Floral biology of four Ipomoea (Tubiflorae: Convolvulaceae) species
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Universidade Estadual de Maringá
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This research was carried out to evaluate the floral biology of Ipomoea acuminata, I. batata, I. cairica and I. quamoclit in Maringá, state of Paraná. Anthesis period, stigma receptivity, viability of the pollen grains and medium height of the style and filament were analyzed during the blossom period of Ipomoea. Both I. quamoclit and I. potato had their flowers opening at 6:00 a.m. and their closing at 2:00 p.m. The test of stigma receptivity demonstrated that I. quamoclit was receptive between 6:00 a.m. and 9:00 a.m. and I. batata between 6:35 a.m. and 1:00 p.m. The period of higher viability of the pollen grains in I. quamoclit was the same of the stigma receptivity. In that species, there was a reduction in the frequency of viable grains of pollen next to the time of the flowers closing. There were highest frequencies of viable pollen grains in I. batata between 6:35 a.m. and 7:00 a.m.; the variations in the frequency of viability of the pollen grains keep along the day until the flowers closing. In I. acuminata, the medium height of the style was 27.245 ± 2.431 mm and the medium height of the filament was 26.439 ± 3.147 mm. In I. batata, the medium height of the style was 19.77 mm ± 1.956 mm that is higher than the medium height of the filament. The medium height of the style in I. cairica was 19.827 mm and the medium height of the filament was 17.952 mm. In I. quamoclit the medium height of the style and the medium height of the filament had both bigger and smaller height variations of the style. For that species the estimated differences between the medium height of the style at 8:30 a.m. and the filament 1 and 4; and between the medium height of the style at 10:30 a.m. and filament 3, 4 and 5 were significant. For I. batata the differences between the medium heights of the style and of the filament were significant.
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