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Titolo:
THE DIAGEOTROPICA GENE DIFFERENTIALLY AFFECTS AUXIN AND CYTOKININ RESPONSES THROUGHOUT DEVELOPMENT IN TOMATO
Autore:
COENEN C; LOMAX TL;
Indirizzi:
OREGON STATE UNIV,DEPT BOT & PLANT PATHOL CORVALLIS OR 97331 OREGON STATE UNIV,DEPT BOT & PLANT PATHOL CORVALLIS OR 97331 OREGON STATE UNIV,CTR GENE RES & BIOTECHNOL CORVALLIS OR 97331
Titolo Testata:
Plant physiology
fascicolo: 1, volume: 117, anno: 1998,
pagine: 63 - 72
SICI:
0032-0889(1998)117:1<63:TDGDAA>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
LYCOPERSICON-ESCULENTUM MILL; LATERAL ROOT INITIATION; NICOTIANA-PLUMBAGINIFOLIA; HYPOCOTYL ELONGATION; MUTANT DIAGEOTROPICA; ARABIDOPSIS CONFERS; ETHYLENE; GROWTH; SEEDLINGS; RESISTANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
C. Coenen e T.L. Lomax, "THE DIAGEOTROPICA GENE DIFFERENTIALLY AFFECTS AUXIN AND CYTOKININ RESPONSES THROUGHOUT DEVELOPMENT IN TOMATO", Plant physiology, 117(1), 1998, pp. 63-72

Abstract

The interactions between the plant hormones auxin and cytokinin throughout plant development are complex, and genetic investigations of theinterdependency of auxin and cytokinin signaling have been limited. We have characterized the cytokinin sensitivity of the auxin-resistant diageotropica (dgt) mutant of tomato (Lycopersicon esculentum Mill.) in a range of auxin-and cytokinin-regulated responses. Intact, etiolated dgt seedlings showed cross-resistance to cytokinin with respect to root elongation, but cytokinin effects on hypocotyl growth and ethylenesynthesis in these seedlings were not impaired by the dgt mutation. Seven-week-old, green wild-type and dgt plants were also equally sensitive to cytokinin with respect to shoot growth and hypocotyl and internode elongation. The effects of cytokinin and the dgt mutation on theseprocesses appeared additive. In tissue culture organ regeneration from dgt hypocotyl explants showed reduced sensitivity to auxin but normal sensitivity to cytokinin, and the effects of cytokinin and the mutation were again additive. However, although callus induction from dgt hypocotyl explants required auxin and cytokinin, dgt calli did not showthe typical concentration-dependent stimulation of growth by either auxin or cytokinin observed in wild-type calli. Cross-resistance of thedgt mutant to cytokinin thus was found to be limited to a small subset of auxin- and cytokinin-regulated growth processes affected by the dgt mutation, indicating that auxin and cytokinin regulate plant growththrough both shared and separate signaling pathways.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 09:43:16