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大量研究表明, 乙烯可激发植物对死体营养型真菌的抗性, 但我们前期研究发现, 乙烯合成前体ACC可提高小豆对活体营养型真菌——锈菌的抗性, 为初步明确其机制, 本研究分析了ACC处理对小豆乙烯合成及信号转导的影响, 结果表明, ACC处理显著提高了乙烯合成基因VaACS1及信号通路关键基因VaEIN2?VaEIN3?VaERF5的表达水平?此外, ACC处理后再接种锈菌, 小豆锈病的发病程度显著降低?对接种锈菌后不同时间VaPR2和VaPR4的表达分析表明, 相比ACC处理后不接种对照, ACC处理后再接种锈菌的处理, 接种后1~5 d这两个基因表达量显著升高; 与水处理不接种锈菌相比, 水处理接种锈菌5~8 d后VaPR2和VaPR4的表达量虽显著上调, 但应答时间较ACC处理滞后, 且总体表达水平低, 表明ACC激活乙烯通路进而诱导防卫反应基因上调表达是其诱导小豆抗锈性的关键? 相似文献
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Four common inducers, salicylic acid (SA), 1-aminocyclopropane-1-carboxylic acid (ACC), benzothiadiazole (BTH) and methyl jasmonate (MeJA), were selected to evaluate the effects of inducers on the resistance of adzuki bean to rust by investigating urediospores germination and the adzuki bean resistance to Uromyces vignae. The results showed that four inducers had no effects on the urediospores germination. However, they can significantly induce adzuki bean resistance to U. vignae. Among these four inducers, 0.25 mg·mL-1 ACC can significantly reduce the disease index, which was 45.06% lower than the control. Aditionally, seedlings treated with ACC exhibited a typical "triple reaction", which indicated that this induced resistance may relate with the endogenous ethylene biosynthesis in adzuki bean. Then the adzuki bean seedlings were treated with an ethylene receptor inhibitor, 1-methylcyclopropene (1-MCP) alone or combined with ACC. The results showed that 1-MCP alone had no significant effect on the growth and rust resistance of adzuki bean. However, 1-MCP could eliminate the "triple reaction" and did not affect the induced resistance caused by ACC when it used combined with ACC. Results obtained in current study suggested that ACC can significantly induce the resistance of adzuki bean to the rust. Moreover, we speculate that ACC-induced rust resistance of adzuki bean may not depend on ethylene signaling pathway. 相似文献
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为了明确绿豆叶斑病病原菌变灰尾孢菌(Cercospora canescens)分生孢子形成及萌发的最适条件,研究了变灰尾孢菌在9 种供试培养基上,在不同培养条件下分生孢子的产生及分生孢子的萌发情况。结果表明,在高粱粒培养基上25℃,光暗交替条件下培养10 天后即可产孢,培养14 天后产孢量可达9×105个/mL,玉米粉培养基和小麦粒培养基产孢较少,其他培养基不产孢。分生孢子在25℃、pH 6~7、连续黑暗条件下无菌水中培养20 h 后萌发率可达76.0%,不同温度、不同光照处理间萌发率差异显著。在蔗糖溶液和蛋白胨溶液中培养20 h 后萌发率分别达87.0%和86.3%。变灰尾孢菌的最适产孢条件为高粱粒培养基上25℃光暗交替培养;分生孢子最适萌发条件为25℃、pH 6~7、连续黑暗培养,蔗糖和蛋白胨可适当提高分生孢子的萌发率。 相似文献
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由豇豆单胞锈菌(Uromyces vignae Barclay)引起的小豆锈病是小豆生产中危害最为严重的病害之一,建立早期分子检测技术体系对病害早期诊断和及时防控具有重要意义。本研究以豇豆单胞锈菌ITS序列为依据设计引物,结合已报道的单胞锈菌属特异检测引物,以豇豆单胞锈菌为目标菌,以茄链格孢、茄丝核菌、禾谷镰刀菌、稻瘟菌、苹果轮纹病菌、半裸镰刀菌、玉米链格孢菌、尖孢镰刀菌和禾顶囊壳等9种常见植物病原真菌为参照菌,采用CTAB法提取上述各菌株的基因组DNA,应用普通PCR技术筛选出豇豆单胞锈菌的特异性检测引物UV-ITS,在此基础上设计巢式PCR引物UV-MX,构建了基于巢式PCR的高灵敏度小豆锈病分子检测体系。该巢式PCR体系在基因组DNA浓度仅为4×10-6 ng·μL-1时仍可实现有效扩增,其灵敏度是普通PCR的10万倍。以感病小豆品种‘宝清红’接种锈菌后不同时间的叶片为材料检验检测体系的应用效果发现,接种后12 h的小豆叶片样本即可扩增出豇豆单胞锈菌的特异性条带。本研究建立的小豆锈病分子检测体系特异性强、灵敏度高,具备对潜伏期病害进行早期诊断的应用潜力,可为小豆锈病的早期快速诊断和及时防控提供重要的技术支撑。 相似文献