Summary
The nature and process of ovular incompatibility in Gasteria verrucosa was studied. Using different crossing programs and following the pollen germination and ovule penetration histochemically, an ovular gametophitic incompatibility system based on two or more loci is affirmed. Pollen tubes after self-and cross-pollination penetrate the micropyle. Although the percentage of seed setting reached about 60% after cross pollination no clear differences could be seen between the germination and ovule penetration of cross and self pollen.
In the ovules, multiple penetration of micropyles and a preference for the first position ovules was observed. Results of semi-compatible crossings and mixed crossings indicated a gametophytic two or more loci incompatibility system. Ovular incompatibility was manifested by the degeneration of the sporophytic ovular tissues. In Gasteria verrucosa the system of ovular incompatibility does not seem to be restricted to the ovule.
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Naaborgh, A.T., Willemse, M.T.M. The ovular incompatibility system in Gasteria verrucosa (Mill.) H. Duval. Euphytica 58, 231–240 (1991). https://doi.org/10.1007/BF00025254
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DOI: https://doi.org/10.1007/BF00025254