【摘要】 红松是我国主要用材树种,材质优良。我国主要分布在长白山和小兴安岭,随着森林工业的发展,大面积的原始森林迅速减少,人工更新日趋重要。在生产中采用种子育苗,因此对红松种子的发育规律应全面掌握,以便为种子园建立、良种选育采取有效措施提供理论依据。根据国内外有关报导,红松雌雄配子的形成、受精作用已有一定的研究,但这些研究只侧重在小孢子母细胞的减数分裂和受精作用。故对雌雄配子体的发育过程仍需深入研究,尤其是授粉后的雄配子体发育和精子进入颈卵器的过程,均未见详细报导。本文着重研究红松配子体的发育过程,从成熟花粉到精卵结合。以及游离核在第二年的分裂过程。游离核分裂的确切次数还有待进一步研究。更多还原

【Abstract】 The period of pollination of Pinus koraiensis is from June 8to 20. During June 25--30, pollen grains germinate on thenucella, forming pollen tubes. On August 4, reproductive cellsin the pollen grain divide mitotically into the sterile cellsand spermatogenous cell. Next year, on June 3, spermatoge-nous cells divide into two male gametes of unequal size. Thenin the pollen graint tube, a long ribbon is formed, with starchgrain at the first place, followed by the tube nucleus, the ste-rile cell, the big male gamete and the small male gamete. Functional megaspores of P. kolaiensis divide five times du-ring July 5 to September 23, producing 32 free nuclei, then gointo dormancy. In the next spring, free nuclei divide again.At the end of May, cell walls of female gametophytes are for-med between free nuclei. At the sametime, the archegonium initialis formed at the microphyle end of the female gamete, develo-ping into 1--4 archegonia, mainly 3; archegonium single, cover-ed with a layer of Jacket cells. Neck cells are of 1--2 layers.altogether 4 cells. on June 4, central cells begin to divide, con-tinuing the division till June 10, forming ventral canal celland egg cell. From June 11. fertilization begins at the uppermiddle part of the egg cell.更多还原