论文部分内容阅读
描述巴西橡胶树果皮和种皮在各个不同发育时期的解剖结构。（1）授粉后约120d，果皮和种皮发育成熟。（2）果皮由子房壁发育形成。授粉30d后，果皮可区分为外果皮、中果皮和内果皮三层结构。外果皮由表皮和表皮下7～8层绿色扁平细胞构成，中果皮由等径薄壁细胞构成，其上分布维管束及密集成群的初生乳管，内果皮由三层走向不同的长形细胞组成。授粉后60～70d，内果皮细胞开始木质化。果实成熟时，外中果皮革质而干燥，内果皮发育成为木化坚硬的果壳。（3）种皮由外种皮和内种皮构成。外珠被发育成薄膜状外种皮，部分表皮细胞含有色素，含色素的表皮细胞与不含色素的表皮细胞相间排列，形成外种皮上的花纹，表皮外壁有一蜡质层。内珠被发育成内种皮。授粉60d以后，内珠被细胞开始分化：内珠被外表皮细胞呈辐射状伸长并木质化，成为栅栏状厚壁组织，以后发育成坚硬的“种壳”，内珠被外表皮以内的组织发育成为疏松的薄壁组织，呈海绵状附在种壳内面。
Describe the anatomical structure of the pericarp and seed coat of Acacia crassipes at different developmental stages. (1) about 120 days after pollination, the peel and seed coat mature. (2) peel from the formation of ovarian wall development. After pollination for 30 days, the pericarp could be divided into three layers: exocarp, mesocarp and endocarp. The outer pericarp consists of 7 to 8 layers of green flattened cells under the epidermis and epidermis. The mesocarp is composed of isoforms of parenchyma cells, on which vascular bundles and densely arranged primary ducts are distributed. The endocarp goes from three layers to different long Cell composition. 60 ~ 70d after pollination, endocarp cells began to lignification. When the fruit is ripe, the outer mesocarp is leathery and dry, and the endocarp develops into a hardened woodchuck shell. (3) The seed coat consists of outer seed coat and inner seed coat. The outer beads are developed into thin film-like outer seed coat, part of the epidermal cells contain pigment, pigment-containing epidermal cells and non-pigmented epidermal cells arranged alternately to form a pattern on the outer seed coat, epidermal outer wall with a waxy layer. Inner bead is developed into inner seed coat. After 60 days of pollination, the inner bead cells begin to differentiate: the inner bead is radically elongated and lignified by the outer epidermis cells, becomes a palisade thick-walled tissue and later develops into a hard “seed shell”, the inner bead is covered by the outer skin Tissue development becomes loose parenchyma, sponge attached to the seed shell inside.