本文主要研究内容
作者牛红杰(2019)在《黄瓜枯萎病生防放线菌的分离筛选及其发酵工艺研究》一文中研究指出:黄瓜枯萎病是由尖孢镰刀菌黄瓜专化型(Fusarium oxysporum f.sp.cucumerinum,FOC)引起的世界范围内的土传病害,危害严重。生物防治是该病害的重要防治手段,本研究旨在寻找防治黄瓜枯萎病并促进植物生长的多功能生防放线菌。放线菌的分离和拮抗测定。本研究采用梯度稀释法,从包括21份蔬菜地土样、6份堆肥样品、5份蔬菜样品和7份药用植物样品共39份样品中分离到493株放线菌。通过平板对峙和挥发性物质抑菌实验,获得拮抗带大于18mm的拮抗菌株27株,其中菌株HNMH-3-1、HNSG-4-2和HS57对FOC菌落扩展的抑制率分别为79.2%,67.6%和52.4%。初步将该三株菌分别鉴定为S.parvus,S.nigrescens或S.lydicus和S.nigrescens或S.lydicus。拮抗放线菌的防病促生效果评价。温室实验表明,孢子浓度为1×107CFU/mL的菌株HNSG-4-2、1×106CFU/mL的菌株HNMH-3-1和1×107CFU/mL的菌株HS57对黄瓜枯萎病防病效果较好,分别为97.9%、63.3%和51.0%。菌株HNSG-4-2和HNMH-3-1在孢子浓度为107CFU/mL时对苗的促生作用最好;与对照相比,菌株HNSG-4-2在孢子浓度为107CFU/mL时使黄瓜茎粗、苗干重、根干重分别增加93.1%、102.0%、166.7%;菌株HNMH-3-1使黄瓜株高、苗干重和根干重分别增加了71.5%、41.8%和100.0%。拮抗放线菌HS57的发酵工艺研究。为实现大规模工业化生产目的,对菌株HS57液体发酵产孢培养基和发酵工艺进行研究。最适有机氮源、碳源、无机盐分别为豆粕粉、可溶性淀粉和MgSO4?7H2O。发酵液物料的粗细影响菌株HS57菌丝生长和产孢,850?m的细物料更有利于产孢。发酵结束时pH大于7.8,调酸后不能提高孢子存活能力;但发酵液离心后重悬于无菌水中,孢子存活量可达初始水平。将HS57发酵液离心重悬后,与硅藻土或硅藻土与稻壳粉混和物(体积比为2:1)吸附制成的固体菌剂对孢子存活无不利影响,孢子量为109CFU/g。菌剂的干燥温度显著影响孢子存活,室温(20-24℃)干燥比40℃干燥处理的孢子存活量高。菌剂在4℃、室温(10-20℃)和26℃下贮存6个月的孢子存活量表明,4℃低温或室温更有利于孢子存活,6个月后活孢子量分别下降3倍和22倍,而26℃下保存的活孢子量下降52倍。综上所述,菌株HS57是一株具枯萎病菌拮抗性能、促生能力、适于大规模生产的高潜力生防菌株。
Abstract
huang gua ku wei bing shi you jian bao lian dao jun huang gua zhuan hua xing (Fusarium oxysporum f.sp.cucumerinum,FOC)yin qi de shi jie fan wei nei de tu chuan bing hai ,wei hai yan chong 。sheng wu fang zhi shi gai bing hai de chong yao fang zhi shou duan ,ben yan jiu zhi zai xun zhao fang zhi huang gua ku wei bing bing cu jin zhi wu sheng chang de duo gong neng sheng fang fang xian jun 。fang xian jun de fen li he jie kang ce ding 。ben yan jiu cai yong ti du xi shi fa ,cong bao gua 21fen shu cai de tu yang 、6fen dui fei yang pin 、5fen shu cai yang pin he 7fen yao yong zhi wu yang pin gong 39fen yang pin zhong fen li dao 493zhu fang xian jun 。tong guo ping ban dui shi he hui fa xing wu zhi yi jun shi yan ,huo de jie kang dai da yu 18mmde jie kang jun zhu 27zhu ,ji zhong jun zhu HNMH-3-1、HNSG-4-2he HS57dui FOCjun la kuo zhan de yi zhi lv fen bie wei 79.2%,67.6%he 52.4%。chu bu jiang gai san zhu jun fen bie jian ding wei S.parvus,S.nigrescenshuo S.lydicushe S.nigrescenshuo S.lydicus。jie kang fang xian jun de fang bing cu sheng xiao guo ping jia 。wen shi shi yan biao ming ,bao zi nong du wei 1×107CFU/mLde jun zhu HNSG-4-2、1×106CFU/mLde jun zhu HNMH-3-1he 1×107CFU/mLde jun zhu HS57dui huang gua ku wei bing fang bing xiao guo jiao hao ,fen bie wei 97.9%、63.3%he 51.0%。jun zhu HNSG-4-2he HNMH-3-1zai bao zi nong du wei 107CFU/mLshi dui miao de cu sheng zuo yong zui hao ;yu dui zhao xiang bi ,jun zhu HNSG-4-2zai bao zi nong du wei 107CFU/mLshi shi huang gua jing cu 、miao gan chong 、gen gan chong fen bie zeng jia 93.1%、102.0%、166.7%;jun zhu HNMH-3-1shi huang gua zhu gao 、miao gan chong he gen gan chong fen bie zeng jia le 71.5%、41.8%he 100.0%。jie kang fang xian jun HS57de fa jiao gong yi yan jiu 。wei shi xian da gui mo gong ye hua sheng chan mu de ,dui jun zhu HS57ye ti fa jiao chan bao pei yang ji he fa jiao gong yi jin hang yan jiu 。zui kuo you ji dan yuan 、tan yuan 、mo ji yan fen bie wei dou po fen 、ke rong xing dian fen he MgSO4?7H2O。fa jiao ye wu liao de cu xi ying xiang jun zhu HS57jun si sheng chang he chan bao ,850?mde xi wu liao geng you li yu chan bao 。fa jiao jie shu shi pHda yu 7.8,diao suan hou bu neng di gao bao zi cun huo neng li ;dan fa jiao ye li xin hou chong xuan yu mo jun shui zhong ,bao zi cun huo liang ke da chu shi shui ping 。jiang HS57fa jiao ye li xin chong xuan hou ,yu gui zao tu huo gui zao tu yu dao ke fen hun he wu (ti ji bi wei 2:1)xi fu zhi cheng de gu ti jun ji dui bao zi cun huo mo bu li ying xiang ,bao zi liang wei 109CFU/g。jun ji de gan zao wen du xian zhe ying xiang bao zi cun huo ,shi wen (20-24℃)gan zao bi 40℃gan zao chu li de bao zi cun huo liang gao 。jun ji zai 4℃、shi wen (10-20℃)he 26℃xia zhu cun 6ge yue de bao zi cun huo liang biao ming ,4℃di wen huo shi wen geng you li yu bao zi cun huo ,6ge yue hou huo bao zi liang fen bie xia jiang 3bei he 22bei ,er 26℃xia bao cun de huo bao zi liang xia jiang 52bei 。zeng shang suo shu ,jun zhu HS57shi yi zhu ju ku wei bing jun jie kang xing neng 、cu sheng neng li 、kuo yu da gui mo sheng chan de gao qian li sheng fang jun zhu 。
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论文作者分别是来自中国农业科学院的牛红杰,发表于刊物中国农业科学院2019-07-05论文,是一篇关于黄瓜枯萎病论文,放线菌论文,分离论文,筛选论文,发酵论文,中国农业科学院2019-07-05论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自中国农业科学院2019-07-05论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。