【摘要】 本文报道软毛猕猴桃的早期胚胎发生的研究:——1.子房上位,具34—45个心皮,每心皮含11—45个胚珠。胚珠倒生,单珠被,薄珠心。孢原为1—3个细胞组成,仅有一个转变为大孢子母细胞,其余的退化。2.成熟花粉粒为二细胞型。胚囊蓼型。在大多数胚囊中,两个极核受精前合并为次生核,少数到受精时仍不合并。一个助细胞为花粉管所破坏,另一个在受精期间解体,个别的保持到初生胚乳核分裂时期。3.根据观察,在北京地区,软毛猕猴桃的双受精大多发生在授粉后30—72小时内。受精时,一个精子同卵细胞核融合,另一个同次生核融合,其融合过程较卵核和精子融合结束的早。4.胚乳发育为细胞型。更多还原

【Abstract】 This paper deals with early embryogenesis of Actinidia chinensis var.chinensis.1.Ov- ary superior consists of 34—45 carpels.Each carpel contains 11—45 ovules.The ovule is uni-integument and tenuinucellar.The ovule is anatropous.The archesporium is formed by a single cell,and directly develops into megaspore mother cell.Sometimes the archespori- um consists of 2—3 cells,but only one of them develops into megaspore mother cell and the others are degenerated.2.The mature pollen grain is two-celled and the embryo sac belongs to Polygonum type.In most embryo sacs two polar nuclei are fused before fertilization. One of the synergids was destroyed as the pollen tube penetrated into embryo sac,the other one disappeared after fertilization.In most cases the antipodal cells became degenerated in fertilization process,only some remained until the first division of primary endosperm nu- cleus.3.In Beijing area the double fertilization of Actinidia chinensis occurred 30—72 ho- urs after pollination.In the fertilization one sperm fused with egg nucleus and the other sperm fused with the secondary nucleus as usual.The fusion of the secondary nucleus with sperm was in advance of the fusion of the egg nucleus.4.The endosperm is cellular type.更多还原