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

Christianson, Michael L.

doi:10.2307/2656880

Cited by 32 publications

(18 citation statements)

References 28 publications

(64 reference statements)

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“…Abscisic acid treatment inhibits the precocious germination of somatic embryos and reduces secondary embryo formation (Choi and Jeong 2002;García-Martín et al 2005). In the moss Funaria hygrometrica, adventitious shoot formation is inhibited by ABA (Christianson 2000). Temporary pretreatment of ABA stimulated adventitious shoot proliferation in sesame.…”

Section: Resultsmentioning

confidence: 99%

High-frequency plant regeneration via adventitious shoot formation from deembryonated cotyledon explants of Sesamum indicum L.

Seo

Kim

Park

et al. 2007

In Vitro Cell.Dev.Biol.-Plant

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Sesamum indicum L. was used as an important oil crop in the world. An efficient protocol for in vitro plant regeneration via adventitious shoot formation from deembryonated cotyledon explants isolated from mature seeds of sesame is developed. Optimal medium for direct adventitious shoot formation was Murashige and Skoog (MS) medium with 22.2 μM 6-benzylaminopurin (BA) and 5.7 μM indole-3-acetic acid (IAA). Abscisic acid (3.8 μM ABA) and AgNO 3 (29.4 μM) were effective in enhancing the frequency of adventitious shoot formation. Preculture of cotyledon explants on high sucrose concentration (6-9%) for 2 wk and subsequent transfer to 3% sucrose enhanced the frequency of adventitious shoot induction. Root formation from the adventitious shoots was easily achieved on MS medium containing 2.7 μM of !-naphthalene acetic acid (NAA). Regenerated plantlets were acclimatized on sand and peat moss (1:1), showing 95% survival with subsequent flowering and seed set. We established the high-frequency plant regeneration via adventitious shoot formation in S. indicum L.

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Section: Resultsmentioning

confidence: 99%

High-frequency plant regeneration via adventitious shoot formation from deembryonated cotyledon explants of Sesamum indicum L.

Seo

Kim

Park

et al. 2007

In Vitro Cell.Dev.Biol.-Plant

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“…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). Furthermore, ABA inhibited formation of gametangia in the moss Bryum argenteum and Microdus brasiliensis at high concentrations (Bhatla and Chopra 1981;Chopra and Mehta 1987).…”

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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“…The induction of shoot buds in the moss Funaria hygrometrica is a classic quantitative bioassay for cytokinins. Later Christianson (2000) localized the inhibitory action of ABA to a particular time in the process of bud formation. Experiments transferring protonema between cytokinin and cytokinin plus ABA show that ABA does not interfere with the initial perception of cytokinin.…”

Section: Introductionmentioning

confidence: 99%

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

Cited by 32 publications

References 28 publications

High-frequency plant regeneration via adventitious shoot formation from deembryonated cotyledon explants of Sesamum indicum L.

High-frequency plant regeneration via adventitious shoot formation from deembryonated cotyledon explants of Sesamum indicum L.

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

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

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