Summary
The flow of calcium ions from the stigma to germinating pollen was studied by autoradiography in Primula officinalis (dry stigma) and Ruscus aculeatus (wet stigma). 45Ca2+ ions were observed to be taken up by the pistils from an agar medium and then transported intracellularly to both the stigmal cells and the stigmal exudate. The 45Ca2+ present in the stigma was taken up by the germinating pollen grains.
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References
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Bednarska, E. Calcium uptake from the stigma by germinating pollen in Primula officinalis L. and Ruscus aculeatus L.. Sexual Plant Reprod 4, 36–38 (1991). https://doi.org/10.1007/BF00194569
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DOI: https://doi.org/10.1007/BF00194569