The effects of flowering period on flower characteristics and fruit set were determined by using three 6-year-old 'Flordaglo' trees grown at Angkhang Station. The flowering periods were classified into five terms: term I, before 20 November; term II,from 21 November to 30 November; term III, 1 December to 10 December; term IV, 11 December to 20 December; Term V, 21 December to 31 December. Flowers collected in terms IV and V had smaller pistils and ovaries than those collected in the earlier terms and ovule size was also small. In contrast, the pollen germinability was higher in terms IV and V. Regarding the development of embryo sacs at anthesis, most of the embryo sacs were at megagametophyte or two-nucleate stage in all terms. At 7 days after anthesis, some embryo sacs degenerated in terms I, II, IV, and V. The percentage of fruit set at 30 days after anthesis was lower than 60% in terms IV and V.
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