A novel phosphorus biofertilization strategy using cattle manure treated with phytase–nanoclay complexes     

Daniel Menezes-Blackburn  Milko A. Jorquera  Liliana Gianfreda  Ralf Greiner  María de la Luz Mora 《Biology and Fertility of Soils》2014,50(4):583-592

The aim of this work was to evaluate the treatment of cattle manure with phytases stabilized in allophanic nanoclays as a potential novel phosphorus (P) biofertilization technology for crops grown in volcanic soils (Andisol). Furthermore, because the optimal pH for commercial phytase catalysis does not match the natural pH of manure, a complementary experiment was set up to evaluate the effect of manure inoculation with an alkaline phytase-producing bacterium. Finally, phytase-treated soil, manure, and soil–manure mixtures were evaluated for their P-supplying capacity to wheat plants grown under greenhouse conditions. Treating cattle manure with phytases stabilized in nanoclays resulted in a significant (P?≤?0.05) increase of inorganic P in soil extracts (NaOH-EDTA and Olsen). The use of phytase-treated cattle manure increased dry weights by 10 % and the P concentration by 39 % in wheat plants grown under greenhouse conditions, which is equivalent to a P fertilizer rate of about 150 kg of P per hectare. The inoculation of cattle manure with β-propeller phytase-producing bacteria led to an ～10 % increase in inorganic P in the manure extracts. However, applying inoculated manure to soil did not significantly increase wheat yield or P acquisition responses. Our results suggest that the novel approach of incubating cattle manure with phytases stabilized in nanoclay enhances the organic P cycling and P nutrition of plants grown in P-deficient soils.  相似文献   

In-vitro assessment for the control of Fusarium species using a lactic acid bacterium isolated from yellow pitahaya(Selenicereus megalanthus(K. Schum. Ex Vaupel Moran))          下载免费PDF全文

Leidy J. VALENCIA-HERNÁNDEZ  Karina LÓPEZ-LÓPEZ  Eyder D. GÓMEZ-LÓPEZ  Liliana SERNACOCK  Cristobal N. AGUILAR 《农业科学学报》2021,20(1):159-167

The fungistatic activity of a lactic acid bacterium, which had been isolated from yellow pitahaya cultures, against fungi associated with basal rot(Fusarium oxysporum and Fusarium fujikuroi) was measured in the present study. Its activity was assessed in three fractions: fermented(S1), metabolic products(S2), and biomass(S3), using two fermentation substrates: Man Rogosa Sharpe agar(MRS) and potato dextrose agar(PDA). The bacterium was molecularly identified as Lactobacillus plantarum. S3 reduced F. fujikuroi growth by 100% over 48 h of fermentation, which occurred during the stationary phase of bacterial growth. The three fractions' fungistatic activity against F. fujikuroi depended on the substrate employed. The fermentation kinetic parameters for L. plantarum indicated that its specific growth rate was 0.46 h~(–1), with 93.63% substrate consumption, 0.045 kg kg~(–1) cell yield, and 0.54 kg kg~(–1) product yield. The kinetic parameters calculated will allow for bacteria production scaling. These in-vitro trials reveal L. plantarum's possible application as a biocontrol agent for diseases associated with Fusarium. However, further ex-vivo and in-vivo researches are required to demonstrate its behavior in crops.  相似文献   

Results of the follow-up of the former trichinosis patients from Brasov County – Romania     

Codruţa Nemet  Liliana Rogozea  Răzvan Dejica 《Veterinary parasitology》2009,159(3-4):320-323

The objective of the study was to monitor for a period of 2 years (at 1, 3, 6, 9, 12, and 24 months) a group of former trichinellosis patients (n = 699) registered in Bra?ov county before the initiation of the National Supervision and Control Programme for trichinellosis in humans. During the study, immediate complications up to 6 months from hospital release, and related complications occurring up to 24 months from hospital release were identified. Immediate complications were cardiovascular (31%), muscular (19%), neurological (18%), ophthalmic (17%), allergic (9%), respiratory (1%), and other (5%). Complications were more frequent in children from the studied group, even if the trichinellosis disease manifestation was mild or moderate. Complications were also more frequent in female as compared to male patients, and in urban areas as compared to rural environments. Paraclinical data showed eosinophilia in 8–22% of patients, GPT and GOT within normal limits, and hypoproteinemia in the case of 178 former patients (31%). Hypocalcaemia and hypomagnesaemia persisted in the case of 401 former patients (71%). Two months following illness, 53 (9.4%) of the former patients remained ill, and 26 of them had retired on medical grounds. Nine months following illness, 212 (37.8%) of the former patients reported fatigue, myalgia (especially in the inferior limbs), cardiovascular disorders, neurological, psychiatric, and allergic illnesses. After one year, 102 (18%) of the former patients reported improvements in asthenia, muscular pains, allergic reactions, hypertension, cardiac arrhythmia, and angina pectoris crises. Trichinosis in humans cannot be considered only an acute disease that, once properly treated, etiologically, pathogenically, and symptomatically improves, but it can also become a chronic illness.  相似文献