Enclosure of Pollinated Flowers Weakens the Gametophytic Self-Incompatibility Response inLycopersicon peruvianum

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Abstract
Williams, E. G. and Webb, M. C. 1987. Enclosure of pollinated flowers weakens the gametophytic self-incompatibility response in Lycopersicon peruvianum.— J. exp. Bot. 38: 1756–1764. Enclosure of pollinated flowers in a restricted airspace weakens the gametophytic self-incompatibility response in the wild tomato, Lycopersicon peruvianum (L.) Mill. This 'closed box effect' occurs both for detached flowers in a semi-vitro system, and in situ for flowers attached to the plant. Entry of self pollen tubes into ovules is observed in both systems. When pedicels are treated with IAA to prevent abscission of flowers and poorly filled fruits, the method can be used to obtain selfed seed from mature flowers on the plant. Ethylene is detectable in containers enclosing flowers, and is considered a more likely agent of the effect than carbon dioxide or high relative humidity.