Plant growth regulation activity of steviol and derivatives |
| |
Authors: | de Oliveira Brás Heleno Stiirmer Júlio César de Souza Filho José D Ayub Ricardo Antonio |
| |
Affiliation: | Universidade Federal do Paraná, Departamento de Química, Curitiba, PR, Brazil. bho@ufpr.br |
| |
Abstract: | This work describes the preparation of tetracyclic diterpenoids and determination of their plant growth regulator properties. Stevioside (2) was used as starting material and the derivatives 13-hydroxy-ent-kaur-16-en-19-oic acid (steviol, 3), ent-7alpha,13-dihydroxy-kaur-16-en-19-oic acid (4), 13-hydroxy, ent-kaur-16,17-epoxi-19-oic acid (steviol epoxide, 5), 17-hydroxy-16-ketobayeran-19-oic acid (17-hydroxyisosteviol, 6), 17-hydroxy-16-hydroxyiminobayeran-19-oic acid (7), 16-ketobayeran-19-oic acid (isosteviol, 9), 16,17-dihydroxybeyeran-19-oic acid (8), and 16-hydroxyiminobayeran-19-oic acid (isosteviol oxime, 10) were obtained by simple chemical procedures. Another derivative, ent-7alpha,13-dihydroxycaur-15-en-19-oic acid (4), was obtained by biotransformation of steviol (3) by Penicillium citrinum. In order to determine the plant growth regulator activity the compounds were submitted to the lettuce hypocotyl and barley aleurone bioassays. All compounds showed significant activities in both bioassays. Steviol (3) and isosteviol (9) were also tested in field-grown grapes resulting in an increase in berry weight and size. |
| |
Keywords: | Stevia rebaudiana Asteraceae Vitis vinifera Familia Vitaceae Plant growth regulator Diterpenoids Stevioside Steviol |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|