Characteristics of Nectar Secretion by Lycium cestroides, L. ciliatum (Solanaceae), and Their Hybrid(Reproductive Biology)

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Nectar sugar composition, nectar secretion patterns, and effects of removal are compared in a natural hybrid experimentally supported (Lycium ciliatum × cestroides) and its parental species (L. ciliatum and L. cestroides). The nectar of L. ciliatum and L. ciliatum × cestroides is hexose dominant, but each taxon shows a distinctive pattern : more glucose than fructose in the former and the opposite pattern in the latter. L. cestroides has sucrose-rich nectar with more fructose than glucose. Both parental species show a similar sugar production pattern : the sugar content declines at the end of the flower lifetime due to nectar reabsorption. In contrast, in the hybrid, nectar secretion is continuous and there is no nectar reabsorption. Data obtained among the taxa are correlated with corolla depth : the deeper the corolla tube, the more diluted and the higher the volume of the nectar. Nectar production after removal is increased in L. cestroides whereas it is not affected in the hybrid or in L. ciliatum. Chemical composition and response to removal relate the hybrid to the maternal parent (L. ciliatum).
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