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Histological analysis of stamens from floral buds and mature flowers of mock-inoculated and silenced plants. The floral buds of plants inoculated with pCF93-PDS-int (mock) formed normal pollen sacs containing pollen grains. In contrast, floral buds of plants silenced for a candidate gene (EXPA9 here) had no pollen. Pollen sacs of mature mock flowers displayed a normal morphology, but those of silenced plants were atrophied (arrow). Scale bars, 200 and 500 µm.
