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8 �� 0.3 stamens form and surround SRT1720 clinical trial the central receptacle dome. Each flower carries 248 384 �� 12 469 pollen grains; of which 47.9 �� 1.9 % are viable and 13.7 �� 0.7 % are non-viable. The pistil of each flower is the innermost whorl made up of 326 �� 18 carpels. Each carpel consists of a stigma, a style an ovary and one ovule (Hancock 1999). Carpels are embedded in the epidermis of the receptacle in a spiral pattern. The percentage of immature stigmas and aborted ovules was 7.7 �� 1.4 % and 12.3 �� 1.2 %, respectively. These results highlight a degree of functional failure of the reproductive structures in F.�� ananassa under non-stressful conditions. However, these modest levels of failure do not necessarily translate into reduce fruit set or damage to development (Ariza et al. 2011, 2012). The flower of F.�� ananassa has considerably more bracts per whorl and is bigger than F. vesca (?1.4 cm versus ?0.7 cm, respectively; Hollender et al. 2012). In F.�� ananassa, flower buds increased linearly from 0.1 to 1.5 cm at anthesis over 17�C18 days with a growth rate ?1 mm day?1 (Fig.?1). Time to reach anthesis may differ between both Fluorouracil research buy species but data for F. vesca are not available. Changes in bud growth were linked to landmark events, allowing a chronological ranking of various developmental stages. Figure?1. Relationship between days before anthesis and length of flower bud in cultivated strawberry. The regression model fitted (days before anthesis = ?12.443x + 17.754, R2 = 0.97, P UNC2881 at a specific bud size. However, the model of floral development presented here for F.�� ananassa integrates the main and significant changes occurring in the overall parts of the flower at a given time. Male gametophyte development At early stages of male gametophyte development (