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对狗枣猕猴桃果实发育进行了显微和超微结构观察。其主要过程可分为 :1 .早期胚胎发育 :多心皮合生子房 ,通常具 1 6个心室 ,中轴胎座。中轴上着生大量倒生胚珠 ,单珠被 ,具珠被绒毡层。胚囊蓼型。授粉后约 2～ 4h花粉萌发。授粉后约 1 2 0h花粉管到达胚珠。受精后 ,初生胚乳核分裂先于合子。胚乳发育为细胞型。2 .果壁 :果壁可分为果皮、果肉和果心三部分。果皮较薄 ,由 2～ 3层薄壁细胞组成。外表面光滑无毛 ,但覆有角质层 ,气孔下陷 ,分布于其中。果肉的大部分由薄壁细胞组成 ,分大、小两种细胞 ,小细胞含较多淀粉粒 ,淀粉粒的水解是果实软化的原因之一。果肉薄壁组织细胞还含有叶绿体及两种异细胞 ,一种异细胞内含物为结晶 ,普遍存在 ;另一种含被番红染成红色的絮团状物。果心由维管束和薄壁细胞组成 ,维管束不发达。 3 .种子 :种皮外表面呈蜂窝状 ,种皮较硬 ,由两层细胞构成。线性直立胚 ,胚乳发达 ,主要贮藏物是蛋白质。
Microscopic and ultrastructural observation on the fruit development of Actinidia chinensis. The main process can be divided into: 1. Early embryonic development: multi-carpel epiphytic ovary, usually with 16 ventricles, axonal placenta. The axis of a large number of raw oviparous ovules, a single beaded, beaded tapestry. Embryo sac Polygonum type. About 2 ~ 4h pollination after pollination. The pollen tube reaches the ovule about 120 h after pollination. After fertilization, primary endosperm nuclear division before zygote. Endosperm is a cell type. 2 fruit wall: fruit wall can be divided into peel, pulp and fruit heart three parts. Peel thin, from 2 to 3 layers of parenchyma cells. The outer surface of smooth hairless, but covered with the stratum corneum, stomatal depression, distributed in them. Most of the pulp consists of parenchyma cells, divided into large and small cells, small cells containing more starch, starch granulation is one of the reasons the fruit softening. Parenchyma parenchyma cells also contain chloroplasts and two different cells, one of the isocytic inclusions is crystalline, ubiquitous; the other containing red was flocculation of floc particles. Fruit heart by the vascular bundle and parenchyma cells, vascular bundle underdeveloped. 3 seeds: the outer surface of the seed coat honeycomb, the seed coat is hard, composed of two layers of cells. Linear erect embryos, endosperm developed, the main storage is protein.