Universidad Nacional de Rı´o Cuarto, Enlace Rutas 8 y 36-Km, 603-5800 Rı´o Cuarto, Co´ rdoba, Argentina.
J Biosci. 2024;49.
Peanut is susceptible to many diseases; among them, peanut smut disease caused by is the most damaging, causing yield losses of 30%. Fungicide treatment is not effective to control this disease. In this scenario, biological control would be an alternative to diminish the disease. Systemic resistance induced by a biotic agent is known to be effective against a broad spectrum of pathogens. In this study we evaluated the effect of different inoculation strategies of sp. CHEP5, a peanut native strain, on peanut smut incidence and severity in field experiments. Peroxidase activity and accumulation of phenolic compounds were measured as changes associated with induced defensive traits. After three consecutive field trials, we found that sp. CHEP5 inoculation protects peanut from because incidence and severity were reduced in two field trials. Furthermore, bacterial inoculation in the furrow followed by foliar application around the date of peg development would be the best strategy to control the disease. In addition, a correlation was found between increase in plant phenolic content and decrease in smut disease parameters. Thereafter, we concluded that sp. CHEP5 may reduce smut as a result of plant defence response induction.
花生易患多种疾病；其中，由 引起的花生黑粉病危害最大，可导致产量损失 30%。杀菌剂处理对控制这种疾病无效。在这种情况下，生物防治可能是减少这种疾病的一种替代方法。生物制剂诱导的系统抗性被认为对广谱病原体有效。在这项研究中，我们评估了不同接种策略对花生黑粉病发病率和严重度的影响，实验中使用了一种花生本土菌株 sp. CHEP5。过氧化物酶活性和酚类化合物的积累作为与诱导防御特性相关的变化进行了测量。经过连续三次田间试验，我们发现 sp. CHEP5 接种可保护花生免受 的侵害，因为在两次田间试验中发病率和严重度均降低。此外，在垄沟中接种，然后在荚果发育日期前后进行叶面喷施是控制这种疾病的最佳策略。此外，还发现植物酚类含量的增加与黑粉病参数的减少之间存在相关性。因此，我们得出结论， sp. CHEP5 可能通过诱导植物防御反应来减少黑粉病。
