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首页> 外文期刊>Plant Physiology and Biochemistry >Thiamine primed defense provides reliable alternative to systemic fungicide carbendazim against sheath blight disease in rice (Oryza sativa L.)
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Thiamine primed defense provides reliable alternative to systemic fungicide carbendazim against sheath blight disease in rice (Oryza sativa L.)

机译：硫胺素引发的防御提供了系统性杀真菌剂多菌灵替代水稻（Oryza sativa L.）鞘枯病的可靠替代品

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摘要

A novel pathogen defense strategy by thiamine priming was evaluated for its efficacy against sheath blight pathogen, Rhizoctonia solani AG-1A, of rice and compared with that of systemic fungicide, carbendazim (BCM). Seeds of semidwarf, high yielding, basmati rice variety Vasumati were treated with thiamine (50 mM) and BCM (4 mM). The pot cultured plants were challenge inoculated with R. solani after 40 days of sowing and effect of thiamine and BCM on rice growth and yield traits was examined. Higher hydrogen peroxide content, total phenolics accumulation, phenylalanine ammonia lyase (PAL) activity and superoxide dismutase (SOD) activity under thiamine treatment displayed elevated level of systemic resistance, which was further augmented under challenging pathogen infection. High transcript level of phenylalanine ammonia lyase (PAL) and manganese superoxide dismutase (MnSOD) validated mode of thiamine primed defense. Though minimum disease severity was observed under BCM treatment, thiamine produced comparable results, with 18.12 per cent lower efficacy. Along with fortifying defense components and minor influence on photosynthetic pigments and nitrate reductase (NR) activity, thiamine treatment significantly reduced pathogen-induced loss in photosynthesis, stomatal conductance, chlorophyll fluorescence, NR activity and NR transcript level. Physiological traits affected under pathogen infection were found signatory for characterizing plant's response under disease and were detectable at early stage of infection. These findings provide a novel paradigm for developing alternative, environmentally safe strategies to control plant diseases.
机译：通过硫胺素引发的一种新型病原体防御策略，评估了其对水稻鞘枯病病原体Rhizoctonia solani AG-1A的功效，并将其与系统性杀菌剂多菌灵（BCM）进行了比较。用硫胺素（50 mM）和BCM（4 mM）处理半矮麦，高产，印度香米品种Vasumati的种子。播种40天后，将盆栽植物用茄根红霉菌挑战接种，并检测硫胺素和BCM对水稻生长和产量性状的影响。在硫胺素处理下较高的过氧化氢含量，总酚类累积，苯丙氨酸氨裂合酶（PAL）活性和超氧化物歧化酶（SOD）活性显示出较高的全身抗性水平，在具有挑战性的病原体感染下进一步增强。苯丙氨酸氨裂合酶（PAL）和锰超氧化物歧化酶（MnSOD）的高转录水平验证了硫胺素引发的防御方式。尽管在BCM治疗下观察到最小的疾病严重程度，但硫胺素产生了可比的结果，疗效降低了18.12％。除强化防御成分和对光合色素和硝酸还原酶（NR）活性的较小影响外，硫胺素处理显着降低了病原体诱导的光合作用丧失，气孔导度，叶绿素荧光，NR活性和NR转录水平。发现在病原体感染下受影响的生理特征是表征植物在病害下的反应的标志，并且在感染的早期是可检测的。这些发现为开发替代的，环境安全的策略来控制植物病害提供了新的范例。

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