THE ROLE OF ZINC IN THE GROWTH OF PLANT TISSUE CULTURES

Klein , Richard M., Emerita M. Caputo , and Barbara A. Witterholt . (New York Bot. Gard., N. Y., N. Y.) The role of zinc in the growth of plant tissue cultures. Amer, Jour. Bot. 49(4): 323–327. Illus. 1962.—Zinc-sufficient and zinc-deficient auxin-auxotrophic callus and auxin-prototrophic crown-gall cultures of Parthenocissus tricuspidatus were examined for their growth capacity and ability to synthesize tryptophan. Growth capacity decreased rapidly when zinc ion was withheld and tryptophan synthetase activity in vitro was reduced. Growth of –Zn crown-gall tissues was stimulated by either auxin or tryptophan and growth of –Zn callus cultures was stimulated by tryptophan.     

白鱀豚组织培养的初步研究

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ELECTRON MICROSCOPY OF THE TISSUE MAST CELL

Electron microscopy was carried out on sections through tissue mast cells from the peritoneal fluid of rats and hamsters, either untreated, x-irradiated, or injected with toluidine blue, protamine sulfate, or stilbamidine. Mast cells from untreated animals have large nuclei and are filled with densely packed, cytoplasmic granules. The latter possess a distinct boundary and an internal structure which is reticular or vacuolar in nature. Between the granules are found elongate mitochondria and endoplasmic reticulum. Mitochondria often appear also in groups in granule-free areas adjacent to the nucleus. Nuclear and cell membranes of an apparent double nature are found. After treatment with toluidine blue, protamine sulfate, and stilbamidine the granules are surrounded by clear areas and are widely separated from one another; the endoplasmic reticulum is more conspicuous. The internal structure of the granule is unchanged. In the mast cells from x-irradiated animals there is an apparent coalescence of granules which is attented by a loss of intragranular structure. The findings are discussed in relation to other work on the structure and function of mast cells.     

大鼠睾丸间质组织内的生殖细胞

在本实验中,光镜和电镜观察发现,在一例正常大鼠的局部睾丸的间质组织中,存在着不同发育时期的生殖细胞,同时还见支持细胞。上述各类细胞的超微结构同精细管内的无明显差别;但在位置上,它们却是分散于间质组织内,或者同间质细胞紧密相靠排列,或者分布于血管周围。本事实表明,在大鼠睾丸的间质组织中,可能也存在着生殖细胞赖以生存、发育和分化的环境条件。本文对这一现象的意义作了讨论。     

几种观赏花卉的组织培养

自1982年来,我园用组织培养的方法对君子兰、五星花、重瓣矮牵牛、贴梗海棠、药百合等观赏花卉进行了实验,均取得了成功,其中部份试管苗移栽土壤成功,并已开花。下面将实验结果小结如下: 1.君子兰Clivia nobilis