Identification and concentration of endogenous cytokinins in carrots (Daucus carota L.) as influenced by development and a circadian rhythm

Tipo de material: Texto

TextoSeries Journal of Plant Physiology, 127(1-2), p.111-121, 1987Trabajos contenidos:

Stiebeling, B.;Neumann, K. H

Tema(s):

PLANT PARDAUCUSITIC NEMATODES

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Resumen: The major cytokinins in carrot (Daucus carota L.) were identified as 2-isopentenyladenine and 2-isopentenyladenosine. Both cytokinins occurred in the shoot, whereas only 2-isopentenyladenine could be detected in the root. The concentration of these two cytokinins increased with the development of the taproot and a strong positive correlation was found between root diameter and endogenous cytokinin concentration. An oscillation of the cytokinin concentration over 24 hours was observed in 4 different carrot cultivars and the wild carrot, with a maximum around noon and a minimum at night. Since these changes in cytokinin concentration over 24 hours could be maintained under environmentally controlled conditions it was concluded that a circadian rhythm exists for endogenous cytokinin concentration.

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Artículo

The major cytokinins in carrot (Daucus carota L.) were identified as 2-isopentenyladenine and 2-isopentenyladenosine. Both cytokinins occurred in the shoot, whereas only 2-isopentenyladenine could be detected in the root. The concentration of these two cytokinins increased with the development of the taproot and a strong positive correlation was found between root diameter and endogenous cytokinin concentration. An oscillation of the cytokinin concentration over 24 hours was observed in 4 different carrot cultivars and the wild carrot, with a maximum around noon and a minimum at night. Since these changes in cytokinin concentration over 24 hours could be maintained under environmentally controlled conditions it was concluded that a circadian rhythm exists for endogenous cytokinin concentration.

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