Материал из Антэкология /// Anthecology
Pollen Viability and Pollen-tube Growth Following Controlled Pollination and their Relation to Low Fruit Production in Teak (Tectona grandis Linn. f.)
Annals of Botany, 1997. V. 80. No. 4. P. 401–410 (10).
Pollen released at 1100 h has the highest viability (92.2%) but is no longer viable 3 d (84 h) after anthesis. In vitro pollen-tube growth is fast (140 μm h −1 ) and increases significantly within the first 8 h. In vivo pollen tubes also grow quickly and reach the base of the style within 2 h after pollination and enter the micropyle 8 h after pollination. There is no significant difference between self- and cross-pollination in either the rate and the number of pollen tubes in the pistil and the number of ovules penetrated by a pollen tube. Teak has late-acting gametophytic self-incompatibility; the majority of pollen tubes grow through the style but some do not continue to grow from the style towards the embryo sacs. Pollen-tube abnormalities include swollen, reversed, forked and tapered tips and irregular and spiralling tubes. These are most prevalent in self-pollination (20.4%). The index of self-incompatibility of 0.17 and low fruit set following self-pollination (2.49%) indicates that teak is mostly self-incompatible. Drastic fruit abortion occurs within the first week following controlled pollination. Within 14 d, fruit size and fruit set from cross-pollination is generally much greater than from self-pollination.