Inhibition of auxin transport and auxin signaling and treatment with far red light induces root coiling in the phospholipase-A mutant ppla-I-1. Significance for surface penetration?

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ID: 276609
2016
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Abstract
When grown on a non-penetretable at a surface angle of 45°, Arabidopsis roots form wave-like structures and, in wild type rarely, but in certain mutants the tip root even may form circles. These circles are called coils. The formation of coils depends on the complex interaction of circumnutation, gravitropism and negative thigmotropism where - at least - gravitropism is intimately linked to auxin transport and signaling. The knockout mutant of patatin-related phospholipase-AI-1 (pplaI-1) is an auxin-signaling mutant which forms moderately increased numbers of coils on tilted agar plates. We tested the effects of the auxin efflux transport inhibitor NPA (1-naphthylphtalamic acid) and of the influx transport inhibitor 1-NOA (1-naphthoxyacetic acid) which both further increased root coil formation. The pPLAI-1 inhibitors HELSS (haloenol lactone suicide substrate=E-6-(bromomethylene)tetrahydro-3-(1-naphthalenyl)-2H-pyran-2-one) and ETYA (eicosatetraynoic acid) which are auxin signaling inhibitors also increased coil formation. In addition, far red light treatment increased coil formation. The results point out that a disturbance of auxin transport and signaling is one potential cause for root coils. As we show that the mutant pplaI-1 penetrates horizontal agar plates better than wild type plants root movements may help penetrating the soil.
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Authors Perrineau, F;Wimalasekera, R;Effendi, Y;Scherer, G F E;
Journal Journal of plant physiology
Year 2016
DOI
10.1016/j.jplph.2016.03.010
URL
Keywords
red light 1-noa (1-naphthoxyacetic acid) 1-npa (1-naphthylphtalamic acid) 2-noa (2-naphthoxyacetic acid) etya (eicosatetraynoic acid) helss (haloenol lactone suicide substrate=e-6-(bromomethylene)tetrahydro-3-(1-naphthalenyl)-2h-pyran-2-one) pplai-1 (patatin-related phospholipase-ai-1)

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