Abstract
This article comments on: Kneuper I, Teale W, Dawson JE, Tsugeki R, Katifori E, Palme K, Ditengou FA. 2021. Auxin biosynthesis and cellular efflux act together to regulate leaf vein patterning. Journal of Experimental Botany 72, 1151–1165.
Highlights
The distribution of auxin in tissues depends on several physiological processes including auxin biosynthesis and transport
By using empirical data and theoretical analysis, Kneuper et al (2021) explored a role for these processes in the establishment of leaf vasculature in Arabidopsis. They propose that the formation of early vein patterns may essentially be described in terms of auxin biosynthesis, its transport, and growth-dependent mechanical feedback from surrounding tissues
Multicellular organisms need an integrative system enabling fast and effective transport of substances and communication between distant parts of their body.This function is fulfilled by the vascular system, the formation of which is strictly related to the developmental programme of each organ
Summary
By using empirical data and theoretical analysis, Kneuper et al (2021) explored a role for these processes in the establishment of leaf vasculature in Arabidopsis They propose that the formation of early vein patterns may essentially be described in terms of auxin biosynthesis, its transport, and growth-dependent mechanical feedback from surrounding tissues. Testing interactions between auxin transport and biosynthesis, Kneuper et al (2021) found that an abnormal vein pattern which is formed due to genetic or chemical reduction of auxin biosynthesis can be rescued by NPA-induced reduction of polar auxin transport (Box 1).This implies that reduced auxin production can be compensated by reducing auxin efflux This compensation seems to be specific for vein patterning, but not for other auxin-dependent processes, such as leaf growth (Kneuper et al, 2021) or organogenesis (Cheng et al, 2007). They proposed that vein formation depends on the relative strengths of these two processes
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