Cytokinin promotes catalase and ascorbate peroxidase activities and preserves the chloroplast integrity during dark-senescence

Zavaleta‐Mancera, Hilda A.; López-Delgado, Humberto A.; Loza-Tavera, Herminia; Mora‐Herrera, Martha Elena; Trevilla-García, Claudia; Vargas-Suárez, Martín; Ougham, Helen J.

doi:10.1016/j.jplph.2007.02.003

Cited by 149 publications

(92 citation statements)

References 60 publications

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“…The finding that the mutants have reduced chlorophyll levels is symptomatic of aberrant regulation in the photosynthetic system. Second, several studies have implicated cytokinin in the oxidative stress response (Bianchi et al, 2002;Zavaleta-Mancera et al, 2007); thus, the cytokinin-insensitive mutants may have a decreased ability to respond to and eliminate the reactive oxygen species produced even under normal conditions by the photosynthetic apparatus.…”

Section: Role Of Arrs In Light-sensitive Growth Responsesmentioning

confidence: 99%

Type B Response Regulators of Arabidopsis Play Key Roles in Cytokinin Signaling and Plant Development

et al. 2008

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The type B Arabidopsis Response Regulators (ARRs) of Arabidopsis thaliana are transcription factors that act as positive regulators in the two-component cytokinin signaling pathway. We employed a mutant-based approach to perform a detailed characterization of the roles of ARR1, ARR10, and ARR12 in plant growth and development. The most pronounced phenotype was found in the arr1-3 arr10-5 arr12-1 triple loss-of-function mutant, which showed almost complete insensitivity to high levels of exogenously applied cytokinins. The triple mutant exhibited reduced stature due to decreased cell division in the shoot, enhanced seed size, increased sensitivity to light, altered chlorophyll and anthocyanin concentrations, and an aborted primary root with protoxylem but no metaxylem. Microarray analysis revealed that expression of the majority of cytokinin-regulated genes requires the function of ARR1, ARR10, and ARR12. Characterization of double mutants revealed differing contributions of the type B ARRs to mutant phenotypes. Our results support a model in which cytokinin regulates a wide array of downstream responses through the action of a multistep phosphorelay that culminates in transcriptional regulation by ARR1, ARR10, and ARR12.

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Section: Role Of Arrs In Light-sensitive Growth Responsesmentioning

confidence: 99%

Type B Response Regulators of Arabidopsis Play Key Roles in Cytokinin Signaling and Plant Development

et al. 2008

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“…en este sentido, george (1996) indica que la oxidación del explante puede ser evitada o reducida si este se toma de plantas donadoras etioladas, sea, que han crecido en oscuridad total, con intensidad de luz baja o incluso en días cortos. al respecto, Zavaleta-mancera et al (2007) mencionan que en días con alta irradiación, la cantidad de energía lumínica recibida en el cloroplasto es mayor a la requerida para la fijación del CO 2 durante la fotosín-tesis, los excesos de energía son entonces captados por aceptores de electrones alternos, estimulando la formación de ros. además, Kefeli et al (2003) indican que la luz incrementa la biosíntesis de sustancias fenólicas (entre ellas, los flavonoides) en el cloroplasto, el cual constituye su principal sitio de síntesis.…”

Section: Modificación De Las Condiciones Ambientalesunclassified

Problemas de oxidación y oscurecimiento de explantes cultivados in vitro

Azofeifa

2008

Agron. Mesoam.

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“…Furthermore, cytokinins might help in the delay of oxidative damage, not only by inducing the activity of some antioxidant enzymes, but also by increasing the content of antioxidants. 21) Although the mechanisms of cytokinins are not well known in animal organisms, these studies suggest that cytokinins affect organisms and plants in many ways. Still, there have been no studies on the aging brain, or disease-attacked brain, and cytokinins.…”

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confidence: 99%