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Titolo:
RESPONSE OF CYTOKININ CONCENTRATION IN THE XYLEM EXUDATE OF BEAN (PHASEOLUS-VULGARIS L) PLANTS TO DECAPITATION AND AUXIN TREATMENT, AND RELATIONSHIP TO APICAL DOMINANCE
Autore:
BANGERTH F;
Indirizzi:
UNIV HOHENHEIM,INST OBST GEMUSE & WEINBAU D-70593 STUTTGART GERMANY
Titolo Testata:
Planta
fascicolo: 3, volume: 194, anno: 1994,
pagine: 439 - 442
SICI:
0032-0935(1994)194:3<439:ROCCIT>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Keywords:
APICAL DOMINANCE; AUXIN/CYTOKININ INTERACTIONS; PHASEOLUS; XYLEM EXUDATE;
Tipo documento:
Note
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
F. Bangerth, "RESPONSE OF CYTOKININ CONCENTRATION IN THE XYLEM EXUDATE OF BEAN (PHASEOLUS-VULGARIS L) PLANTS TO DECAPITATION AND AUXIN TREATMENT, AND RELATIONSHIP TO APICAL DOMINANCE", Planta, 194(3), 1994, pp. 439-442

Abstract

When xylem exudate of previously untreated Phaseolus vulgaris plants was analysed for cytokinins by radioimmunoassay, a low concentration (about 5 ng.ml(-1)) was found. However, when the plants were decapitated about 16 h before the xylem exudate was collected, an almost 25-foldincrease in cytokinin concentration was observed. Twenty-four hours after decapitation this increase even reached 4000% compared to controlplants. Applying naphthaleneacetic acid (NAA) to the shoot of decapitated plants almost eliminated the effect of shoot tip removal on cytokinin concentration, suggesting that cytokinins in the xylem exudate ofintact plants are under the control of the polar auxin transport system. Other xylem constituents, such as potassium or free amino acids did not show this strong increase after decapitation and did not respondto NAA application. It is concluded that the observed auxin/cytokinininteraction has an important regulatory role to play, not only in apical dominance but in many other correlative events as well.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 13:46:16