Floral development and expression of floral homeotic genes are influenced by cytokinins.
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 homologous 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.
Estruch
J J
JJ
Max-Planck-Institut für Züchtungsforschung, Köln, Germany.
Granell
A
A
Hansen
G
G
Prinsen
E
E
Redig
P
P
Van Onckelen
H
H
Schwarz-Sommer
Z
Z
Sommer
H
H
Spena
A
A
D001483:Base Sequence; D003583:Cytokinins / Q000235:genetics* / Q000502:physiology; D018076:DNA, Complementary / Q000235:genetics; D015870:Gene Expression; D005801:Genes, Homeobox; D017343:Genes, Plant; D008969:Molecular Sequence Data; D030821:Plants, Genetically Modified; D010947:Plants, Toxic; D014026:Nicotiana / Q000235:genetics* / Q000254:growth & development / Q000502:physiology
D003583:Cytokinins; D018076:DNA, Complementary