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Abstract
In order to characterize devitalized pollen (which can be used as a “mentor” in mixed pollinations), certain hydrolase activities were spectrophotometrically tested in normal and in methanol or gamma irradiation-treated pollen of Malus domestica Borkh. cultivar ‘Golden Delicious’, and in normal pollen of the cultivar ‘Starkrimson’. Enzymatic activities of methanol-treated pollen were somewhat decreased, except for acid phosphatase which was enhanced over the control. This increase could be due to a higher hydrolysis rate by the alcohol, and/or to enzyme activation after damage of the lytic organelle membranes. Amylase, cellulase, ribonuclease and particularly acid phosphatase activities were stimulated in irradiated pollen. It was hypothesized that there was an enzyme leakage from the lytic compartment following pollen irradiation. On the basis of these data on enzymatic activities, it can be concluded that comparable effects were induced by either methanol or irradiation treatment of apple pollen.
Published Version
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