Common bacterial blight (CBB), caused by Xanthomonas axonopodis pv. phaseoli var. fuscans (Xapf), negatively impact common bean production globally. Considering the potential of phosphites to protect plants against different diseases, this study investigated the potential of using manganese (Mn) and zinc (Zn) phosphites in common bean for CBB control. Plants were inoculated with Xapf 48 hr after being sprayed with water (control) and solutions (7.5 ml/L) of Mn and Zn phosphites. The area under common bacterial blight progress curve (AUCBBPC) was significantly lower by 34% and 59% for Mn and Zn phosphite treatments in comparison with the control treatment. The AUCBBPC was significantly reduced by 38% for Zn phosphite‐sprayed plants compared to Mn phosphite treatment. Phosphite‐sprayed plants displayed higher values for area under the curves of net CO₂ assimilation rate, stomatal conductance to water vapour, transpiration rate and internal‐to‐ambient CO₂ concentration ratio than non‐sprayed plants. This indicates the effect of Mn and Zn phosphites in attenuating the photochemical dysfunctions caused by Xapf infection. Moreover, plants sprayed with Mn phosphite displayed higher values for area under the curves of efficiency in capturing the excitation energy of open reaction centres of PSII and electron transport rate than those non‐sprayed indicating their capacity to preserve the capture and the use of the collected energy more efficiently. Lower AUCBBPC for Zn phosphite‐sprayed plants resulted in higher concentrations of total chlorophylls. The Zn phosphite‐sprayed plants showed higher values for area under the curves of β‐1,3‐glucanase, phenylalanine ammonia‐lyase, polyphenoloxidase, ascorbate peroxidase and superoxide dismutase activities. The Zn phosphite spray primed the plants to enhance their defence response and antioxidant capacity to reduce Xapf‐triggered oxidative stress with the preservation of the photosynthetic apparatus more efficiently.

中文翻译：

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锰和锌的亚磷酸盐增强了普通豆抵抗黄原体黄单胞菌感染的能力。菜豆

普通细菌性枯萎病（CBB），由Xanthomonas axonopodis pv引起。菜豆变种 fuscans（Xapf）对全球普通豆产量产生负面影响。考虑到亚磷酸盐保护植物免受不同疾病侵害的潜力，本研究调查了在普通豆中使用锰（Mn）和锌（Zn）亚磷酸盐控制CBB的潜力。用Xapf接种植物用水（对比例）和亚磷酸锰和亚磷酸锌溶液（7.5 ml / L）喷雾后48小时。与对照相比，亚锰酸锌和亚磷酸锌处理的常见细菌疫病进展曲线下面积（AUCBBPC）分别降低了34％和59％。与亚磷酸锰处理相比，喷施亚磷酸锌的植物的AUCBBPC明显降低了38％。亚磷酸盐喷洒的植物在净CO ₂同化率，气孔对水蒸气的电导率，蒸腾速率和内部-环境CO ₂浓度比的曲线下显示出更高的面积值。这表明亚磷酸锰和锌在减轻Xapf引起的光化学功能障碍方面的作用感染。此外，喷洒亚磷酸锰的植物在捕获PSII的开放反应中心的激发能和电子传输速率的效率曲线下的面积比未喷洒的植物显示出更高的面积值，表明它们保留了捕集和利用收集物的能力能源效率更高。亚磷酸锌喷洒植物的AUCBBPC较低，导致总叶绿素浓度较高。在β -1,3-葡聚糖酶，苯丙氨酸氨裂解酶，多酚氧化酶，抗坏血酸过氧化物酶和超氧化物歧化酶活性的曲线下，喷施亚磷酸锌的植物显示出较高的面积值。亚磷酸锌喷剂使植物致敏，以增强植物的防御反应和抗氧化能力，从而降低Xapf触发了氧化应激，从而更有效地保护了光合装置。