【摘 要】
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Dear Editor,Plants secrete nectar to attract mutualistic animals,which predominantly function as pollinators,as in the case of floral nectar,or defenders agains
【机 构】
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University Würzburg, Biozentrum, Julius-von-Sachs-Institut für Biowissenschaften, Julius-von-Sachs-P
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Dear Editor,Plants secrete nectar to attract mutualistic animals,which predominantly function as pollinators,as in the case of floral nectar,or defenders against herbivores,as in the case of extrafloral nectar (Nicolson et al.,2007).Because nectars usually represent aqueous solutions containing sugars and other nutrient metabolites (Baker and Baker,1983),they are susceptible to infestation by microbial organisms,which can use the nectar-secreting tissues as entry sites to infect the plant.Nectar-secreting tissues thus require an efficient shield against pathogen infections.To date,our knowledge about the way that plants protect their nectar from microorganisms is rather limited.Several reports have focused on defensive chemicals,such as alkaloids and phenols,or a defense system based on proteins named nectarins (cf.Escalante-Pérez and Heil,2012).In floral nectar of oamental tobacco,nectarins have been associated with a so-called
ectar redox cycle.
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