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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Occurrence of non-protoplasmic mineral deposition in seed coat of Biota orientalis Endl. (Cupressaceae)
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Occurrence of non-protoplasmic mineral deposition in seed coat of Biota orientalis Endl. (Cupressaceae)

机译：侧柏生物种皮中非原生质矿物沉积的发生。 （柏科）

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摘要

Biomineralization of calcium crystals is of common occurrence in all photosyn-thetic organisms from small algae to an-giosperms and giant gymnosperms. Calcium oxalate crystals occur in plants in two principal forms, monohydrate (CaC_20_4H_20) and dihydrate (CaC_20_4-2H_20). Each of these has a different crystal structure. The monohydrate form known as whewellite belongs to the mono-clinic system of crystallization, and the dihydrate form known as weddellite, belongs to the tetragonal system. The crystals have specific shapes and sizes, and are usually found in the form of prisms, druses, styloids, raphides and crystal sand. Their occurrence and abundance in specific tissues of various plants are so constant that they are often used as a taxonomic tool. Calcium oxalate crystals are found in various plant parts and occur in the cell wall or vacuole within specialized cells called idioblasts. The crystals in the vacuole are formed within the intravacuolar membrane chambers (crystal chambers) that differentiate and proliferate exclusively in the vacuoles of crystal cells.
机译：在从小藻类到被子植物和大型裸子植物的所有光合生物中，钙晶体的生物矿化现象普遍存在。草酸钙晶体以两种主要形式存在于植物中，一水合物（CaC_20_4H_20）和二水合物（CaC_20_4-2H_20）。这些都具有不同的晶体结构。一水合物形式称为辉绿岩，属于结晶的单斜晶体系，二水合物形式称为绿闪石，属于四方晶系。晶体具有特定的形状和大小，通常以棱柱形，微晶形，茎状茎状，硫化物和晶体沙的形式存在。它们在各种植物的特定组织中的发生和丰度非常恒定，以至于经常被用作分类工具。草酸钙晶体存在于植物的各个部位，并存在于细胞壁或液泡中，称为特异成纤维细胞。液泡中的晶体形成在真空内膜腔室（晶体腔室）中，所述膜腔室中的膜仅在晶体细胞的液泡中分化和增殖。

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