Effects of internal and external cytokinin concentrations on root growth and shoot to root ratio of Plantago major ssp pleiosperma at different nutrient conditions

Kuiper, Daan; Schuit, Jacqueline; Kuiper, P. J. C.

doi:10.1007/978-94-009-0891-8_34

Cited by 53 publications

(49 citation statements)

References 14 publications

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“…5). Such a restricted role of cytokinins in Pi-starvation signaling is in conflict with reports associating the increase of the root-to-shoot growth ratio of plants during Pi starvation with the observed reduction of cytokinin signaling under these conditions (Kuiper, 1988;Kuiper et al, 1988). In addition, it is plausible that senescence, a Pi-mobilizing condition that can be stimulated by Pi starvation, involves reduced cytokinin signaling.…”

Section: Cytokinin Interactions With Sugar and Pi-starvation Signalingmentioning

confidence: 79%

Interaction between Phosphate-Starvation, Sugar, and Cytokinin Signaling in Arabidopsis and the Roles of Cytokinin Receptors CRE1/AHK4 and AHK3

et al. 2005

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Cytokinins control key processes during plant growth and development, and cytokinin receptors CYTOKININ RESPONSE 1/WOODEN LEG/ARABIDOPSIS HISTIDINE KINASE 4 (CRE1/WOL/AHK4), AHK2, and AHK3 have been shown to play a crucial role in this control. The involvement of cytokinins in signaling the status of several nutrients, such as sugar, nitrogen, sulfur, and phosphate (Pi), has also been highlighted, although the full physiological relevance of this role remains unclear. To gain further insights into this aspect of cytokinin action, we characterized a mutant with reduced sensitivity to cytokinin repression of a Pi starvation-responsive reporter gene and show it corresponds to AHK3. As expected, ahk3 displayed reduced responsiveness to cytokinin in callus proliferation and plant growth assays. In addition, ahk3 showed reduced cytokinin repression of several Pi starvation-responsive genes and increased sucrose sensitivity. These effects of the ahk3 mutation were especially evident in combination with the cre1 mutation, indicating partial functional redundancy between these receptors. We examined the effect of these mutations on Pi-starvation responses and found that the double mutant is not significantly affected in long-distance systemic repression of these responses. Remarkably, we found that expression of many Pi-responsive genes is stimulated by sucrose in shoots and to a lesser extent in roots, and the sugar effect in shoots of Pi-starved plants was particularly enhanced in the cre1 ahk3 double mutant. Altogether, these results indicate the existence of multidirectional cross regulation between cytokinin, sugar, and Pi-starvation signaling, thus underlining the role of cytokinin signaling in nutrient sensing and the relative importance of Pi-starvation signaling in the control of plant metabolism and development.

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Section: Cytokinin Interactions With Sugar and Pi-starvation Signalingmentioning

confidence: 79%

Interaction between Phosphate-Starvation, Sugar, and Cytokinin Signaling in Arabidopsis and the Roles of Cytokinin Receptors CRE1/AHK4 and AHK3

et al. 2005

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“…solute concentrations were higher) than in control leaves fully supplied with mineral nutrients (Taylor et al 1993). In another case, decreased root availability of mineral nutrients also resulted in early reductions (within 24 h) in leaf growth of Plantago plants (Kuiper et al 1989). Here too, however, the reductions in leaf growth were established before any significant changes could be measured in leaf concentrations of mineral nutrients.…”

Section: ±1 14±3mentioning

confidence: 95%

“…Here too, however, the reductions in leaf growth were established before any significant changes could be measured in leaf concentrations of mineral nutrients. Kuiper et al (1989) suggested that the leaf growth responses were initiated by hormonal signals (i.e. a reduction in leaf cytokinin levels; cf.…”

Section: ±1 14±3mentioning

confidence: 99%

Mineral nutrient supply, cell wall adjustment and the control of leaf growth

Snir

Neumann

1997

Plant Cell & Environment

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The possibility that changes in the plasticity of expanding cell walls are involved in regulating early leaf growth responses to nutrient deficiencies in monocot plants was investigated. Intact maize seedlings (Zea mays L.) which were hydroponically grown with their roots in low-nutrient solution (1 mol m"^ CaCl2) showed early inhibition of first-leaf growth, as compared with seedlings on complete nutrient solution. This early inhibition of leaf growth was not associated with reduced cell production. However, segmental elongation along the cell expansion zone at the base of the leaf and the lengths of mature epidermal cells were reduced by the low-nutrient treatment. Solute (osmotic) potentials in the expanding leaf tissues were unchanged. In contrast, low-nutrient treatments significantly altered leaf plasticity, i.e. the irreversible extension caused by applying a small force in the direction of leaf growth. For example, in vivo plasticity decreased, along with leaf growth, after transfer of seedlings from complete nutrient solution to low-nutrient solution for 15 h. Conversely, in vivo plasticity increased, along with leaf growth, after transfer of plants previously grown on low-nutrient solution to complete nutrient solution for 15 h. The nutrient treatments also induced similar changes in the in vitro plasticity of the expanding leaf cell walls. There were no consistent changes in elasticity. Thus, reductions in the plasticity of expanding leaf cell walls appear to be involved in controlling the early inhibition of maize leaf growth by root imposition of nutrient stress.

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“…The regulation of dry-mass partitioning in response to nutrient limitation has been attributed to cytokinins (Beck, 1996;Kuiper et al, 1988;Van der Werf and Nagel, 1996). In leaves, high cytokinin levels promote cell division, while in roots high cytokinin levels inhibit cell division (Rayle et al, 1982).…”

Section: A Hypothetical Model On a Role For Cytokininsmentioning

confidence: 99%

“…Dry-mass partitioning to the roots correlated well, for both the N and P experiment, with leaf cytokinin concentration (De Groot, 2002). Furthermore, addition of synthetic cytokinins to the nutrient solution can overcome the effects of a low mineral supply for dry-mass partitioning (Kuiper et al, 1988;Van der Werf and Nagel, 1996). This may suggest a direct relation between the decrease in cytokinin concentration upon nutrient limitation and the increase in dry-mass partitioning to the roots.…”

Section: A Hypothetical Model On a Role For Cytokininsmentioning

confidence: 99%

Response of Growth of Tomato to Phosphorus and Nitrogen Nutrition

Groot¹,

Marcelis²,

Boogaard³

et al. 2004

Acta Hortic.

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A detailed growth analysis has been conducted to unravel the separate effects of nitrogen and phosphorus nutrition on growth of young tomato plants (Lycopersicon esculentum Mill. cv. Capita) and to study their interaction. We show that relative growth rate increased sharply with increasing plant P concentration before it levelled off, resulting in a broad plateau, while the response of relative growth rate (RGR, mg g -1 day

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Effects of internal and external cytokinin concentrations on root growth and shoot to root ratio of Plantago major ssp pleiosperma at different nutrient conditions

Cited by 53 publications

References 14 publications

Interaction between Phosphate-Starvation, Sugar, and Cytokinin Signaling in Arabidopsis and the Roles of Cytokinin Receptors CRE1/AHK4 and AHK3

Interaction between Phosphate-Starvation, Sugar, and Cytokinin Signaling in Arabidopsis and the Roles of Cytokinin Receptors CRE1/AHK4 and AHK3

Mineral nutrient supply, cell wall adjustment and the control of leaf growth

Response of Growth of Tomato to Phosphorus and Nitrogen Nutrition

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