BRASSINOSTEROIDS - OCCURENCE AND CHEMICAL STRUCTURES IN PLANTS
BRASSINOSTEROIDS - OCCURENCE AND CHEMICAL STRUCTURES IN PLANTS
复制标题
DOI：
10.1007/978-94-007-0189-2_1
复制
发表时间：
2011-01-01
期刊：
影响因子：
--
通讯作者：
Bajguz, Andrzej
中科院分区：
文献类型：
--
作者：
Bajguz, Andrzej
油菜素类固醇(BRs)是一类植物多羟基类固醇，已被认为是一种新的植物激素，在植物发育中起着重要的作用。BR在整个植物王国中以低浓度发生。它们存在于所有植物器官(花粉、花药、种子、叶、茎、根、花和谷粒)以及昆虫和树冠的鳞中。BRs在结构上与动物和昆虫的类固醇激素有关。到目前为止，已发现的天然69个BRs具有共同的5α-胆甾烷骨架，它们的结构变化来自于A环和B环上含氧官能团的种类和取向。至于B环的氧化，BR分为7-草内酯、6-酮(6-氧)和6-脱氧(未氧化)。根据侧链上C-24上的烷基取代程度不同，这类化合物可分为C-27、C-28或C-29BRs。除了游离的BRs外，在植物中也发现了糖和脂肪酸的结合物。
Brassinosteroids (BRs) are a class of plant polyhydroxysteroids that have been recognized as a new kind of phytohormones that play an essential role in plant development. BRs occur at low concentrations throughout the plant kingdom. They have been detected in all plant organs (pollen, anthers, seeds, leaves, stems, roots, flowers, and grains) and also in the insect and crown galls. BRs are structurally related to animal and insect steroid hormones. Natural 69 BRs identified so far, have a common 5 alpha-cholestan skeleton, and their structural variations come from the kind and orientation of oxygenated functions in rings A and B. As regards the B-ring oxidation, BRs are divided into 7-oxalactone, 6-ketone (6-oxo) and 6-deoxo (non-oxidized). These steroids can be classified as C-27, C-28 or C-29 BRs depending on the alkyl-substitution on the C-24 in the side chain. In addition to free BRs, sugar and fatty acid conjugates have been also identified in plants.