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首页> 外文期刊>Acta Biochimica Polonica >Changes in the content of gamma-linolenic C18 : 3 (n-6) and stearidonic C18 : 4 (n-3) acids in developing seeds of viper's bugloss Echium vulgare L.
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Changes in the content of gamma-linolenic C18 : 3 (n-6) and stearidonic C18 : 4 (n-3) acids in developing seeds of viper's bugloss Echium vulgare L.

机译：毒蛇牛舌草Echium v​​ulgare L的发育种子中γ-亚麻酸C18：3（n-6）和硬脂酸C18：4（n-3）酸含量的变化。

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Changes in the composition of fatty acids (FA) were determined in lipid extracts isolated from developing ovaries containing ovules and developing seeds of Echium vulgare L. The samples were collected successively over 20 days beginning with the first day after flowering. The contents of the n-6 FA family members, i.e., gamma-linolenic (GLA) (C-18: 3) and linoleic (LA) (C-18: 2) acids changed in a parallel manner and reached the maximum of 13.9% and 24%, respectively, on the 12th day, after which they fell systematically down to 8.6% and 18.2%, respectively, on the 20th day after flowering. Starting with day 13, the content of alpha-linolenic acid (ALA) (C-18: 3 n-3) begins to grow intensively, from 24.2% to 39.3% on the 20th day after flowering. The increase in the content of stearidonic acid (SDA) (C-18:4 n-3), up to 10.5% on the 20th day after flowering, occurred steadily as the seeds developed, and was independent of the changes in the content of GLA and LA. The pattern of changes in the content of SDA, GLA, LA and ALA during the development of seeds, and the occurrence of SDA in the seed oil of other plants, demonstrate that the biosynthesis of SDA in the seeds is critically dependent on the presence of ALA. The above condition indicates that SDA biosynthesis in the seeds of Echium vulgare follows the scheme LA -> simultaneous, competitive, action of Delta(6) and Delta(15) desaturases, leading to the formation of GLA and ALA, respectively, and then ALA (Delta(6) des) -> SDA. The biosynthesis according to the scheme: GLA (Delta(15) des) -> SDA is highly unlikely.
机译：测定了从含胚珠的发育中的卵巢中分离出的脂质提取物中的脂肪酸提取物（FA）的变化，以及从大叶ch的发育中的种子中分离出的脂肪酸。从开花后的第一天开始，连续20天收集了样品。 n-6个FA家族成员的含量，即γ-亚麻酸（GLA）（C-18：3）和亚油酸（LA）（C-18：2）酸呈平行变化，最高达到13.9。在第12天时分别降低了％和24％，然后在开花后的第20天分别分别下降至8.6％和18.2％。从第13天开始，开花后第20天，α-亚麻酸（ALA）（C-18：3 n-3）的含量开始急剧增长，从24.2％增至39.3％。在开花后第20天，硬脂酸（SDA）（C-18：4 n-3）的含量增加至10.5％，随着种子的生长而稳定地发生，并且与含量的变化无关。 GLA和LA。种子发育过程中SDA，GLA，LA和ALA含量的变化以及其他植物的种子油中SDA的发生方式表明，种子中SDA的生物合成关键取决于种子中SDA的存在。翼。上述条件表明，普通大戟种子中的SDA生物合成遵循方案LA-> Delta（6）和Delta（15）去饱和酶的同时竞争作用，导致分别形成GLA和ALA，然后形成ALA。 （Delta（6）des）-> SDA。根据以下方案进行生物合成的可能性很小：GLA（Delta（15）des）-> SDA。

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