Фізіологія рослин і генетика 2021, том 53, № 6, 484-500, doi: https://doi.org/10.15407/frg2021.06.484

Стратегії підвищення вмісту альфа-токоферолу в рослинах

Мокросноп В.М., Золотарьова О.К.

  • Iнститут ботаніки ім. М.Г. Холодного Національної академії наук України 01004, Київ, вул. Терещенківська, 2, Україна

Основними способами отримання a-токоферолу (a-T) є хімічний синтез та екстракція a-T з рослинних олій. Широко використовувана синтетична форма під назвою all-rac-a-токоферол складається із суміші восьми стереоізомерів, при цьому частина природного стереоізомеру RRR-a-токоферолу становить усього 12,5 %. Природний a-Т в 1,5 раза активніший за синтетичні форми, тому пошук ефективних джерел природного a-Т триває. Рослинні олії з насіння соняшника, кукурудзи, ріпаку та сої є основними джерелами натурального комерційного вітаміну Е з низькою активністю через низький вміст a-Т. В багатьох дослідженнях показано зростання накопичення a-T у клітинах рослин за зміни умов культивування: інтенсивності світла, фотоперіоду, рівня азоту, температури, типу вуглецевого живлення тощо. Стресові умови стимулюють накопичення антиоксидантів у фотосинтезуючих ор­ганізмах, але можуть обмежувати нормальну швидкість їх росту. Генна інженерія дає змогу створювати рослини з високим вмістом a-Т введенням кодувальних послідовностей (CDS) значущих генів шляху синтезу токохроманолу в ядерний геном трансгенних рослин. CDS кДНК ключових ферментів синтезу a-Т, таких як гомогентизатгеранілгеранілтрансфераза (HGGT), токоферолциклаза (TC), g-токоферолметилтрансфераза (g-MTM) з рису, сої, кукурудзи, моркви тощо, використовують для збільшення загального вмісту токохроманолів. Комбінуванням біотехнологічних методів, генної інженерії та добором умов культивування можна значно стимулювати накопичення a-Т у фотосинтезуючих організмах.

Ключові слова: a-токоферол, вітамін Е, токохроманол, біотехнологія, трансгенні рослини

Фізіологія рослин і генетика
2021, том 53, № 6, 484-500

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