Citrus greening, also called Huanglongbing (HLB), is one of the most destructive citrus diseases worldwide. It is caused by the fastidious gram-negative α-proteobacteria bacterium Candidatus Liberibacter asiaticus (CLas) and vectored by the Asian citrus psyllid (ACP), Diaphorina citri. Currently, there is no cure for HLB, no compounds have been successful in controlling HLB, and no sustainable management practices have been established for the disease. Thus, searching for alternative citrus greening disease mitigation strategies is considered an urgent priority for a sustainable citrus industry. The aim of this study was to use compounds extracted from oak, Quercus hemisphaerica, and to assess the antibacterial effects of these against CLas-infected citrus plants. The application of aqueous oak leaf extracts showed substantial inhibitory effects against CLas in citrus plants and the activity of genes related to starch. Significant differences were also observed in plant phenotypic and physiological traits after treatments. Citrus plants treated with oak extracts displayed an increase in stomatal conductance, chlorophyll content and nutrient uptake concurrently with a reduction of CLas titer, when compared to citrus plants treated with just water. The information provided from this study suggests a new management treatment program to effectively deal with the HLB disease.

中文翻译：

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栎叶提取物显示出对亚洲假丝酵母的治疗效果，可恢复受HLB影响的柑橘树中的叶片生理参数。

柑橘绿化又称黄龙病（HLB），是全球最具破坏性的柑橘病之一。它是由挑剔的革兰氏阴性α-变形杆菌细菌亚洲念珠菌（Clasidatus Liberibacter asiaticus（CLas））引起的，并由亚洲柑橘木虱（ACP）Diaphorina citri携带。目前，尚无HLB的治愈方法，没有化合物能成功控制HLB，也没有建立针对该疾病的可持续管理方法。因此，寻找替代的柑橘绿化病缓解策略被认为是可持续柑橘产业的当务之急。这项研究的目的是使用从橡树栎（Quercus hemisphaerica）中提取的化合物，并评估这些化合物对受CLas感染的柑橘类植物的抗菌作用。橡木叶水提取物的应用显示出对柑橘类植物中的CLAs的抑制作用以及与淀粉有关的基因的活性。处理后植物的表型和生理性状也观察到显着差异。与仅用水处理的柑橘类植物相比，用橡木提取物处理的柑橘类植物显示气孔导度，叶绿素含量和养分吸收增加，同时CLas滴度降低。这项研究提供的信息表明，可以有效治疗HLB疾病的新的治疗方案。与仅用水处理的柑橘类植物相比，用橡木提取物处理的柑橘类植物显示气孔导度，叶绿素含量和养分吸收增加，同时CLas滴度降低。这项研究提供的信息表明，可以有效治疗HLB疾病的新的治疗方案。与仅用水处理的柑橘类植物相比，用橡木提取物处理的柑橘类植物显示气孔导度，叶绿素含量和养分吸收增加，同时CLas滴度降低。这项研究提供的信息表明，可以有效治疗HLB疾病的新的治疗方案。