Considering the heavy losses caused by pear ring rot(Botryosphaeria berengeriana) disease, the potential biocontrol agent against B. berengeriana was isolated and characterized in this work. Bacteria, isolated from pe...Considering the heavy losses caused by pear ring rot(Botryosphaeria berengeriana) disease, the potential biocontrol agent against B. berengeriana was isolated and characterized in this work. Bacteria, isolated from pear orchard rhizosphere soil, were screened for the biological control of pear ring rot caused by B. berengeriana. Among them, strain L-1 showed noticeable inhibitory activities against B. berengeriana and six other commonly occurring postharvest pathogens. Molecular methods indicated strain L-1 was Bacillus amyloliquefaciens. The potential of strain L-1 as an effective biocontrol agent was further estimated. Results showed strain L-1 could successfully colonize in pear wounds, its colonies reached 142.35 folds on 4 days post inoculation, and maintained at a high level during storage. In addition, strain L-1 caused abnormal hyphae growth of B. berengeriana,and its inhibitory percentage against pear ring rot reached 76.55% in vivo on 11 days post inoculation. Strain L-1 significantly induced the peroxidase(POD) and catalase(CAT) activities and delayed the accumulation of malondialdehyde(MDA) in pears. What's more, strain L-1 did not impair the fruit quality. All these results suggest that B. berengeriana L-1 is a promising agent for the biocontrol of pear ring rot.展开更多
Background: The focus of recent research has been directed toward the probiotic potential of Bacillus amyloliquefaciens(BA) on the gut health of animals. However, little is known about BA's effects on piglets with...Background: The focus of recent research has been directed toward the probiotic potential of Bacillus amyloliquefaciens(BA) on the gut health of animals. However, little is known about BA's effects on piglets with intra-uterine growth retardation(IUGR). Therefore, this study investigated the effects of BA supplementation on the growth performance,intestinal morphology, inflammatory response, and microbiota of IUGR piglets.Methods: Eighteen litters of newborn piglets were selected at birth, with one normal birth weight(NBW) and two IUGR piglets in each litter(i.e., 18 NBW and 36 IUGR piglets in total). At weaning, the NBW piglet and one of the IUGR piglets were assigned to groups fed a control diet(i.e., the NBW-CON and IUGR-CON groups). The other IUGR piglet was assigned to a group fed the control diet supplemented with 2.0 g BA per kg of diet(i.e., IUGR-BA group). The piglets were thus distributed across three groups for a four-week period.Results: IUGR reduced the growth performance of the IUGR-CON piglets compared with the NBW-CON piglets. It was also associated with decreased vil us sizes, increased apoptosis rates, reduced goblet cel numbers, and an imbalance between pro-and anti-inflammatory cytokines in the smal intestine. Supplementation with BA improved the average daily weight gain and the feed efficiency of the IUGR-BA group compared with the IUGR-CON group(P < 0.05). The IUGR-BA group exhibited increases in the ratio of jejunal vil us height to crypt depth, in ileal vil us height, and in ileal goblet cel density. They also exhibited decreases in the numbers of jejunal and ileal apoptotic cel s and ileal proliferative cel s(P < 0.05). Supplementation with BA increased interleukin 10 content, but it decreased tumor necrosis factor alpha level in the smal intestines of the IUGR-BA piglets(P < 0.05). Furthermore, compared with the IUGR-CON piglets, the IUGR-BA piglets had less Escherichia coli in their jejunal digesta, but more Lactobacil us and Bifidobacterium in their ileal digesta(P < 0.05).Conclusions展开更多
对菌株Lh-1进行鉴定,并对其防治西瓜枯萎病的效果进行评价。通过形态观察、生理生化检测和16S r RNA基因同源性分析鉴定菌株Lh-1,测定其抑菌谱。设计盆栽试验来评价施用有机肥加Lh-1菌液(T2),施用有机肥(T1)和化肥(CK)3种处理的防治效...对菌株Lh-1进行鉴定,并对其防治西瓜枯萎病的效果进行评价。通过形态观察、生理生化检测和16S r RNA基因同源性分析鉴定菌株Lh-1,测定其抑菌谱。设计盆栽试验来评价施用有机肥加Lh-1菌液(T2),施用有机肥(T1)和化肥(CK)3种处理的防治效果。结果显示,将Lh-1鉴定为解淀粉芽胞杆菌。该菌对多种植物病原菌都有抑制作用具有广谱抗菌活性,尤其对西瓜枯萎病有良好的防治效果。盆栽试验表明添加Lh-1后发病率仅为17.2%,与对照相比防治效果达到78.5%,植株高度、鲜重和干重指标均为最高;瓜苗中的SOD、POD和CAT活性显著提高而MDA含量明显下降;瓜苗根际的微生物区系中细菌与放线菌含量上升,真菌特别是尖孢镰刀菌的数量下降,瓜苗根际微生物区系结构得到明显改善。解淀粉芽胞杆菌Lh-1能够防治西瓜枯萎病。展开更多
Background:Probiosis is considered a potential strategy to reduce antibiotics use and prevent postweaning diarrhea(PWD).This study investigated the effect of Bacillus amyloliquefaciens DSM25840 or Bacillus subtilis DS...Background:Probiosis is considered a potential strategy to reduce antibiotics use and prevent postweaning diarrhea(PWD).This study investigated the effect of Bacillus amyloliquefaciens DSM25840 or Bacillus subtilis DSM25841 supplementation on growth,health,immunity,intestinal functionality and microbial profile of post-weaning pigs after enterotoxigenic E.coli(ETEC)F4 challenge.Methods:Sixty-four post-weaning piglets(7748 g±643 g)were randomly al ocated to four groups:control basal diet(CO);CO+1.28×10~6 CFU/g of B.amyloliquefaciens(BAA);CO+1.28×10~6 CFU/g feed of B.subtilis(BAS);CO+1 g colistin/kg of feed(AB).At day(d)7,animals were chal enged with 10~5 CFU/m L of ETEC F4 ac O149 and then fol owed for fecal score and performance until d 21.Blood was col ected at d 6,d 12 and d 21 for immunoglobulins,at d 8 for acute phase proteins,at d 8 and d 21 for metabolomics analysis.Jejunum was sampled for morphometry,quantification of apoptosis,cel proliferation,neutral and acid mucine and Ig A secretory cel s,and microarray analysis at d 21.Jejunum and cecum contents were col ected for microbiota at d 21.Results:AB and BAS reduced the fecal score impairment compared to CO(P<0.05)at d 14.Body weight(BW),average daily weight gain(ADWG),average daily feed intake(ADFI)and gain to feed ratio(G:F)did not differ between Bacil us groups and CO.AB improved BW at d 7,d 14 and d 21,ADWG ADFI and G:F from d 0 to d 7(P<0.05).At d 8,CO had higher plasma arginine,lysine,ornithine,glycine,serine and threonine than other groups,and higher haptoglobin than AB(P<0.05).At d 21,CO had lower blood glycine,glutamine and Ig A than BAS.Morphology,cel s apoptosis and mucins did not differ.BAS and AB increased the vil us mitotic index.Transcriptome profile of BAS and AB were more similar than CO.Gene sets related to adaptive immune response were enriched in BAA,BAS and AB.CO had enriched gene set for nuclear structure and RNA processing.CO had a trend of higher Enterobacteriaceae in cecum than the other groups(P=0.06).Conclusion:Bacil us subtili展开更多
The effects of an exogenous probiotic( Bacillus amyloliquefaciens) on microbial community structure of B ranchionus plicatils and A rtemia sinica were evaluated in this study during turbot( Scophthalmus maximus) larva...The effects of an exogenous probiotic( Bacillus amyloliquefaciens) on microbial community structure of B ranchionus plicatils and A rtemia sinica were evaluated in this study during turbot( Scophthalmus maximus) larval breeding. The analysis and comparison of the microfloral composition of live feed with probiotic was conducted using the Illumina HiSeq PE250. The abundance of microbial species and diversity of microflora in live feed with B. amyloliquefaciens were higher than those in the control. The microfloral composition was similar among the three replicate experimental groups of B. plicatils compared with the control after enrichment. L actococcus, Pseudoalteromonas, and Alteromonas were always dominant. Additionally, some other bacterial species became dominant during the enrichment process. The microbial community during nutrient enrichment of A. sinica was rather similar among the three control replicates. Relative abundance of Cobetia sp., the most dominant species, was 54%–65.2%. Similarity in the microbial community was still high after adding B. amyloliquefaciens. Furthermore, P seudoalteromonas and Alteromonas replaced Cobetia as the dominant species, and the abundance of Cobetia decreased to 4.3%–25.3%. Mean common ratios at the operational taxonomic unit level were 50%–60% between the two B. plicatils and A. sinica treatments. Therefore, the microbial community structure changed after adding B. amyloliquefaciens during nutrient enrichment of B. plicatils or A. sinica and tended to stabilize. Additionally, the abundance of V ibrio in any kind of live feed was not significantly dif ferent from that in the control. These results will help improve the microflora of B. plicatils and A. sinica and can be used to understand the multiple-level transfer role of probiotic species among probiotic products, microflora of live feed, and fish larvae.展开更多
基金funded by the National Key Research and Development Program (2016YFD0400903-06)China Agriculture Research System (CARS-29-19)Chinese Academy of Agriculture Association, Agriculture Science and Technology Innovation Project (CAAS-ASTIP-2015-RIP-06)
文摘Considering the heavy losses caused by pear ring rot(Botryosphaeria berengeriana) disease, the potential biocontrol agent against B. berengeriana was isolated and characterized in this work. Bacteria, isolated from pear orchard rhizosphere soil, were screened for the biological control of pear ring rot caused by B. berengeriana. Among them, strain L-1 showed noticeable inhibitory activities against B. berengeriana and six other commonly occurring postharvest pathogens. Molecular methods indicated strain L-1 was Bacillus amyloliquefaciens. The potential of strain L-1 as an effective biocontrol agent was further estimated. Results showed strain L-1 could successfully colonize in pear wounds, its colonies reached 142.35 folds on 4 days post inoculation, and maintained at a high level during storage. In addition, strain L-1 caused abnormal hyphae growth of B. berengeriana,and its inhibitory percentage against pear ring rot reached 76.55% in vivo on 11 days post inoculation. Strain L-1 significantly induced the peroxidase(POD) and catalase(CAT) activities and delayed the accumulation of malondialdehyde(MDA) in pears. What's more, strain L-1 did not impair the fruit quality. All these results suggest that B. berengeriana L-1 is a promising agent for the biocontrol of pear ring rot.
基金provided by the National Science-Technology Support Plan Projects of China(No.2013BAD10B02–03)the Phase Ⅱ Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Background: The focus of recent research has been directed toward the probiotic potential of Bacillus amyloliquefaciens(BA) on the gut health of animals. However, little is known about BA's effects on piglets with intra-uterine growth retardation(IUGR). Therefore, this study investigated the effects of BA supplementation on the growth performance,intestinal morphology, inflammatory response, and microbiota of IUGR piglets.Methods: Eighteen litters of newborn piglets were selected at birth, with one normal birth weight(NBW) and two IUGR piglets in each litter(i.e., 18 NBW and 36 IUGR piglets in total). At weaning, the NBW piglet and one of the IUGR piglets were assigned to groups fed a control diet(i.e., the NBW-CON and IUGR-CON groups). The other IUGR piglet was assigned to a group fed the control diet supplemented with 2.0 g BA per kg of diet(i.e., IUGR-BA group). The piglets were thus distributed across three groups for a four-week period.Results: IUGR reduced the growth performance of the IUGR-CON piglets compared with the NBW-CON piglets. It was also associated with decreased vil us sizes, increased apoptosis rates, reduced goblet cel numbers, and an imbalance between pro-and anti-inflammatory cytokines in the smal intestine. Supplementation with BA improved the average daily weight gain and the feed efficiency of the IUGR-BA group compared with the IUGR-CON group(P < 0.05). The IUGR-BA group exhibited increases in the ratio of jejunal vil us height to crypt depth, in ileal vil us height, and in ileal goblet cel density. They also exhibited decreases in the numbers of jejunal and ileal apoptotic cel s and ileal proliferative cel s(P < 0.05). Supplementation with BA increased interleukin 10 content, but it decreased tumor necrosis factor alpha level in the smal intestines of the IUGR-BA piglets(P < 0.05). Furthermore, compared with the IUGR-CON piglets, the IUGR-BA piglets had less Escherichia coli in their jejunal digesta, but more Lactobacil us and Bifidobacterium in their ileal digesta(P < 0.05).Conclusions
文摘对菌株Lh-1进行鉴定,并对其防治西瓜枯萎病的效果进行评价。通过形态观察、生理生化检测和16S r RNA基因同源性分析鉴定菌株Lh-1,测定其抑菌谱。设计盆栽试验来评价施用有机肥加Lh-1菌液(T2),施用有机肥(T1)和化肥(CK)3种处理的防治效果。结果显示,将Lh-1鉴定为解淀粉芽胞杆菌。该菌对多种植物病原菌都有抑制作用具有广谱抗菌活性,尤其对西瓜枯萎病有良好的防治效果。盆栽试验表明添加Lh-1后发病率仅为17.2%,与对照相比防治效果达到78.5%,植株高度、鲜重和干重指标均为最高;瓜苗中的SOD、POD和CAT活性显著提高而MDA含量明显下降;瓜苗根际的微生物区系中细菌与放线菌含量上升,真菌特别是尖孢镰刀菌的数量下降,瓜苗根际微生物区系结构得到明显改善。解淀粉芽胞杆菌Lh-1能够防治西瓜枯萎病。
基金partly financially supported by Chr.Hansen A/S(Denmark).
文摘Background:Probiosis is considered a potential strategy to reduce antibiotics use and prevent postweaning diarrhea(PWD).This study investigated the effect of Bacillus amyloliquefaciens DSM25840 or Bacillus subtilis DSM25841 supplementation on growth,health,immunity,intestinal functionality and microbial profile of post-weaning pigs after enterotoxigenic E.coli(ETEC)F4 challenge.Methods:Sixty-four post-weaning piglets(7748 g±643 g)were randomly al ocated to four groups:control basal diet(CO);CO+1.28×10~6 CFU/g of B.amyloliquefaciens(BAA);CO+1.28×10~6 CFU/g feed of B.subtilis(BAS);CO+1 g colistin/kg of feed(AB).At day(d)7,animals were chal enged with 10~5 CFU/m L of ETEC F4 ac O149 and then fol owed for fecal score and performance until d 21.Blood was col ected at d 6,d 12 and d 21 for immunoglobulins,at d 8 for acute phase proteins,at d 8 and d 21 for metabolomics analysis.Jejunum was sampled for morphometry,quantification of apoptosis,cel proliferation,neutral and acid mucine and Ig A secretory cel s,and microarray analysis at d 21.Jejunum and cecum contents were col ected for microbiota at d 21.Results:AB and BAS reduced the fecal score impairment compared to CO(P<0.05)at d 14.Body weight(BW),average daily weight gain(ADWG),average daily feed intake(ADFI)and gain to feed ratio(G:F)did not differ between Bacil us groups and CO.AB improved BW at d 7,d 14 and d 21,ADWG ADFI and G:F from d 0 to d 7(P<0.05).At d 8,CO had higher plasma arginine,lysine,ornithine,glycine,serine and threonine than other groups,and higher haptoglobin than AB(P<0.05).At d 21,CO had lower blood glycine,glutamine and Ig A than BAS.Morphology,cel s apoptosis and mucins did not differ.BAS and AB increased the vil us mitotic index.Transcriptome profile of BAS and AB were more similar than CO.Gene sets related to adaptive immune response were enriched in BAA,BAS and AB.CO had enriched gene set for nuclear structure and RNA processing.CO had a trend of higher Enterobacteriaceae in cecum than the other groups(P=0.06).Conclusion:Bacil us subtili
基金Supported by the National Natural Science Foundation of China(No.31302206)the Postdoctoral Applied Research Project of Qingdao(No.Q51201607)
文摘The effects of an exogenous probiotic( Bacillus amyloliquefaciens) on microbial community structure of B ranchionus plicatils and A rtemia sinica were evaluated in this study during turbot( Scophthalmus maximus) larval breeding. The analysis and comparison of the microfloral composition of live feed with probiotic was conducted using the Illumina HiSeq PE250. The abundance of microbial species and diversity of microflora in live feed with B. amyloliquefaciens were higher than those in the control. The microfloral composition was similar among the three replicate experimental groups of B. plicatils compared with the control after enrichment. L actococcus, Pseudoalteromonas, and Alteromonas were always dominant. Additionally, some other bacterial species became dominant during the enrichment process. The microbial community during nutrient enrichment of A. sinica was rather similar among the three control replicates. Relative abundance of Cobetia sp., the most dominant species, was 54%–65.2%. Similarity in the microbial community was still high after adding B. amyloliquefaciens. Furthermore, P seudoalteromonas and Alteromonas replaced Cobetia as the dominant species, and the abundance of Cobetia decreased to 4.3%–25.3%. Mean common ratios at the operational taxonomic unit level were 50%–60% between the two B. plicatils and A. sinica treatments. Therefore, the microbial community structure changed after adding B. amyloliquefaciens during nutrient enrichment of B. plicatils or A. sinica and tended to stabilize. Additionally, the abundance of V ibrio in any kind of live feed was not significantly dif ferent from that in the control. These results will help improve the microflora of B. plicatils and A. sinica and can be used to understand the multiple-level transfer role of probiotic species among probiotic products, microflora of live feed, and fish larvae.
