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Titolo:
DIM-RED-LIGHT-INDUCED INCREASE IN POLAR AUXIN TRANSPORT IN CUCUMBER SEEDLINGS - I - DEVELOPMENT OF ALTERED CAPACITY, VELOCITY, AND RESPONSETO INHIBITORS
Autore:
SHINKLE JR; KADAKIA R; JONES AM;
Indirizzi:
TRINITY UNIV,DEPT BIOL SAN ANTONIO TX 78212 UNIV N CAROLINA,DEPT BIOL CHAPEL HILL NC 27599
Titolo Testata:
Plant physiology
fascicolo: 4, volume: 116, anno: 1998,
pagine: 1505 - 1513
SICI:
0032-0889(1998)116:4<1505:DIIPAT>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
L HYPOCOTYL SEGMENTS; NET IAA UPTAKE; STEM ELONGATION; BLUE-LIGHT; BINDING; ACID; PROTEIN; GROWTH; ARABIDOPSIS; ETHYLENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
J.R. Shinkle et al., "DIM-RED-LIGHT-INDUCED INCREASE IN POLAR AUXIN TRANSPORT IN CUCUMBER SEEDLINGS - I - DEVELOPMENT OF ALTERED CAPACITY, VELOCITY, AND RESPONSETO INHIBITORS", Plant physiology, 116(4), 1998, pp. 1505-1513

Abstract

We have developed and characterized a system to analyze light effectson auxin transport independent of photosynthetic effects. Polar transport of [H-3]indole-3-acetic acid through hypocotyl segments from etiolated cucumber (Cucumis sativus L.) seedlings was increased in seedlings grown in dim-red light (DRL) (0.5 mu mol m(-2) s(-1)) relative to seedlings grown in darkness. Both transport velocity and transport intensity (export rate) were increased by at least a fatter of 2. Tissue formed in DRL completely acquired the higher transport capacity within 50 h, but tissue already differentiated in darkness acquired only a partial increase in transport capacity within 50 h of DRL, indicating a developmental window for light induction of commitment to changes in auxin transport. This light-induced change probably manifests itself byalteration of function of the auxin efflux carrier, as revealed usingspecific transport inhibitors. Relative to dark controls, DRL-grown seedlings were differentially less sensitive to two inhibitors of polarauxin transport, N-(naphth-1-yl) phthalamic acid and 2,3,5-trrioodobenzoic acid. On the basis of these data, we propose that the auxin efflux carrier is a key target of light regulation during photomorphogenesis.

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Documento generato il 25/09/20 alle ore 06:45:10