The auxin influx carrier LAX3 promotes lateral root emergence

• Lateral roots originate deep within the parental root from a small number of founder cells at the periphery of vascular tissues and must emerge through intervening layers of tissues. We describe how the hormone auxin, which originates from the developing lateral root, acts as a local inductive signal which re-programmes adjacent cells. Auxin induces the expression of a previously uncharacterized auxin influx carrier LAX3 in cortical and epidermal cells directly overlaying new primordia. Increased LAX3 activity reinforces the auxin-dependent induction of a selection of cell-wall-remodelling enzymes, which are likely to promote cell separation in advance of developing lateral root primordia.

Subject headings

NATURVETENSKAP  -- Biologi -- Cellbiologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Cell Biology (hsv//eng)

Keyword

Arabidopsis

Arabidopsis Proteins/*physiology

Carrier Proteins/genetics/*physiology

Gene Expression Regulation; Plant

Indoleacetic Acids/*pharmacology

Membrane Transport Proteins/*physiology

Plant Growth Regulators/pharmacology

Plant Roots/cytology/*growth & development

Publication and Content Type

ref (subject category)

art (subject category)