Summary
Pollen grain germination inside anthers has so far been known in only eleven chasmogamous angiospermous species. The discovery of this phenomenon in some varieties of Prunus amygdalus (almond) and Malus pumila (apple) is therefore significant. The anomaly appears to be genetically controlled, the gene expression occurring under specific environmental conditions.
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Koul, A.K., Singh, A., Singh, R. et al. Pollen grain germination inside the anthers of two chasmogamous angiosperms: Almond (Prunus amygdalus L. Batsch) and apple (Malus pumila Mill.). Euphytica 34, 125–128 (1985). https://doi.org/10.1007/BF00022871
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DOI: https://doi.org/10.1007/BF00022871