Ethylene accelerates the breakdown of cytokinins and thereby stimulates rooting in Norway spruce hypocotyl cuttings

Bollmark, Marie; Eliasson, Lennart

doi:10.1111/j.1399-3054.1990.tb05675.x

Cited by 57 publications

(26 citation statements)

References 22 publications

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“…For instance, ethylene inhibited adventitious root formation in pea (Pisum sativum) cuttings (Nordström and Eliasson, 1984) and Prunus avium explants (Biondi et al, 1990), whereas it stimulated root initiation in cuttings of Picea abies (Bollmark and Eliasson, 1990). Also, experimental conditions seem to matter, as contrasting results were found in various studies on mung bean (Vigna radiata -e.g., Robbins et al, 1983 vs. Geneve andHeuser, 1983).…”

Section: Involvement Of Ethylenementioning

confidence: 56%

Acclimation to soil flooding — sensing and signal-transduction

Visser

Voesenek

2005

Plant Ecophysiology

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Flooding results in major changes in the soil environment. The slow diffusion rate of gases in water limits the oxygen supply, which affects aerobic root respiration as well as many (bio)geochemical processes in the soil. Plants from habitats subject to flooding have developed several ways to acclimate to these growth-inhibiting conditions, ranging from pathways that enable anaerobic metabolism to specific morphological and anatomical structures that prevent oxygen shortage. In order to acclimate in a timely manner, it is crucial that a flooding event is accurately sensed by the plant. Sensing may largely occur in two ways: by the decrease of oxygen concentration, and by an increase in ethylene. Although ethylene sensing is now well understood, progress in unraveling the sensing of oxygen has been made only recently. With respect to the signal-transduction pathways, two types of acclimation have received most attention. Aerenchyma formation, to promote gas diffusion through the roots, seems largely under control of ethylene, whereas adventitious root development appears to be induced by an interaction between ethylene and auxin. Parts of these pathways have been described for a range of species, but a complete overview is not yet available. The use of molecular-genetic approaches may fill the gaps in our knowledge, but a lack of suitable model species may hamper further progress.

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Section: Involvement Of Ethylenementioning

confidence: 56%

Acclimation to soil flooding — sensing and signal-transduction

Visser

Voesenek

2005

Plant Ecophysiology

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“…These promoting effects of auxin and ethylene are commonly found with respect to adventitious root formation in soft-and hard-wooded cuttings (e.g. Gurumurti, Gupta and Kumar, 1985;Robbins et al, 1985;Bollmark and Eliasson, 1990;Nordstrom and Eliasson, 1991;Selby, Kennedy and Harvey, 1992).…”

Section: Discussionmentioning

confidence: 99%

Physiological Ecology of Riverside Species: Adaptive Responses of Plants to Submergence

Blom

1994

Annals of Botany

149

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In river floodplains, variation in flooding conditions results in successional stages in colonization ranging from annual pioneers to long-lived perennials. Reactions to submergence of species from the mid-successional zone are compared with adaptive responses of species from other zones. Presence and abundance are related to elevation and can be explained by characteristics of biomass production, and recovery in response to various submergence intensities.Rume.x species, from early to late successional stages, serve as models to elucidate, in more detail, mechanisms of adaptation. Flooding-resistant species develop large numbers of adventitious roots upon submergence and exposure to low oxygen conditions. Due to internal oxygen transport through aerenchyma, soil around these roots is re oxidized, which stimulates bacterial nitrification. Ethylene and auxin promote adventitious rooting. Increased petiole elongation is also an adaptive feature of submergence-resistant Rume.x species. Differences between species in submergence-induced growth are not only controlled by variation in endogenous levels of ethylene but also by different sensitivities to this hormone. Auxin does not affect Rume.x petiole elongation, but a clear positive effect of gibberellin is demonstrated. Apparently, submergence induces a higher sensitivity to gibberellin and ethylene in the petioles of flooding-resistant Rume.x. Many of the submergence reactions can also be induced by restricting the oxygen supply, suggesting that low-oxygen might be a triggering factor. The Rume.x species we study represent various distinct communities. Thus, the ecophysiological phenomena observed in these model plants may explain processes and patterns in other species too and thus are interpretable at the riverside community level.

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“…and Douglas fir. On the other hand, Bollmark and Eliasson (1990) concluded that the enhanced rooting of Norway spruce (P. abies) hypocotyl cuttings, promoted by the treatment with ACC or Ethrel, was attributed to the ethylene-mediated acceleration of the breakdown of cytokinins.…”

Section: Ethylenementioning

confidence: 99%

Adventitious rooting of conifers: influence of physical and chemical factors

Ragonezi

Klimaszewska

Castro

et al. 2010

Trees

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In conifers, vegetative propagation of superior genotypes is the most direct means for making large genetic gains, because it allows a large proportion of genetic diversity to be captured in a single cycle of selection. There are two aims of vegetative propagation, namely large-scale multiplication of select genotypes and production of large numbers of plants from scarce and costly seed that originates from controlled seed orchard pollinations. This can be achieved, in some species, either through rooted cuttings or rooted microshoots, the latter regenerated through tissue culture in vitro. Thus far, both strategies have been used but often achieved limited success mainly because of difficult and inefficient rooting process. In this overview of technology, we focus on the progress in defining the physical and chemical factors that help the conifer cuttings and microshoots to develop adventitious roots. These factors include plant growth regulators, carbohydrates, light quality, temperature and rooting substrates/media as major variables for development of reliable adventitious rooting protocols for different conifer species.

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Ethylene accelerates the breakdown of cytokinins and thereby stimulates rooting in Norway spruce hypocotyl cuttings

Cited by 57 publications

References 22 publications

Acclimation to soil flooding — sensing and signal-transduction

Acclimation to soil flooding — sensing and signal-transduction

Physiological Ecology of Riverside Species: Adaptive Responses of Plants to Submergence

Adventitious rooting of conifers: influence of physical and chemical factors

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