Floral development and expression of floral homeotic genes are influenced by cytokinins |
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Authors: | JJ Estruch A Granell G Hansen E Prinsen P Redig H Van Onckelen Z Schwarz-Sommer H Sommer A Spena |
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Institution: | Max-Planck-Institut für Züchtungsforschung, Carl-von-Linné-Weg 10, 5000 Köln 30, Germany;IATA (CSIC), Jaime Roig 11, 46010 Valencia, Spain;UIA, Universiteitsplein, B-2610 Antwerpen (Wilrijk), Belgium |
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Abstract: | Tobacco plants that are somatic mosaics for the expression of a cytokinin-synthesizing gene have viviparous leaves. Epiphyllous buds can be either vegetative or floral. Floral adventitious buds can be either normal or abnormal. Abnormalities of floral development correlate with: (i) a local activation of the cytokinin-synthesizing gene, (ii) a drastic increase in floral cytokinin content, and (iii) a decrease in the steady-state levels of mRNA homologues of the homeotic genes DEFA , GLO and PLENA of Antirrhinum majus . Thus, these data show in planta that cytokinins, a class of phytohormones, are able to alter the development of floral organs and to decrease the expression of three homeotic floral genes. |
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