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首页> 外文期刊>The Journal of Horticultural Science & Biotechnology >Seed treatment with benzothiadiazole induces resistance against powdery mildew disease caused by Sphaerotheca fuliginea and increases the activities of pathogenesis-related enzymes in cucumber plants
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Seed treatment with benzothiadiazole induces resistance against powdery mildew disease caused by Sphaerotheca fuliginea and increases the activities of pathogenesis-related enzymes in cucumber plants

机译：用苯并噻二唑进行种子处理可诱导对由满球白粉病引起的白粉病产生抗性，并增加黄瓜植物中与病程相关的酶的活性

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摘要

Applications of acibenzolar S-methyl (ASM), commercially known as Bion (R) WG 50 [benzothiadiazole (benzo 1, 2, 3) thiadiazole-7-carbothioic acid S-methyl ester], or Milsana (R) by seed imbibition were evaluated for their efficacy in protecting cucumber plants against powdery mildew caused by the biotrophic fungus, Sphaerotheca fuliginea. Among the different concentrations of ASM (0, 25, 50, 75, or 100 mu g a.i.ml(-1)) or Milsana (R) (10 or 20 ml l(-1)) tested, soaking seed in 75 mu g a.i.ml(-1) ASM for 12 h was the optimum concentration and duration to induce systemic acquired resistance (SAR) without adverse effects on seed germination or seedling vigour. Higher concentrations of ASM delayed the germination of cucumber seed, and longer durations of seed treatment negatively affected the seedling vigour index. Seed treatment with ASM increased the activities of pathogenesis-related (PR) proteins, but not treatment with Milsana (R). The activity of chitinase in cotyledons from ASM-treated seed increased six-fold compared to its activity in untreated (control) plant tissue. Longer durations of soaking with ASM significantly increased chitinase activity in shoot tissues, reaching a peak at 12 h before declining. The enhanced levels of chitinase and peroxidase activity elicited by seed treatment with ASM were similar to those triggered by foliar application of ASM alone, or by seed treatment followed by foliar application of ASM. The application of ASM by seed imbibition significantly reduced the severity of powdery mildew in cucumber cotyledon-disc assays. Increased resistance to powdery mildew in ASM seed-treated cucumber plants was positively correlated with the enhanced activities of PR proteins that are known to be associated with pathogen resistance in cucumber leaves. This research indicates that ASM may be applied as a seed treatment to protect cucumber seedlings against powdery mildew.
机译：通过种子吸收，应用商业上称为Bion（R）WG 50 [苯并噻二唑（苯并1、2、3）噻二唑-7-硫代甲酸S-甲酯]或Milsana（R）的种子通过吸收来施用。评估了其在保护黄瓜植物免受由生物营养真菌Sphaerotheca fuliginea引起的白粉病中的功效。在不同浓度的ASM（0、25、50、75或100μgaiml（-1））或Milsana（R）（10或20 ml l（-1））中，将种子浸入75μg aiml（-1）ASM持续12 h是诱导系统获得性抗性（SAR）而对种子发芽或幼苗活力没有不利影响的最佳浓度和持续时间。较高浓度的ASM会延迟黄瓜种子的发芽，而更长的种子处理时间会对幼苗活力指数产生负面影响。用ASM进行种子处理可增加与病程相关（PR）蛋白质的活性，但不能通过Milsana（R）处理。与未经处理（对照）植物组织中的子叶相比，来自ASM处理过的种子的子叶中几丁质酶的活性增加了六倍。用ASM浸泡更长的时间会显着增加芽组织中的几丁质酶活性，在下降前12 h达到峰值。通过ASM种子处理引发的几丁质酶和过氧化物酶活性增强水平与单独叶面施用ASM或种子处理然后叶面施用ASM引发的相似。通过种子吸收法应用ASM可显着降低黄瓜子叶圆盘检测中白粉病的严重程度。 ASM种子处理的黄瓜植株对白粉病的抗性增强与PR蛋白活性增强呈正相关，PR蛋白的活性与黄瓜叶片中的病原体抗性相关。这项研究表明，ASM可用作种子处理，以保护黄瓜幼苗免受白粉病的侵害。

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