Abstract:
:The phytohormone auxin is a vital growth regulator in plants. In the root epidermis auxin steers root organ growth. However, the mechanisms that allow adjacent tissues to integrate growth are largely unknown. Here, the focus is on neighbouring epidermal root tissues to assess the integration of auxin-related growth responses. The pharmacologic, genetic, and live-cell imaging approaches reveal that PIN2 auxin efflux carriers are differentially controlled in tricho- and atrichoblast cells. PIN2 proteins show lower abundance at the plasma membrane of trichoblast cells, despite showing higher rates of intracellular trafficking in these cells. The data suggest that PIN2 proteins display distinct cell-type-dependent trafficking rates to the lytic vacuole for degradation. Based on this insight, it is hypothesized that auxin-dependent processes are distinct in tricho- and atrichoblast cells. Moreover, genetic interference with epidermal patterning supports this assumption and suggests that tricho- and atrichoblasts have distinct importance for auxin-sensitive root growth and gravitropic responses.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Löfke C,Scheuring D,Dünser K,Schöller M,Luschnig C,Kleine-Vehn Jdoi
10.1093/jxb/erv282subject
Has Abstractpub_date
2015-08-01 00:00:00pages
5103-12issue
16eissn
0022-0957issn
1460-2431pii
erv282journal_volume
66pub_type
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