Floral attractants and rewards are essential in plant-pollinator interaction, pollen transfer to and from the flowers, and hence in crop production. In this trial, we determined the attractants and rewards of mango ‘Osteen’ cultivated under a plastic greenhouse. The attractants analyzed were inflorescence architecture and compactness, flower number, size and color patterns. Rewards determined were pollen quantity and its nutritious value and nectar volume and composition. The results show that mango forms panicles with more staminate than hermaphrodite flowers, but the latter are of higher size, more exposed to pollinator activity, and preferentially located in a better-nurtured position within the inflorescence. Pollen produced by staminate and hermaphrodite flowers was similar in quantity and quality. On the contrary, hermaphrodite flowers produced more nectar, likely because of the larger size of their nectary disks. Pollen and nectar present 17 and 22 metabolites, respectively, including carbohydrates, amino acids, and organic acids. Our study provides, for the first time, solid information about the floral attractiveness and rewards of mango cultivated under plastic greenhouses. This will help to understand the possible adaptations required for pollinating this crop under protected cultivation.

中文翻译：

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芒果的花引诱剂和对授粉者的奖励。

花引诱剂和奖励对于植物与传粉媒介的相互作用、花粉传入和传出花朵以及作物生产至关重要。在这次试验中，我们确定了塑料温室下种植的芒果“Osteen”的引诱剂和奖励。分析的引诱剂是花序结构和紧凑度、花数、大小和颜色图案。奖励的确定是花粉数量及其营养价值以及花蜜量和成分。结果表明，芒果形成的圆锥花序比雌雄同体花具有更多的雄蕊，但后者尺寸更大，更容易受到传粉者活动的影响，并且优先位于花序内更好的培育位置。雄花和雌雄花产生的花粉在数量和质量上相似。相反，雌雄同体的花产生更多的花蜜，可能是因为它们的蜜盘尺寸较大。花粉和花蜜分别含有 17 种和 22 种代谢物，包括碳水化合物、氨基酸和有机酸。我们的研究首次提供了有关塑料温室下种植的芒果的花卉吸引力和回报的可靠信息。这将有助于了解在保护性栽培下为这种作物授粉所需的可能的适应措施。