Quantitative Relationship between Various Growth Substances and Bud Production in <i>Funaria hygrometrica</i>. A bioassay for abscisic acid

Valadon, L. R. G.; Mummery, Rosemary S.

doi:10.1111/j.1399-3054.1971.tb03484.x

Cited by 25 publications

(16 citation statements)

References 8 publications

(2 reference statements)

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“…The experiments reported in this paper result in a greatly improved understanding of the inhibition of bud formation in moss by ABA first reported by Valadon and Mummery (1971). The inhibitory effect is not a result of some interference with the initial perception of cytokinin.…”

Section: Aba and The Second Cytokinin-mediated Event In Budmentioning

confidence: 54%

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ABA prevents the second cytokinin‐mediated event during the induction of shoot buds in the moss Funaria hygrometrica

Christianson

2000

American J of Botany

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The induction of shoot buds in the moss Funaria hygrometrica is a classic and quantitative bioassay for cytokinin. This cytokinin-stimulated response can be inhibited by the plant hormone abscisic acid, ABA; the inhibition is concentration dependent and was proposed for use as a bioassay for ABA. This paper characterizes the ABA inhibition of the cytokinin-stimulated formation of shoot buds. Experiments transferring protonema between cytokinin and cytokinin plus ABA show that ABA does not interfere with the initial perception of cytokinin. Other experiments compare the results of transferring protonema from cytokinin to cytokinin-free medium or to medium with cytokinin plus ABA and reveal that ABA acts by blocking the cytokinin-mediated stable commitment of nascent buds. Extension of the technique of double-reciprocal plots to this whole-organism bioassay finds that ABA is not a competitive inhibitor of cytokinin. Analysis of the ABA inhibition of bud formation identifies a new regulatory step in the developmental process of bud formation in mosses.

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Section: Aba and The Second Cytokinin-mediated Event In Budmentioning

confidence: 54%

“…Exposure to most cytokinins results in log-linear dose-dependent increases in bud number. Stimulation of bud formation can usually be detected at concentrations of ϳ10 Ϫ8 mol/L, and maximal numbers of buds result from exposures to optimal concentrations, usually ϳ10 Ϫ6 mol/L (Brandes and Kende, 1968;Hahn and Bopp, 1968;Valadon and Mummery, 1971).…”

mentioning

confidence: 99%

ABA prevents the second cytokinin‐mediated event during the induction of shoot buds in the moss Funaria hygrometrica

Christianson

2000

American J of Botany

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“…Antagonistic relationship between cytokinin and ABA was demonstrated in an earlier study where application of abscisic acid inhibited the cytokinin-stimulated formation of buds in the moss Funaria hygrometrica (Valadon and Mummery 1971). The induction of shoot buds in the moss Funaria hygrometrica is a classic quantitative bioassay for cytokinins.…”

Section: Introductionmentioning

confidence: 93%

Response of cytokinin pool and cytokinin oxidase/dehydrogenase activity to abscisic acid exhibits organ specificity in peas

et al. 2007

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Changes in cytokinin pool and cytokinin oxidase/dehydrogenase activity (CKX EC: 1.5.99.12) in response to increasing abscisic acid (ABA) concentrations (0.5-10 lM) were assessed in the last fully expanded leaves and secondary roots of two pea (Pisum sativum) varieties with different vegetation periods. Certain organ diversity in CKX response to exogenous ABA was observed. Treatment provoked altered cytokinin pool in the aboveground parts of both studied cultivars. Specific CKX activity was influenced significantly basically in roots of the treated plants. Results suggest that ABA-mediated cytokinin pool changes are leaf-specific and involve certain root signals in which CKX activity presents an important link. This enzymatic activity most probably regulates vascular transport of active cytokinins from roots to shoots.

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“…Exogenous ABA also inhibits protonemal differentiation to a 'leafy' gametophore. It has been shown that bud formation for the gametophore of Funaria hygrometrica (Valadon and Mummery 1971) and Timmiella anomala (Chopra and Kapur 1989) is inhibited by ABA. This is probably due to the effect of ABA in counteraction with the bud-promoting action of cytokinin (Christianson 2000).…”

Section: Bryophytes and Abamentioning

confidence: 99%

ABA in bryophytes: how a universal growth regulator in life became a plant hormone?

2011

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Abscisic acid (ABA) is not a plant-specific compound but one found in organisms across kingdoms from bacteria to animals, suggesting that it is a ubiquitous and versatile substance that can modulate physiological functions of various organisms. Recent studies have shown that plants developed an elegant system for ABA sensing and early signal transduction mechanisms to modulate responses to environmental stresses for survival in terrestrial conditions. ABA-induced increase in stress tolerance has been reported not only in vascular plants but also in non-vascular bryophytes. Since bryophytes are the key group of organisms in the context of plant evolution, clarification of their ABA-dependent processes is important for understanding evolutionary adaptation of land plants. Molecular approaches using Physcomitrella patens have revealed that ABA plays a role in dehydration stress tolerance in mosses, which comprise a major group of bryophytes. Furthermore, we recently reported that signaling machinery for ABA responses is also conserved in liverworts, representing the most basal members of extant land plant lineage. Conservation of the mechanism for ABA sensing and responses in angiosperms and basal land plants suggests that acquisition of this mechanism for stress tolerance in vegetative tissues was one of the critical evolutionary events for adaptation to the land. This review describes the role of ABA in basal land plants as well as non-land plant organisms and further elaborates on recent progress in molecular studies of model bryophytes by comparative and functional genomic approaches.

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Quantitative Relationship between Various Growth Substances and Bud Production in Funaria hygrometrica. A bioassay for abscisic acid

Cited by 25 publications

References 8 publications

ABA prevents the second cytokinin‐mediated event during the induction of shoot buds in the moss Funaria hygrometrica

ABA prevents the second cytokinin‐mediated event during the induction of shoot buds in the moss Funaria hygrometrica

Response of cytokinin pool and cytokinin oxidase/dehydrogenase activity to abscisic acid exhibits organ specificity in peas

ABA in bryophytes: how a universal growth regulator in life became a plant hormone?

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