The effect of cotyledons on hypocotyl elongation in light-grown bean seedlings : Comparison between dwarf and tall varieties

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Hypocotyl sections with and without the cotyledons were cut from bean seedlings and incubated under white light of 6000 lux. The cotyledons had an inhibitory effect as well as a promotive effect on hypocotyl growth. The former effect was more striking in the dwarf variety, and the latter in the tall variety. When the hypocotyl units were exposed to light for shorter times (6 hr or less) or incubated under weaker light (1600 and 50 lux), the inhibitory effect of the cotyledons decreased greatly, and in the tall variety the presence of cotyledons produced no inhibition, but a promotion of hypocotyl growth. GA treatment enhanced hypocotyl growth and counteracted the growth inhibition caused by the cotyledons. On the whole, the GA effect was more marked in the tall variety than in the dwarf. The elongation of bean hypocotyls may be controlled by a balance between the inhibitory and promotive effects of cotyledons, and the predominance of the former over the latter may be one of the causes for expressing dwarfing.
日本植物生理学会の論文