RESUMO
OBJECTIVES: To find glycine oxidase genes that can be applied to the breeding of glyphosate resistant crops. RESULTS: The glycine oxidase (GO, EC 1.4.3.19) gene (GenBank No: KC831746) from Bacillus licheniformis (B. licheniformis) was chemically synthesized and transformed into glyphosate-sensitive Escherichia coli (E. coli). The GO gene was transformed into Arabidopsis and rice through Agrobacterium-mediated transformation. The test results confirmed that transgenic plants containing GO genes are more resistant to glyphosate than wild-type plants. On solid Murashige and Skoog (MS) (Murashige and Skoog1962 ) medium containing 200 µM glyphosate, transgenic Arabidopsis thaliana grew normally, while wild-type plants were stunted and root growth was restricted. In a solution containing 500 µM glyphosate, wild-type rice showed severe yellowing, while transgenic rice grew normally. In addition, when sprayed with 10 mM glyphosate solution, wild-type rice withered and died, while transgenic rice grew well. The function of GO gene in glyphosate resistance and the application value of GO gene in the cultivation of glyphosate-resistant crops is proved. CONCLUSIONS: The glycine oxidase gene from B. licheniformis enhances the resistance of E. coli, Arabidopsis and rice to glyphosate.
Assuntos
Bacillus licheniformis , Resistência a Herbicidas , Herbicidas , Oryza , Plantas Geneticamente Modificadas , Arabidopsis/efeitos dos fármacos , Arabidopsis/genética , Bacillus licheniformis/enzimologia , Escherichia coli/genética , Herbicidas/toxicidade , Melhoramento Vegetal , Plantas Geneticamente Modificadas/efeitos dos fármacos , Plantas Geneticamente Modificadas/genética , Oryza/efeitos dos fármacos , Oryza/genética , GlifosatoRESUMO
Objective To study the effects of the genetically modified(GM) rice enriched with resistant starch on large bowel health in rats. Method Forty-eight healthy male SD rats were randomly assigned into four groups based on body weight,and given with no-GM rice diet (No-GM), GM rice diet(GM), half-GM rice diet (Half-GM) and normal diet (ND), respectively. After fed for 5 w, 4 d feces samples were collected. At 6 w all rats were killed and the contents of cecum and colon were collected. Large bowel function was evaluated by determination of cecum and colon weight, their contents, pH value, short-chain fatty acids (SCFA), etc. Results GM group had similar body weight with ND and significantly less than No-GM. Compared with No-GM and ND, fecal bulk and moisture, cecum and colon weight and the cecum contents of GM and Half-GM were higher dose-dependently. The contents of SCFA in cecum, colon and feces dropped gradually. SCFA level of cecum and colon was higher significantly in GM and Half-GM compared with No-GM and ND except butyric acid of colon in Half-GM. In all groups, there were differences of acetic and propionic acid level in feces but no difference of butyric acid. Cecum and fecal pH value of GM and Half-GM dropped much significantly compared with No-GM and ND. Conclusion The genetically modified rice enriched with resistant starch can improve the large bowel health of rat.
