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Spatiotemporal dynamics of nectar secretion in ‘Tarocco’ blood orange: Coordinated with floral hormones, starch mobilization, and stomatal control
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DOI：10.1016/j.scienta.2026.114956.png)
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Abstract
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• Nectar secretion in ‘Tarocco’ blood orange peaks within the first 48 h post-anthesis. • Early floral tZR accumulation coincides with rapid starch buildup in the nectary. • Peak floral GA3 and amylase activity align with rapid nectary starch hydrolysis. • Reduced floral ABA levels are associated with stomatal opening during peak nectar exudation. • Nectary senescence is accompanied by IAA-associated nutrient reallocation for fruit set.
Keywords:
Blood orange
Citrus sinensis
Nectar secretion
Nectary anatomy
Phytohormones
Sink strength
Starch metabolism
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