Puwadon Butrat and Arkom Wangmuang

pp. 153 - 165

Abstract

The developmental studies of strobilus, seeds and embryos of Phak Miang [Gnetum gnemon (Linn.)
var. tenerum Markgr.] were conducted in Amphoe Thai-Muang of Phangnga Province, between November
2000 and October 2001 by sampling random specimens from 60 five-year old grafting plants. The results
showed that the microsporangiate strobilus were completely developed from within 45 - 49 days, and the egg
cells were not formed in the ovule. The complete development of the megasporangiate strobilus was accomplished within 49 - 56 days. In the ovule, meiosis of the megaspore mother cells produce free nuclei or cells
without wall formation and developed into the female gametophyte and some of these cells acted as eggs.
Then the female gametophyte developed an embryo-nourishing tissues without forming the embryo in the
seeds. Development of the embryo appeared at the fourth month, the seed germinated and the seedling
has two cotyledons at the seventh month after seed cultivation.