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  • Functional classification of olive pollen esterases
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    Functional classification of olive pollen esterases

    Pollen grains contain numerous hydrolytic enzymes, many of which are released upon contact with the stigma. Rejón et al. carry out for the first time a systematic functional classification of esterases in pollen grains from a plant with a wet stigma, Olea europaea. They find that olive pollen esterases can be classified into four functional groups: […] More

  • Detail of the stigma of a flower of apple, Malus × domestica
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    August Image: Apple Stigma

    This month the inset cover image shows a detail of the stigma of a flower of apple, Malus × domestica. The acquisition of stigmatic receptivity is concomitant with secretion of arabinogalactan proteins (AGPs, strained green) into the intercellular spaces between cell walls (blue). More