AI Article Synopsis
- Plant organs, particularly leaves in Arabidopsis and tomato, develop various shapes primarily through directional cell growth and division, forming flat surfaces called laminae.* -
- The study shows that leaf shape is influenced by the deposition of cellulose along specific stress orientations, particularly in the internal cell walls along the adaxial-abaxial axis.* -
- This process is driven by mechanical feedback and is linked to genes that regulate organ polarity and the shape of leaf margins, enhancing the leaf's flatness.*
Article Abstract
Plant organs can adopt a wide range of shapes, resulting from highly directional cell growth and divisions. We focus here on leaves and leaf-like organs in Arabidopsis and tomato, characterized by the formation of thin, flat laminae. Combining experimental approaches with 3D mechanical modeling, we provide evidence that leaf shape depends on cortical microtubule mediated cellulose deposition along the main predicted stress orientations, in particular, along the adaxial-abaxial axis in internal cell walls. This behavior can be explained by a mechanical feedback and has the potential to sustain and even amplify a preexisting degree of flatness, which in turn depends on genes involved in the control of organ polarity and leaf margin formation.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7575199 | PMC |
| http://dx.doi.org/10.1016/j.cub.2020.07.076 | DOI Listing |
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