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Pollen viability, fruit set, and yield in TB and TT. A, TT and TB pollen after Alexander’s staining. Dark pollen is viable, while empty (pale) pollen is sterile. B to D, Percentage of pollen viability (B), fruit set rate (C), and fruit yield (D) in both Tempranillo lines. The data depicted correspond to means ± sd. All data were recorded in the experimental vineyard of Finca La Grajera during the 2015 season. Similar results were obtained in two other seasons.
