Original Article | 2004, Vol.26, No.2, pp. 153-165
Development of strobilus, seed and embryo of Phak Miang. [Gnetum gnemon (Linn.) var. tenerum Markgr.]
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.
