Shaping leaf vein pattern by auxin and mechanical feedback
| Autor: | Wojtek Palubicki, Magdalena Raczyńska-Szajgin, Agata Burian |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0301 basic medicine Physiology vascular system Arabidopsis Plant Science Leaf water Biology eXtra Botany 01 natural sciences Insights Feedback 03 medical and health sciences Plant Growth Regulators Auxin Auxin biosynthesis chemistry.chemical_classification leaf Indoleacetic Acids Arabidopsis Proteins AcademicSubjects/SCI01210 fungi mechanical stress food and beverages Biological Transport Cell biology Plant Leaves 030104 developmental biology chemistry Efflux 010606 plant biology & botany |
| Zdroj: | Journal of Experimental Botany |
| ISSN: | 1460-2431 0022-0957 |
| Popis: | Our current understanding of vein development in leaves is based on canalization of the plant hormone auxin into self-reinforcing streams which determine the sites of vascular cell differentiation. By comparison, how auxin biosynthesis affects leaf vein patterning is less well understood. Here, after observing that inhibiting polar auxin transport rescues the sparse leaf vein phenotype in auxin biosynthesis mutants, we propose that the processes of auxin biosynthesis and cellular auxin efflux work in concert during vein development. By using computational modeling, we show that localized auxin maxima are able to interact with mechanical forces generated by the morphological constraints which are imposed during early primordium development. This interaction is able to explain four fundamental characteristics of midvein morphology in a growing leaf: (i) distal cell division; (ii) coordinated cell elongation; (iii) a midvein positioned in the center of the primordium; and (iv) a midvein which is distally branched. Domains of auxin biosynthetic enzyme expression are not positioned by auxin canalization, as they are observed before auxin efflux proteins polarize. This suggests that the site-specific accumulation of auxin, as regulated by the balanced action of cellular auxin efflux and local auxin biosynthesis, is crucial for leaf vein formation. |
| Databáze: | OpenAIRE |
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