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为研究不同十字花科植物提取物的抑菌活性，采用菌丝生长速率法，测定芥菜、茼蒿、甘蓝、油菜和雪里蕻提取物对草莓枯萎病原菌菌丝生长的抑制作用。结果表明，5种十字花科植物提取物均对草莓专化型尖孢镰刀菌有一定抑制作用，随提取物浓度降低，抑菌率呈现降低的趋势，浓度为1 g/mL时下提取物的抑菌率可达到73.13%～82.33%。通过毒力方程的测定，茼蒿的EC50为0.413 0 g/mL，对尖孢镰刀菌抑制效果最好，芥菜、雪里蕻和油菜EC50为0.473 5～0.491 5 g/mL，这3种植物提取液毒力相当，甘蓝的EC50最高，对病原菌抑制效果最弱。进一步可利用十字花科植物之间的化感作用合理安排与草莓轮、间作，减轻草莓枯萎病病害发生，为草莓枯萎病防治和植物源农药先导化合物的研发提供技术依据。 相似文献
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以黄花乌头根腐病病原菌为试材,研究了不同浓度的扑海因可湿性粉剂、多宁可湿性粉剂、甲托可湿性粉剂、多菌灵可湿性粉剂和多抗霉素可湿性粉剂对黄花乌头根腐病菌的抑菌作用。结果表明:当浓度为2 500μg/mL,50%扑海因可湿性粉剂和77%多宁可湿性粉剂对黄花乌头根腐病菌抑制作用最强,抑菌率为80%以上,而3%多抗霉素可湿性粉剂、50%多菌灵硫可湿性粉剂抑菌率在60%以上;当浓度为1 250μg/mL,50%多菌灵可湿性粉剂、77%多宁可湿性粉剂的抑菌率均在60%以上,其它药剂的抑菌效果不显著。所有以上药剂在833μg/mL浓度时的抑菌效果都不明显。 相似文献
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将戊唑醇、咯菌腈、烯酰吗啉、啶酰菌胺、苯醚甲环唑分别设置0.01μg/mL、0.1μg/mL、1μg/mL、5μg/mL、10μg/mL、100μg/mL浓度开展辣椒菌核病抑菌试验。试验结果表明,戊唑醇对辣椒菌核病菌的抑制率相对较高,其次为咯菌腈、啶酰菌胺、苯醚甲环唑,烯酰吗啉对辣椒菌核病菌的抑制效果相对较低。回归分析可知,戊唑醇对辣椒菌核病菌的ED50值为0.65μg/mL,表现低抗;苯醚甲环唑、啶酰菌胺对辣椒菌核病菌的ED50值分别为1.16786μg/mL和2.96226μg/mL,表现中抗;咯菌腈、烯酰吗啉对辣椒菌核病菌的ED50值分别为5.1999μg/mL和217.76μg/mL,表现高抗。 相似文献
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6种杀菌剂对苹果树腐烂病菌的毒力测定及田间防治效果 总被引：1，自引：0，他引：1
《中国果树》2018,(6)
采用生长速率法和涂抹法测定6种杀菌剂对苹果树腐烂病菌的室内毒力和田间防效。结果表明:室内毒力测定中,戊唑醇对苹果树腐烂病菌菌丝生长抑制作用较强,EC50值为0.0006μg/mL;其次为丙环唑,EC50值为0.073 7μg/mL;苯醚甲环唑、吡唑醚菌酯、甲基硫菌灵EC50值分别为0.570 9、0.583 3、0.608 8μg/mL;噻霉酮抑制作用较弱,EC50值为5.449 4μg/mL。田间防治试验中,1.6%噻霉酮涂抹剂原药涂抹病疤后,病斑复发率最低,为2.10%,防效为97.90%;其次为3%甲基硫菌灵糊剂125g/m~2涂抹病疤后,病斑复发率为9.09%,防效为90.91%。6种杀菌剂对苹果树腐烂病菌均有较好的抑制作用,生产中建议选用43%戊唑醇悬浮剂10倍液、3%甲基硫菌灵糊剂125 g/m2和1.6%噻霉酮涂抹剂原药等进行防治。 相似文献
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利用菌丝生长速率法,测定了18种化学杀菌剂对柑桔链格孢菌Alternaria citri的毒力。结果表明,70%丙森锌抑菌效果最好,EC50为0.247 5μg/mL;10%苯醚甲环唑效果次之,EC50为0.346 5μg/mL;其次为50%丙环唑、27.12%碱式硫酸铜、10%井冈霉素、40%氟硅唑、70%氢氧化铜、22%抑菌唑、1.5%噻霉酮、65%代森锰锌,EC50均在2.4μg/mL以下;其余药剂效果不理想,EC50在11μg/mL以上,尤其多菌灵效果最差,EC50为911.774 7μg/mL。 相似文献
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10种杀菌剂对柑桔黑斑病菌的室内毒力测定 总被引：2，自引：2，他引：0
利用菌丝生长速率法,测定了10种常用杀菌剂对柑桔黑斑菌的毒力。结果表明,50%醚菌酯抑菌效果最好,EC50为0.0199μg/mL;40%氟硅唑次之,EC50为0.0209μg/mL;其他依次为25%咪鲜胺、10%苯醚甲环唑、25%吡唑醚菌酯、70%农用链霉素、30%金核霉素、80%代森锰锌和70%甲基托布津,EC50分别为0.0323、0.1395、0.2475、0.3171、0.5041、1.8723和2.0760μg/mL;50%多菌灵抑菌效果最弱,EC50为4.3306μg/mL。 相似文献
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以咪鲜胺、咯菌腈、戊唑醇、异菌脲和腐霉利等为试验药剂,开展番茄枯萎病菌的抑菌试验,并对抑制效果好的药剂进行复配试验,筛选出对番茄枯萎病菌抑制效果好的浓度及复配比例。结果表明,咪鲜胺和咯菌腈对番茄枯萎病菌菌丝生长的抑制作用显著。0.1μg·mL-1咪鲜胺对枯萎病菌的抑菌率为73.8%,EC50为0.02μg·mL-1;0.1μg·mL-1咯菌腈对枯萎病菌的抑菌率为48.7%,EC50为0.17μg·mL-1。0.1μg·mL-1咪鲜胺和0.1μg·mL-1咯菌腈以体积比为2∶8进行复配时,抑制效果最佳,抑菌率为91.1%。研究结果对化学药剂的科学合理使用提供理论依据,为防治番茄枯萎病提供重要信息。 相似文献
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以分离筛选后的昭通乌天麻野生蜜环菌为试材,以PDA为基本培养基,研究了不同浓度NAA对昭通乌天麻野生蜜环菌菌丝出现时间、菌索出现时间、菌索长度、生物量以及生长状况的影响.结果表明;处理4(5.0μg/mL)的菌丝、菌索出现最快;处理1～5(0.5、1.0、2.5、5.0、10.0 μg/mL)菌索长度明显大于对照,处理6～9(25、50、100、250 μg/mL)菌索生长明显小于对照;最终的生物量以处理4(5.0 μg/mL)为最大;处理3(2.5μg/mL)和处理4(5.0 μg/mL)蜜环菌生长状况最好.综合比较来看,以处理4(5.0 μg/mL)为蜜环菌生长的最佳浓度.该研究为后续蜜环菌的培养、菌包生产以及研发奠定了一定的基础. 相似文献
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樟芝(Taiwanofungus camphoratus)发酵液和经95％乙醇浸提后的菌丝体醇提物分别用石油醚和氯仿进行分级提取,得到石油醚和氯仿提取物.对不同提取物进行体外抑制SPCA-1肺癌细胞增殖实验,发现各提取物均可抑制SPCA-1细胞的增殖,其中发酵液石油醚提取物抑制作用最好,IC5.为62.5 μg/mL,发酵液和菌丝体氯仿提取物的抑制作用较好,IC50分别为120.9和109.5 μg/mL,菌丝体石油醚提取物的抑制作用较差,在25～150 μg/mL作用浓度下,抑制率低于20％.各提取物对SPCA-1细胞凋亡和生长周期作用的测定结果表明,各提取物在肺癌细胞SPCA-1中通过诱导细胞凋亡及S期周期阻滞来表现其抑制作用. 相似文献
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猴头菌液体发酵条件的研究 总被引：15，自引：0，他引：15
本文报道了猴头菌适宜的液体发酵条件及发酵培养基。结果表明：猴头菌适宜发酵条件为：培养温度２５～２８℃，培养基起始ｐＨ５０～６０，摇瓶装量１００～１２０ｍＬ／５００ｍＬ，振荡频率１５０～１８０ｒ／ｍｉｎ，种子培养时间３～４ｄ，接种量１０％～１５％。适宜的发酵培养基为：小麦粉３％，酵母粉３％，ＫＨ２ＰＯ４０１％，ＭｇＳＯ４·７Ｈ２Ｏ００５％，ＶＢ１２０μｇ／１００ｍＬ，ＶＢ２２０μｇ／１００ｍＬ。 相似文献
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6种杀菌剂对猕猴桃主要腐烂病菌的室内毒力测定 总被引：1，自引：0，他引：1
葡萄座腔菌Botryosphaeria dothidea和拟茎点霉菌Phomopsis sp.是引起江西省奉新县猕猴桃果实腐烂的两种主要病原菌。本文采用菌丝生长速率法测定了6种杀菌剂的毒力,结果表明,75%肟菌酯.戊唑醇(拿敌稳)水分散粒剂、50%异菌脲(扑海因)悬浮剂、10%苯醚甲环唑(世高)水分散粒剂、70%甲基硫菌灵(甲基托布津)可湿性粉剂、60%吡唑醚菌酯.代森联(百泰)水分散粒剂等5种杀菌剂对葡萄座腔菌和拟茎点霉菌均有较强的毒力,对葡萄座腔菌的EC50值依次为0.143 9、0.150 2、0.179 5、0.264 0和0.946 6μg/mL;对拟茎点霉菌的EC50值依次为0.089 3、0.222 8、0.132 0、0.403 4和0.792 2μg/mL;50%醚菌酯(翠贝)水分散粒剂则对两种病菌的毒力很弱,对葡萄座腔菌和拟茎点霉菌的EC50值分别高达7 890.7和12 881.0μg/mL。 相似文献
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依次用95％乙醇和蒸馏水提取山茶靛牛肝菌(Boletus pseudoregius)子实体,再用不同有机溶剂萃取95％乙醇提取物,考察山茶靛牛肝菌子实体不同有机溶剂萃取物和水提物的体外抗肿瘤活性.结果表明:石油醚萃取物对白血病细胞K562抑制作用较弱,对人肠癌细胞SW620和人肝肿瘤细胞HepG-2的增殖有较强的抑制作用,IC50分别为95.7和195.4 μg/mL;正丁醇萃取物对K562、SW620和HepG-2的增殖都有较强的抑制作用,IC50分别为24.2、89.0和59.6 μg/mL;石油醚和正丁醇萃取物在实验浓度范围内对人正常前列腺基质永生化细胞WPMY-1的增殖无抑制作用;氯仿和乙酸乙酯萃取物对K562、SW620和HepG-2肿瘤细胞和WPMY-1正常细胞的增殖均有较强抑制作用,其中氯仿萃取物的抑制作用最强;水提物对以上3种肿瘤细胞抑制作用不明显,对正常细胞的增殖无抑制作用. 相似文献
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YE Xue-yi ZENG Yao-ying△ HUANG Xiu-yan WANG Tong ZANG Ning ZHOU Jian-guo LIN Chang-le 《园艺学报》2007,23(5):1008-1012
AIM: To study the effects of ［8-(diethylamino) octyl-3, 4, 5 -trimethoxybenzoate］ (TMB-8), an intracellular Ca2+ antagonist, on the activation, proliferation and cell-cycle distribution of the mouse T lymphocytes stimulated by concanvalin A (Con A) in vitro. METHODS: After stimulated with Con A, T cells were treated with different concentrations of TMB-8 alone and its combination with cyclosporine A (CsA). The expression of CD69, the early marker of CD3+ T cell activation, was measured by FACS. The proliferation-related index was determined by carboxyl fluorescin diacetate succinmidyl ester (CFDA-SE) flow cytometry. The cell-cycle distribution was analyzed by propidium iodide staining.RESULTS: After 6 h culture, the activation rate of CD69+ T cell in Con A group was (74.88±1.88)%. 10, 20 and 40 μmol/L of TMB-8 inhibited the expression of CD69 (P<0.01), especially in 40 μmol/L (52.55%±1.54%). After 48 h and 72 h culture, the PI of Con A group was 1.24±0.01, 2.05±0.07, respectively. TMB-8 with the concentration up to 5 μmol/L exerted a definite inhibitory effect on the proliferation with a maximal inhibition in 40 μmol/L(P<0.01). In the combination of 10 μmol/L of TMB-8 with 25 μg/L of CsA, an evident synergistic effect was observed (P<0.01). Moreover, the cell-cycle distribution analysis showed that after 48 h culture, the concentration of TMB-8 over 10 μmol/L showed an evident suppression in S phase.CONCLUSION: TMB-8 significantly inhibites the early steps of the Con A-induced T cell activation and proliferation, as well as the progression of T lymphocytes in S phase. 相似文献
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YE Wei HUANG Dong-sheng LIANG An-jing LI Chun-hai HU Bao-shan LV Hao-ran LIU Shang-li 《园艺学报》2008,24(9):1830-1834
AIM:To evaluate the biological roles of TNF-α on the cartilage endplate cells (chondrocytes). METHODS:The chondrocytes were isolated and harvested from the cartilage endplate of New Zealand rabbits and then the biological characteristics of cells were identified by methods such as toluidine blue staining for type Ⅱ collagen. After different concentrations of TNF-α were added to culture medium respectively, the rate of the proliferation of chondrocytes in different time was measured with MTT. The protein expressions of Bax, Bcl-2, Fas and caspase-3 were measured by immunocytochemistry. The changes of the mRNA of aggrecan and type Ⅱ collagen were measured by RT-PCR. RESULTS:The TNF-α at concentration of 50 μg/L and 100 μg/L decreased the rate of the proliferation on chondrocytes. Though TNF-α at concentrations of 10 μg/L and 50 μg/L increased the level of Bax, Fas and caspase-3, only 50 μg/L TNF-α decreased the level of Bcl-2. TNF-α at concentrations of 10 μg/L and 50 μg/L decreased the level of collagen IIa mRNA and only 50 μg/L TNF-α decreased the level of aggrecan. CONCLUSION:TNF-α not only inhibits the proliferation and the matrix synthesis in chondrocytes, but also increases the expression of pro-apoptotic factors in chondrocytes. 相似文献
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10种化合物对香蕉枯萎病菌的抑菌作用及对毒素钝化的效果 总被引：1，自引：0，他引：1
以香蕉枯萎病菌(Fusarium oxysporum f.sp.cubense)及其产生的毒素为供试材料,研究10种化合物在4种浓度下对香蕉枯萎病菌菌丝体生长、分生孢子萌发的抑制作用和对香蕉枯萎病菌毒素的钝化作用。结果表明,除NH4NO3外,供试化合物对香蕉枯萎病菌的菌丝体生长、分生孢子萌发及毒素均有不同程度的抑制作用,CuSO4在2～5g/L、FeSO4-7H2O在5g/L质量浓度范围内对菌丝的抑制效果最强,抑制率为100%。EDTA·Na2在5g/L质量浓度范围内对菌丝的抑制率为93.64%。FeSO4-7H2O、(NH4)2SO4-FeSO4-6H2O、KMnO4、CuSO4在0.5￣5g/L质量浓度范围内对分生孢子有明显的抑制效果,平均抑制率分别为97.73%、97.07%、90.98%、90.39%。CuSO4和KI在1￣5g/L的高质量浓度下均出现化合物中毒现象,在0.5g/L的质量浓度下钝化效果最好,分别达75%、67.05%。EDTA·Na2、Zn-SO4-7H2O和(NH4)2SO4-FeSO4-6H2O是在5g/L质量浓度下钝化效果最强,分别为100%,98%和93.99%。 相似文献
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LI Fei WANG Jing-feng NIE Ru-qiong LUO Nian-sang GENG Deng-feng YUAN Wo-liang XIE Shuang-lun LIN Yong-qing ZHAO Wen-jie 《园艺学报》2008,24(5):909-914
AIM: To investigate the effects of ox-LDL on TLR2 and TLR4 expression and production of TNF-α, IL-10, IL-12, NO and MDA in macrophages and to observe intervention effect of GW1929 in above procedure. METHODS: The mouse peritoneal macrophages were pretreated with ox-LDL (50 mg/L, 100 mg/L) and GW1929 (20 μmol/L) respectively for 24 h. The concentrations of MDA, NO-2/NO-3, TNF-α, IL-10 and IL-12 in the culture fluid were detected. Flow cytometry was used to observe TLR2 and TLR4 expressions after the mouse peritoneal macrophages were pretreated with ox-LDL (50 mg/L) and GW1929 (20 μmol/L) respectively for 6 h, 12 h, and 24 h. RESULTS: The concentrations of MDA, NO-2/NO-3, TNF-α and IL-10 in ox-LDL (50 mg/L, 100 mg/L) group were higher than those in control and GW1929 group obviously, but the concentrations of above index in ox-LDL (50 mg/L, 100 mg/L)+GW1929 group were lower than those in ox-LDL (50 mg/L, 100 mg/L) group apparently. No IL-12 in every group was detected. Expressions of TLR-2 in ox-LDL+GW1929 (6 h, 12 h, 24 h) group were lower than those in ox-LDL (6 h, 12 h, 24 h) group respectively. TLR-4 expressions in ox-LDL+GW1929 (12 h) were lower than those in ox-LDL (12 h) apparently. CONCLUSION: ox-LDL up-regulates TLR2 and TLR4 expressions and promotes the production of ROX, NO, TNF-α and IL-10 in macrophages. GW1929 is capable of inhibiting the above ox-LDL effects. 相似文献