Abstract
Petunia (Petunia X hybrida Vilm.) 'Baccarat Blue' under high pressure sodium lamp (HPS) exhibits, dwarfism compared with one grown under a daylight type metal halide lamp (MH). The role of gibberellin (GA) in this growth change, caused by artificial lighting was investigated. The amounts of GA20 and GA1 were lower in petunia grown under HPS than those under MH, but, the levels of GA19 were similar in both treatments. Plant height of petunia was decreased by treatment with uniconazol, but the difference in plant height between treatments was small. GA3 application promoted stem elongation of uniconazol-treated petunia; the magnitude of stem elongation was independent of light source. These results indicate that dwarfism in petunia under HPS is caused by lower GA20 and GA1 contents, but not by GA sensitivity. The GA biosynthesis step of GA19 to GA20 may be affected by the light quality of these lamps.
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