Induced systemic resistance by fluorescent pseudomonads against red rot disease of sugarcane caused by Colletotrichum falcatum,Crop Protection

Abstract Certain strains of fluorescent Pseudomonas spp. were studied for their plant growth promoting attributes and induced systemic resistance (ISR) against red rot pathogen Colletotrichum falcatum Went in sugarcane. The fluorescent pseudomonad (FPs) strains were applied three times in the field, initially as a sett treatment while planting and two soil applications in the field using talc-based formulations. The ISR effect in the treated canes was assessed by artificial inoculation of the pathogen in the cane stalks. Some Pseudomonas strains significantly reduced red rot disease intensity in the sugarcane stalks. The Pseudomonas- mediated ISR was significantly higher in the disease susceptible cultivars than in the moderately resistant and moderately susceptible cultivars. When five Pseudomonas strains were evaluated for their efficacy against the disease in an endemic location, isolates CHAO, EP1 and Pf1 significantly reduced disease incidence. The tested strains significantly improved vegetative sett germination and crop growth in the field. Less pathogen induced invertase enzyme activity was recorded in cane tissues from bacteria treated stalks, and higher juice characters viz. sucrose per cent and sugar yield as compared to the untreated stalk tissues, after pathogen inoculation. The efficacy of certain Pseudomonas strains against red rot pathogen, enhanced the yield of cane and sugar and this suggests that these bacterial strains may have a role to play in the management of red rot disease in sugarcane.

中文翻译：

荧光假单胞菌对镰状炭疽菌引起的甘蔗红腐病的系统抗性

摘要 荧光假单胞菌属的某些菌株。研究了它们的植物生长促进特性和诱导系统抗性 (ISR) 对红腐病病原体 Colletotrichum falcatum 进入甘蔗。荧光假单胞菌 (FP) 菌株在田间施用 3 次，最初作为种植时的固定处理，并使用基于滑石粉的制剂在田间施用两次土壤。通过在甘蔗茎中人工接种病原体来评估处理过的甘蔗中的 ISR 效果。一些假单胞菌菌株显着降低了甘蔗茎中的红腐病强度。病害易感品种的假单胞菌介导的 ISR 显着高于中度抗性和中度易感品种。当评估五种假单胞菌菌株对地方性流行地区疾病的疗效时，分离株 CHAO、EP1 和 Pf1 显着降低了疾病发生率。测试的菌株显着改善了田间植物的发芽和作物生长。在来自细菌处理过的茎的甘蔗组织中记录到较少的病原体诱导的转化酶活性，以及​​更高的汁液特性，即。与未处理的茎组织相比，病原体接种后的蔗糖百分比和糖产量。某些假单胞菌菌株对红腐病病原体的功效提高了甘蔗和糖的产量，这表明这些细菌菌株可能在甘蔗红腐病的管理中发挥作用。测试的菌株显着改善了田间植物的发芽和作物生长。在来自细菌处理过的茎的甘蔗组织中记录到较少的病原体诱导的转化酶活性，以及​​更高的汁液特性，即。与未处理的茎组织相比，病原体接种后的蔗糖百分比和糖产量。某些假单胞菌菌株对红腐病病原体的功效提高了甘蔗和糖的产量，这表明这些细菌菌株可能在甘蔗红腐病的管理中发挥作用。测试的菌株显着改善了田间植物的发芽和作物生长。在来自细菌处理过的茎的甘蔗组织中记录到较少的病原体诱导的转化酶活性，以及​​更高的汁液特性，即。与未处理的茎组织相比，病原体接种后的蔗糖百分比和糖产量。某些假单胞菌菌株对红腐病病原体的功效提高了甘蔗和糖的产量，这表明这些细菌菌株可能在甘蔗红腐病的管理中发挥作用。与未处理的茎组织相比，病原体接种后的蔗糖百分比和糖产量。某些假单胞菌菌株对红腐病病原体的功效提高了甘蔗和糖的产量，这表明这些细菌菌株可能在甘蔗红腐病的管理中发挥作用。在病原体接种后，与未经处理的茎组织相比，蔗糖百分比和糖产量。某些假单胞菌菌株对红腐病病原体的功效提高了甘蔗和糖的产量，这表明这些细菌菌株可能在甘蔗红腐病的管理中发挥作用。

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