RESUMO
Gibberellin (GA) is a phytohormone that regulates various developmental processes during the plant life cycle. In this study, we identify a new GA agonist, diphegaractin, using a wheat cell-free based drug screening system with grape GA receptor. A GA-dependent interaction assay system using GA receptors and DELLA proteins from Vitis vinifera was constructed using AlphaScreen technology and cell-free produced proteins. From the chemical compound library, diphegaractin was found to enhance the interactions between GA receptors and DELLA proteins from grape in vitro. In grapes, we found that diphegaractin induces elongation of the bunch and increases the sugar concentration of grape berries. Furthermore, diphegaractin shows GA-like activity, including promotion of root elongation in lettuce and Arabidopsis, as well as reducing peel pigmentation and suppressing peel puffing in citrus fruit. To the best of our knowledge, this study is the first to successfully identify a GA receptor agonist showing GA-like activity in agricultural plants using an in vitro molecular-targeted drug screening system.
Assuntos
Arabidopsis , Giberelinas , Giberelinas/farmacologia , Sistema Livre de Células , Reguladores de Crescimento de Plantas , Bioensaio , AgriculturaRESUMO
This study was performed to evaluate the effect of maternal supplementation with seaweed powder (SWP) on the immune status of piglets. Sows were supplementary fed SWP from 85-days of gestation until delactation. Forty-days old piglets were euthanized and lymphocyte subsets were analyzed. The results showed a significantly higher relative population of CD4+CD8+ T cells in the thymus, lymph node, tonsil (P<0.05), peripheral blood mononuclear cells, spleen and liver (P<0.01) of piglets derived from treated sows. A higher relative population of CD8+ T cells was also observed in the liver and spleen (P<0.05) of the piglets. The data suggested the enhancing effects of maternal supplementation with SWP on immune status of piglets.