Interaction between benzyladenine and fusicoccin on the development of excised watermelon cotyledons. II. Correlation between growth and proton extrusion

Fantelli, Raffaella; Longo, Giovanna P.; Rossi, G.; Longo, Claudio P.; Magnoni, Laura

doi:10.1016/0304-4211(84)90018-x

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…The effects of BR and of B A on H*-secretion (measured as decrease of pH in the weakly buffered incubation medium) are shown in Rg, 4. ITie effects of two concentrations of FC, a phytotoxin which stimulates growth by cell expansion of isolated cotyledons, and of various other tissues, by activating electrogenic H*-extrusion (Marre et al, 1974a, Marre 1979, Ross and Rayie 1982, Fantelli et a!. 1984, are also shown for comparison.…”

Section: Effectmentioning

confidence: 99%

Effects of a brassinosteroid on growth and on H⁺‐extrusion in isolated radish cotyledons: comparison with the effects of benzyladenine

Michelis¹,

Lado²

1986

Physiologia Plantarum

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We investigated the effect of 24‐epibrassinolide (BR) on the cytokinin‐bioassay based on growth of isolated radish (Raphanus sativus L. cv. Tondo Rosso Quarantino) cotyledons. BR stimulated growth of the cotyledons by about 50% when applied at saturating concentrations (3 μM). This effect was much lower than that of saturating concentrations of benzyladenine (BA) which was about 150% at 10 μM BA. The effects of saturating concentrations of BR and BA were additive. BR, but not BA, stimulated H+‐secretion by the cotyledons (measured as acidification of the incubation medium) slightly but reproducibly. These results indicate that the modes of action of the two phytoregulators are at least partially different. BR‐induced stimulation of H+‐secretion was of similar amplitude to that induced by a concentration of fusicoccin (30 nM) such as to stimulate growth to the same extent as BR. These results suggest that BR‐induced stimulation of radish cotyledon growth might depend, at least in part, on BR‐induced acidification of the wall space, similar to that observed on Azuki bean epicotyls and maize roots.

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Section: Effectmentioning

confidence: 99%

Effects of a brassinosteroid on growth and on H⁺‐extrusion in isolated radish cotyledons: comparison with the effects of benzyladenine

Michelis¹,

Lado²

1986

Physiologia Plantarum

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Role of acid efflux during growth promotion of primary leaves of Phaseolus vulgaris L. by hormones and light

Brock

Cleland

1989

Planta

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The white-light-(WL) induced enlargement of dicotyledonous leaf cells is known to occur via an acid-growth mechanism; i.e., WL causes leaf cells to excrete protons which lead to an increase in wall extensibility and thus cell enlargement. Gibberellic acid (GA3) and N(6)-benzyladenine (BA) also induce leaf cell enlargement. To see if they also act via acid-induced cell wall loosening, a comparison has been made of WL-, GA3-and BA-induced growth of strips, taken from primary leaves of bean (Phaseolus vulgaris L.) plants raised in continuous red light for 10 d. White light, GA3 and BA all increased wall extensibility as measured by the Instron technique, and this change preceded the increase in growth rate. However, whereas WL induced significant proton excretion, neither GA3 nor BA caused any acidification of the apoplast. Furthermore, neutral buffers, which effectively inhibited the growth induced by WL, were without effect on growth promoted by either GA3 or BA. These results indicate that while WL, GA3 and BA all initiate growth in bean leaves by altering cell-wall properties, GA3 and BA do so through some wall loosening mechanism other than wall acidification. Neither gibberellin nor cytokinin is likely to play a major role in light-induced cell enlargement of dicotyledonous leaves.

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Growth Regulators: An Account of Hormones and Growth Regulation

Brock¹,

Kaufman²

1991

Plant Physiology

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Interaction between benzyladenine and fusicoccin on the development of excised watermelon cotyledons. II. Correlation between growth and proton extrusion

Cited by 5 publications

References 9 publications

Effects of a brassinosteroid on growth and on H⁺‐extrusion in isolated radish cotyledons: comparison with the effects of benzyladenine

Effects of a brassinosteroid on growth and on H⁺‐extrusion in isolated radish cotyledons: comparison with the effects of benzyladenine

Role of acid efflux during growth promotion of primary leaves of Phaseolus vulgaris L. by hormones and light

Growth Regulators: An Account of Hormones and Growth Regulation

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Interaction between benzyladenine and fusicoccin on the development of excised watermelon cotyledons. II. Correlation between growth and proton extrusion

Cited by 5 publications

References 9 publications

Effects of a brassinosteroid on growth and on H+‐extrusion in isolated radish cotyledons: comparison with the effects of benzyladenine

Effects of a brassinosteroid on growth and on H+‐extrusion in isolated radish cotyledons: comparison with the effects of benzyladenine

Role of acid efflux during growth promotion of primary leaves of Phaseolus vulgaris L. by hormones and light

Growth Regulators: An Account of Hormones and Growth Regulation

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Effects of a brassinosteroid on growth and on H⁺‐extrusion in isolated radish cotyledons: comparison with the effects of benzyladenine

Effects of a brassinosteroid on growth and on H⁺‐extrusion in isolated radish cotyledons: comparison with the effects of benzyladenine