitmann A, Bidhendi AJ (2023) Trends in Plant Science doi.org/10.1016/j.tplants.2023.06.016
Does ChatGPT know that plants are biological organisms? We wanted to find out and scored the bot's answers to our queries on our highly scientific plant blindness barometer. Read the piece to see what this means for the scientific community.
Seeing clearly – Plant anatomy through Katherine Esau’s microscopy lens
Geitmann A (2023) Journal of Microscopy 291: 92-104
Katherine Esau was a phenomenal plant anatomist and her books are still used today, 70 years after their first publication. In this homage her beautiful drawings are placed side-by-side with modern micrographs highlighting recent progress in plant imaging.
Pollen tube invasive growth is promoted by callose
Karuna K, Geitmann A (2023) Plant Reproduction 36: 157-171
Pollen tubes, the delivery tool for the sperm cells in plants, are enriched in the cell wall component callose. This distinguishes them from most other plant cells. We investigated how callose supports the particular needs of the pollen tube: rapid and invasive growth.
Multiscale structural anisotropy steers plant organ actuation
Sleboda DAS, Geitmann A, Sharif-Naeini R (2023) Current Biology 33: 639–646
Plants move - sometimes astonishingly fast. We found out our differentials in hydrostatic pressure are converted to efficient leaf actuation through multiscale anisotropic stiffening in the pulvinus of Mimosa pudica.
3D Visualization of microtubules in epidermal pavement cells
Bidhendi AJ, Altartouri B, Geitmann A (2022) In: Hussey PJ, Wang P (eds), The Plant Cytoskeleton: Methods and Protocols, Series Methods in Molecular Biology, Springer, vol. 2604
Methods, tips and tricks to successfully label and image microtubules in plant cells.
Cannabis glandular trichomes: a cellular metabolite factory
Tanney CAS, Backer R, Geitmann A, Smith DL (2021) Frontiers in Plant Science 12:721986
Cannabis trichomes produce and enrich compounds including cannabinoids such as tetrahydro-cannabinolic acid. In this review we summarize the current understanding of glandular trichome function in cannabis and outline future research directions.
Mechanosensitive ion channels contribute to mechanically evoked rapid leaflet movement in Mimosa pudica
Tran D, Petitjean H, Chebli Y, Geitmann A, Sharif-Naeini R (2021) Plant Physiology, 187: 1705-1712
Mimosa is able to rapidly fold its leaves upon a mechanical trigger. We investigated the mechanism allowing the plant to perceive mechanical triggers and found a mechanosensitive ion channel to be involved. Highlighted in a News and Views Editorial.
Invasive processes in the life cycle of plants and fungi
Kapoor K, Geitmann A (2023) In: Jensen K, Forterre Y (eds) Soft Matter in Plants: From Biophysics to Biomimetics. Royal Society of Chemistry , 203-226
Plant cells such as pollen tubes, root hairs and fibers have the ability to invade substrates. Plants are also subject to invasion, for example by fungal hyphae. This review discusses the physics of the invasion process, the biological purpose and the underlying mechanism.
Microfluidics-based bioassays and imaging of plant cells
Yanagisawa N, Kozgunova E, Grossmann G, Geitmann A, Higashiyama T (2021) Plant and Cell Physiology, doi.org/10.1093/pcp/pcab067
The past decade has shown rapid adoption of microfluidics and MEMS-technology for research on tip growing cells. This article provides an overview of the nifty experimental designs and the challenges associated with this approach.
Cytoskeletal regulation of primary plant cell wall assembly
Chebli Y, Bidhendi AJ, Kapoor K, Geitmann A. (2021) Current Biology 31: R681-R695
The plant cell wall is assembled upon cell division and growth. The regulation of the delivery of cell wall components and of the assembly process proper relies with the cytoskeleton. In this review we summarize how this happens
Live imaging of cellulose and pectin in walls of growing plant cells
Bidhendi AJ, Chebli Y, Geitmann A. (2021) Bulletin of the Microscopical Society of Canada 47(1): 14-17
Labeling polysaccharides in the living plant without interference with development and morphogenesis requires carefully adapted techniques. A summary of methods is provided in this Conference Proceeding, related to a full paper published in J Microscopy.
Biomechanics of hair fibre growth:
a multi-scale modeling approach
Zamil MS, Harland DP, Fisher BK, Davis MG, Schwartz JR, Geitmann A. (2021) Journal of the Mechanics and Physics of Solids 148: 104290
We used finite element modeling to simulate the hair growth process and identify the forces that enables follicles to push the growing hair outside of the skin. We identified the structures that enable a hair fibre to emerge from the skin. More...