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Plant architecture is a major consideration during the commercial production of chrysanthemum ( Dendranthema grandiflora  Tzvelev). We have addressed this problem through a biotechnological approach: genetic engineering of chrysanthemum cv. Iridon plants that ectopically expressed a tobacco phytochrome B1 gene under the control of the CaMV 35S promoter. The transgenic plants were shorter, greener in leaves, and had larger branch angles than wild-type (WT) plants. Transgenic plants also phenocopied WT plants grown under light condition depleted of far-red wavelengths. Furthermore, the reduction of growth by the expressed PHY-B1 transgene did not directly involve gibberellins. The commercial application of this biotechnology could provide an economic alternative to the use of chemical growth regulators, and thus reduce the production cost.

hortscience

083 Modification of Plant Architecture in Chrysanthemum: Reduction of Height and Increase of Branch Angle through Ectopic Expression of a Phytochrome B1 Gene