Abstract
The presence of an auxin gradient in the Arabidopsis root is crucial for proper root development and importantly, for stem cell niche (SCN) maintenance. Subsequently, developmental pathways in the root SCN regulate the formation of the auxin gradient. Combinations of experimental data and computational modeling enable the identification of pathways involved in establishing and maintaining the auxin gradient. We describe how the predictive power of these computational models is used to find how genes and their interactions tightly control the formation of an auxin maximum in the SCN. In addition, we highlight known connections between signaling pathways involving auxin and controlling patterning and development in Arabidopsis.
Highlights
Hormones are a crucial component of plant developmental pathways, affecting processes such as embryogenesis, growth, organ size, and stress response (Wolters and Jurgens, 2009)
We describe how the predictive power of these computational models is used to find how genes and their interactions tightly control the formation of an auxin maximum in the stem cell niche (SCN)
In Arabidopsis, most auxin biosynthesis occurs in tryptophan-dependent pathways, other pathways have been discovered
Summary
Hormones are a crucial component of plant developmental pathways, affecting processes such as embryogenesis, growth, organ size, and stress response (Wolters and Jurgens, 2009). This polar auxin transport results in a gradient of auxin from the shoot with a maximum in the root SCN. The auxin maximum in the QC depends on AUX1 expression in the lateral root cap and not on the specific PIN localization in the epidermis (Band et al, 2014).
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