ABSTRACT
Nitrogen is an important factor affecting crop yield, but excessive use of chemical nitrogen fertilizer has caused decline in nitrogen utilization and soil and water pollution. Reducing the utilization of chemical nitrogen fertilizers by biological nitrogen fixation (BNF) is feasible for green production of crops. However, there are few reports on how to have more ammonium produced by nitrogen-fixing bacteria (NFB) flow outside the cell. In the present study, the amtB gene encoding an ammonium transporter (AmtB) in the genome of NFB strain Kosakonia radicincitans GXGL-4A was deleted and the â³amtB mutant was characterized. The results showed that deletion of the amtB gene had no influence on the growth of bacterial cells. The extracellular ammonium nitrogen (NH4+) content of the â³amtB mutant under nitrogen-free culture conditions was significantly higher than that of the wild-type strain GXGL-4A (WT-GXGL-4A), suggesting disruption of NH4+ transport. Meanwhile, the plant growth-promoting effect in cucumber seedlings was visualized after fertilization using cells of the â³amtB mutant. NFB fertilization continuously increased the cucumber rhizosphere soil pH. The nitrate nitrogen (NO3-) content in soil in the â³amtB treatment group was significantly higher than that in the WT-GXGL-4A treatment group in the short term but there was no difference in soil NH4+ contents between groups. Soil enzymatic activities varied during a 45-day assessment period, indicating that â³amtB fertilization influenced soil nitrogen cycling in the cucumber rhizosphere. The results will provide a solid foundation for developing the NFB GXGL-4A into an efficient biofertilizer agent.
Subject(s)
Ammonium Compounds , Cucumis sativus , Nitrogen-Fixing Bacteria , Seedlings , Nitrogen/metabolism , Bacteria/metabolism , Soil/chemistry , Membrane Transport Proteins , Fertilizers/analysisABSTRACT
Three new flavonol triglycosides, kaempferol-3-O-alpha-L-rhamnopyranosyl-(1 --> 6)-beta-D-glucopyranosyl-(1 --> 3)-beta-D-glucopyranoside (1), quercetin-3-O-alpha-L-rhamnopyranosyl-(1 --> 6)-beta-D-glucopyranosyl-(1 --> 3)-beta-D-glucopyranoside (2), quercetin-3-O-alpha-L-rhamnopyranosyl-(1 --> 6)-beta-D-glucopyranosyl-(1 --> 2)-beta-D-glucopyranoside (3), together with the two known flavonol glycosides, kaempferol-3-O-alpha-L-rhamnopyranosyl-(1 --> 6)-beta-D-glucopyranoside and kaempferol-3-O-alpha-L-rhamnopyranosyl-(1 --> 6)-beta-D-glucopyranosyl-(1 --> 2)-beta-D-glucopyranoside, were isolated from the aerial parts of Derris trifoliata. Their structures were determined on the basis of chemical and spectroscopic analyses.
Subject(s)
Derris/chemistry , Flavonols/isolation & purification , Glucosides/isolation & purification , Glycosides/isolation & purification , Quercetin/analogs & derivatives , Flavonols/chemistry , Glucosides/chemistry , Glycosides/chemistry , Molecular Structure , Nuclear Magnetic Resonance, Biomolecular , Quercetin/chemistry , Quercetin/isolation & purificationABSTRACT
A new dihydrochalcone, 4'-hydroxy-4,2'-dimethoxy-dihydrochalcone, was isolated from Chinese dragon's blood, the red resin of Dracaena cochinchinensis. Its structure was established by spectrum analysis.
Subject(s)
Chalcones/isolation & purification , Dracaena/chemistry , Plants, Medicinal/chemistry , Chalcones/chemistry , Molecular Structure , Nuclear Magnetic Resonance, Biomolecular , Resins, Plant/chemistryABSTRACT
Five rotenoids named dehydrodeguelin, dehydrorotenone, 12a-hydroxy rotenone, tephrosin and 12alphabeta-hydroxyrot-2'-enonic acid were isolated from aerial parts of Derris trifoliata. All these compounds were isolated from this plant for the first time.
Subject(s)
Chromones/isolation & purification , Derris/chemistry , Plants, Medicinal/chemistry , Rotenone/isolation & purification , Chromones/chemistry , Plant Components, Aerial/chemistry , Rotenone/chemistryABSTRACT
A new acylated flavonol glycoside, kaempferol 3-O-[(6''''-feruloyl)-beta-D-glucopyranosyl-(1 --> 3)]-[alpha-L-rhamnopyranosyl-(1 --> 6)]-beta-D-glucopyranoside and two known cyclolignan glycosides, (+)-lyoniresinol-3alpha-O-beta-D-glucopyranoside and ( - )-lyoniresinol-3alpha-O-beta-D-glucopyranoside were isolated from n-BuOH extracts of the aerial parts of Derris triofoliata, their structures were determined from spectroscopic and chemical evidences.
Subject(s)
Anisoles/chemistry , Derris/chemistry , Flavonols/chemistry , Glycosides/chemistry , Glycosides/isolation & purification , Naphthalenes/chemistry , Acylation , Anisoles/isolation & purification , Flavonols/isolation & purification , Kaempferols/chemistry , Kaempferols/isolation & purification , Molecular Structure , Naphthalenes/isolation & purificationABSTRACT
The new triterpenoid taraxerol-3-beta-O-tridecyl ether was isolated from the aerial part of Derris triofoliata. The structure was established on the basis of spectral data.
