本文主要研究内容
作者李雪婷(2019)在《菌株S17-377的鉴定及其对水稻纹枯病防治作用机制的研究》一文中研究指出:本研究旨在从健康水稻植株的根际土壤中分离和筛选对水稻纹枯病具有良好防治效果的生防细菌,并对其进行鉴定、发酵条件优化和生防作用机制的初步研究。主要研究结果如下:从我国9个地区采集的45份水稻根际土壤样品中获得390株细菌分离物。通过平板对峙法,筛选出28株对水稻纹枯病菌有抑制效果的菌株,其中抑菌效果最佳的为菌株S17-377,抑菌带宽达10 mm。根据形态学和分子生物学特征,S17-377被鉴定为吡咯伯克霍尔德氏菌(Burkholderia pyrrocinia)。菌株S17-377的无菌滤液与PDA培养基混合制板,混合比例为1:20,1:10,1:5时对水稻纹枯病病菌菌丝的生长抑制率分别为77.14%、86.92%和98.26%,且能抑制菌核的形成。无菌滤液可导致水稻纹枯病菌的部分菌丝膨胀、皱缩和断裂。S17-377对草莓灰霉病菌(Botrytis cinerea)、稻瘟病菌(Magnaporthe grisea)和棉花黄萎病菌(Verticillium dahliae Kleb)等14种病原真菌的抑菌率为22.50%-90.90%;对柑橘溃疡病菌(Xanthomonas axonopodis pv.citri)、魔芋软腐病菌(Ervinia carotovora)、黄瓜角斑病菌(Pseudomonas syringae pv.lachrymans)和生姜青枯病菌(Ralstonia solanacearum)病原细菌的抑菌圈达9.75mm-13.14mm。离体防效实验结果显示菌株S17-377处理后水稻叶片无任何伤害,发病面积减少了84%。盆栽实验结果表明菌株S17-377发酵液对水稻植株处理三次后,对纹枯病的防效为65.93%。菌株S17-377在培养基为基础盐培养基,pH为5.0,培养时间为120 h或144h时,抑菌活性最强。S17-377发酵液对水稻植株具有较强的的抗病诱导效果,处理后水稻叶鞘的PAL和POD活性呈上升趋势,PPO活性呈先上升后下降的趋势。此外,S17-377还可激活水稻防御基因(NH1、PR1a、PR10、PAL/ZB8、LOX、AOS2)的表达。生防菌S17-377可产生蛋白酶、几丁质酶和嗜铁素,但不能产生纤维素酶。菌株S17-377可形成生物膜,形成的强度与细菌的浓度有关,浓度为OD600=0.6时的生物膜强度显著大于浓度为OD600=0.8、1.0。通过绿色荧光蛋白基因标记获得标记菌株S17-377GFP,转化后菌株S17-377GFP和原始菌株S17-377形态一致、生长差异不明显、遗传稳定性达75%以上,且不影响其对水稻纹枯病菌的抑菌作用。通过荧光显微镜观察发现,菌株S17-377GFP可定殖于水稻叶表皮、叶肉细胞和维管束中。菌株S17-377的抑菌活性物质对温度并不敏感。采用盐酸沉淀、硫酸铵沉淀及有机溶剂萃取法粗提生防菌株的活性成分,发现正丁醇粗提物、蛋白类粗提物和脂肽类粗提物(浓度为50μg/mL)对水稻纹枯病菌的的抑菌率分别为95.23%、94.43%、75.11%,其中正丁醇粗提物对纹枯病菌的EC50为8.95μg/mL。通过GC-MS检测正丁醇提取物,发现粗提物中含有38种化合物,其中匹配度高达90%以上的化合物有7种,9-甲基-十九烷、甘氨酸-L-脯氨酸、正十七烷、邻苯二甲酸二丁酯、棕榈酸、邻苯二甲酸二(2-乙基己)酯、烟碱。其化学式分别为:C20H42、C7H10N2O2、C17H36、C16H22O4、C16H32O2、C24H38O4、C10H14N2。
Abstract
ben yan jiu zhi zai cong jian kang shui dao zhi zhu de gen ji tu rang zhong fen li he shai shua dui shui dao wen ku bing ju you liang hao fang zhi xiao guo de sheng fang xi jun ,bing dui ji jin hang jian ding 、fa jiao tiao jian you hua he sheng fang zuo yong ji zhi de chu bu yan jiu 。zhu yao yan jiu jie guo ru xia :cong wo guo 9ge de ou cai ji de 45fen shui dao gen ji tu rang yang pin zhong huo de 390zhu xi jun fen li wu 。tong guo ping ban dui shi fa ,shai shua chu 28zhu dui shui dao wen ku bing jun you yi zhi xiao guo de jun zhu ,ji zhong yi jun xiao guo zui jia de wei jun zhu S17-377,yi jun dai kuan da 10 mm。gen ju xing tai xue he fen zi sheng wu xue te zheng ,S17-377bei jian ding wei bi ge bai ke huo er de shi jun (Burkholderia pyrrocinia)。jun zhu S17-377de mo jun lv ye yu PDApei yang ji hun ge zhi ban ,hun ge bi li wei 1:20,1:10,1:5shi dui shui dao wen ku bing bing jun jun si de sheng chang yi zhi lv fen bie wei 77.14%、86.92%he 98.26%,ju neng yi zhi jun he de xing cheng 。mo jun lv ye ke dao zhi shui dao wen ku bing jun de bu fen jun si peng zhang 、zhou su he duan lie 。S17-377dui cao mei hui mei bing jun (Botrytis cinerea)、dao wen bing jun (Magnaporthe grisea)he mian hua huang wei bing jun (Verticillium dahliae Kleb)deng 14chong bing yuan zhen jun de yi jun lv wei 22.50%-90.90%;dui gan ju hui yang bing jun (Xanthomonas axonopodis pv.citri)、mo yu ruan fu bing jun (Ervinia carotovora)、huang gua jiao ban bing jun (Pseudomonas syringae pv.lachrymans)he sheng jiang qing ku bing jun (Ralstonia solanacearum)bing yuan xi jun de yi jun juan da 9.75mm-13.14mm。li ti fang xiao shi yan jie guo xian shi jun zhu S17-377chu li hou shui dao xie pian mo ren he shang hai ,fa bing mian ji jian shao le 84%。pen zai shi yan jie guo biao ming jun zhu S17-377fa jiao ye dui shui dao zhi zhu chu li san ci hou ,dui wen ku bing de fang xiao wei 65.93%。jun zhu S17-377zai pei yang ji wei ji chu yan pei yang ji ,pHwei 5.0,pei yang shi jian wei 120 hhuo 144hshi ,yi jun huo xing zui jiang 。S17-377fa jiao ye dui shui dao zhi zhu ju you jiao jiang de de kang bing you dao xiao guo ,chu li hou shui dao xie qiao de PALhe PODhuo xing cheng shang sheng qu shi ,PPOhuo xing cheng xian shang sheng hou xia jiang de qu shi 。ci wai ,S17-377hai ke ji huo shui dao fang yu ji yin (NH1、PR1a、PR10、PAL/ZB8、LOX、AOS2)de biao da 。sheng fang jun S17-377ke chan sheng dan bai mei 、ji ding zhi mei he shi tie su ,dan bu neng chan sheng qian wei su mei 。jun zhu S17-377ke xing cheng sheng wu mo ,xing cheng de jiang du yu xi jun de nong du you guan ,nong du wei OD600=0.6shi de sheng wu mo jiang du xian zhe da yu nong du wei OD600=0.8、1.0。tong guo lu se ying guang dan bai ji yin biao ji huo de biao ji jun zhu S17-377GFP,zhuai hua hou jun zhu S17-377GFPhe yuan shi jun zhu S17-377xing tai yi zhi 、sheng chang cha yi bu ming xian 、wei chuan wen ding xing da 75%yi shang ,ju bu ying xiang ji dui shui dao wen ku bing jun de yi jun zuo yong 。tong guo ying guang xian wei jing guan cha fa xian ,jun zhu S17-377GFPke ding shi yu shui dao xie biao pi 、xie rou xi bao he wei guan shu zhong 。jun zhu S17-377de yi jun huo xing wu zhi dui wen du bing bu min gan 。cai yong yan suan chen dian 、liu suan an chen dian ji you ji rong ji cui qu fa cu di sheng fang jun zhu de huo xing cheng fen ,fa xian zheng ding chun cu di wu 、dan bai lei cu di wu he zhi tai lei cu di wu (nong du wei 50μg/mL)dui shui dao wen ku bing jun de de yi jun lv fen bie wei 95.23%、94.43%、75.11%,ji zhong zheng ding chun cu di wu dui wen ku bing jun de EC50wei 8.95μg/mL。tong guo GC-MSjian ce zheng ding chun di qu wu ,fa xian cu di wu zhong han you 38chong hua ge wu ,ji zhong pi pei du gao da 90%yi shang de hua ge wu you 7chong ,9-jia ji -shi jiu wan 、gan an suan -L-fu an suan 、zheng shi qi wan 、lin ben er jia suan er ding zhi 、zong lv suan 、lin ben er jia suan er (2-yi ji ji )zhi 、yan jian 。ji hua xue shi fen bie wei :C20H42、C7H10N2O2、C17H36、C16H22O4、C16H32O2、C24H38O4、C10H14N2。
论文参考文献
论文详细介绍
论文作者分别是来自长江大学的李雪婷,发表于刊物长江大学2019-09-04论文,是一篇关于水稻纹枯病论文,生防细菌论文,抑菌论文,防效论文,长江大学2019-09-04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,资料来自长江大学2019-09-04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。
标签:水稻纹枯病论文; 生防细菌论文; 抑菌论文; 防效论文; 长江大学2019-09-04论文;