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Control of early ethylene synthesis in pollinated petunia flowers

Control of early ethylene synthesis in pollinated petunia flowers

Plant Physiology & Biochemistry 25(4): 431-438

Ethylene production by stigmas of petunia (Petunia hybrida L. cv. Pink Cascade) increases within five minutes of the application of pollen. This rapid increase is prevented by prior application of an inhibitor of 1-amino-1-cyclopropane carboxylic acid (ACC) synthase [(2-amino-ethoxyvinyl)-glycine, AVG], and by an inhibitor of protein synthesis (cycloheximide) but not by inhibitors of DNA-dependent RNA synthesis (.alpha.-amanitin, actinomycin D). Activity of ACC synthase in the stigma increases following pollination, but remains low in the style. The ethylene-forming enzyme (EFE) is constitutive in the stigma, and has highest activity at anthesis. The EFE is shown to be located very close to the surface of the stigma. The high osmolarity of the stigmatic exudate (> 4 Osm) appears to restrict diffusion of ACC from the pollen to the stigmatic EFE. Application of ethylene to the stigmas of unpollianted flowers does not result in the acceleration of senescence which follows pollination.

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