Lactuca bungeana의 資源開發에 관한 硏究 : I.雌雄性配偶體形成 및 受精現象 I.Formation of male and female gametophyte,and fertilization = Studies on the Development of Resourse Plant of Lactuca bungeana

다국어 초록 (Multilingual Abstract)

The present experiments were carried out to investigate the male and female gametophyte formation, and fertilization of Lacutuca bungeana which is a resource plant for vegetable crops. the results are summarized as follows;
1. Meiotic division of pollen mother cell is regular, and its tetrad is a tetrahedral type.
2. After early microspore stage the tapetal tissue is detached from the microsporangial wall and envelopes the microspores, and at the mature pollen stage it is disappered completely.
3. Ovule shows a anatropous type and integument is unitegumic. Nucellar type is a tenuinucellate type.
4. The arrangement of megaspore tetrad is of linear type. The micropylar end megaspore of linear tetrad is developed into embryo sac.
5. Embryo sac is a monosporic 8-nucleate polygonum type.
6. After pollination pollen grain is germinated immediately and the growth type of pollen tube is a monosiphonous.
7. Fertilization takes place usually within the blooming date, and in 7 days after pollination mature seed is developed.