A Connection between the Self-Incompatibility Mechanism and the Stress Response in Lily

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An attempt was made to examine the possible connection between self-incompatibility in Lilium longlflorum and the stress response using pistils after self-incompatible pollination. The growth of pollen tubes in the pistil after self-incompatible pollination was promoted by treatment with germanium compounds [(GeCH_2CH_2COOH)_2O_3 and GeO_2], which are scavengers of active oxygen species, such as O_2 and H_2O_2. The promotion by germanium compounds of the growth of pollen tubes after self-incompatible pollination was reflected by the detection of elevated levels of activity of superoxide-forming NADPH-dependent oxidase, xanthine oxidase, superoxide dismutase, catalase and ascorbate peroxidase, all of which are associated with stress responses, in pistils upon self-incompatible pollination as compared to the activities of these enzymes after cross-compatible pollination. A possible connection between self-incompatibility and stress in pistils upon self-incompatible pollination is discussed on the basis of these results.
日本植物生理学会の論文