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Annals of Botany 80: 401-410, 1997
© 1997 Annals of Botany Company

Pollen Viability and Pollen-tube Growth Following Controlled Pollination and their Relation to Low Fruit Production in Teak (Tectona grandisLinn. f.)

SUWAN TANGMITCHAROEN and JOHN N. OWENS+,

ASEAN Forest Tree Seed Centre, Muak Lek, Saraburi, Thailand, 18180 Centre for Forest Biology, University of Victoria, Victoria, B.C., Canada, V8W 2Y2

Received August 28, 1996 ; Accepted April 2, 1997 .

Pollen released at 1100 h has the highest viability (92.2%) but is no longer viable 3 d (84 h) after anthesis.In vitropollen-tube growth is fast (140 µm h-1) and increases significantly within the first 8 h.In vivopollen 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.

Tectona grandis; pollen viability; pollen-tube growth; pollination; controlled pollinations; incompatibility.


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