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Kosmos
|
2011
|
vol. 60
|
issue 1-2
173-177
PL
Bilirubina jest związkiem występującym w królestwie zwierząt, ale niedawno został wykryty u roślin wyższych. Chociaż biochemiczny szlak jej syntezy nie został jeszcze poznany, istnieją spekulacje co do jej funkcji fizjologicznej. Ten syntetyzowany na drodze szlaku tetrapiroli związek odpowiada za nadanie barwy organom reprodukcyjnym niektórych roślin. Przypuszcza się, że może on także działać jako antyoksydant. Chociaż nie wiele wiadomo o bilirubinie u roślin to jej odkrycie zrewolucjonizowało dotychczasowy stan wiedzy i skłania do prowadzenia dalszych badań nad innymi jeszcze funkcjami, które może pełnić w świecie roślin.
EN
Bilirubin-IXα was found as the main pigment in orange seed arils of the bird-of paradise tree Strelitzia nicolai and in sepals in Strelitzia reginae. It changed the idea that bilirubin is the compound which is only synthesized in animals. Bilirubin is present as the primary pigment synthesized in the tetrapirol pathway which functions to produce color in plants. Whether providing colour for plants is the only function of bilirubin or it may play other roles still needs elucidation.
EN
Karrikins (KAR, 3-methyl-2H-furo[2,3-c]pyran-2-one) are a new group of plant growth regulators detected in the smoke from burning of plant materials. These compounds stimulate seed germination of many plants growing in areas where fires occur regularly and frequently, but also break dormancy and stimulate germination and growth of plants from other ecosystems. The primary dormancy seeds of Arabidopsis thaliana are susceptible to KARs in smoke. This may indicate that KARs may also occur in environments other than those that are vulnerable to fires. It seems that KARs together with other important signal molecules, ABA and GA, are involved in breaking the dormancy and stimulating seed germination in the most favorable environmental conditions. However, until now the mechanism of action of these compounds is not clear.
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