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Huanglongbing:An overview of a complex pathosystem ravaging the world's citrus

Journal of Integrative Plant Biology 2016年第4期58卷 373-387页

作者： John V.da Graca Greg W.Douhan Susan E.Halbert Manjunath L.Keremane Richard F.Lee georgios vidalakis Hongwei Zhao Texas A&M University--Kingsville Citrus Center WeslacoTexas 78599USA Department of Plant Pathology and Microbiology University of CaliforniaRiversideCalifornia 92521USA Florida Department of Agriculture and Consumer Services Division of Plant IndustryP.O.Box 147100GainesvilleFlorida 32614USA USDA ARS National Clonal Germplasm Repository for Citrus and Dates RiversideCalifornia 92507USA College of Plant Protection Nanjing Agricultural UniversityNanjing 210095China

Citrus huanglongbing（HLB） has become a major disease and limiting factor of production in citrus areas that have become infected. The destruction to the affected citrus industries has resulted in a tremendous increase to support research that in return has resulted in significant information on both applied and basic knowledge concerning this important disease to the global citrus industry. Recent research indicates the relationship between citrus and the causal agent of HLB is shaped by multiple elements, in which host defense responses may also play an important role. This review is intended to provide an overview of the importance of HLB to a wider audience of plant biologists. Recent advances on host-pathogen interactions, population genetics and vectoring of the causal agent are discussed.

关键词： Citrus greening Diaphorina citri host response Huanglongbing(HLB) psyllid vectors

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Small RNA Profiling Reveals Phosphorus Deficiency as a Contributing Factor in Symptom Expression for Citrus Huanglongbing Disease

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Molecular Plant 2013年第2期6卷 301-310页

作者： Hongwei Zhao Ruobai Sun Ute Albrecht Chellappan Padmanabhan Airong Wanga Michael D. Coffey Thomas Girke Zonghua Wang Timothy J. Close Mikeal Roose Raymond K. Yokomi Svetlana Folimonova georgios vidalakis Robert Rouse Kim D. Bowman Hailing Jin Department of Plant Pathology and Microbiology University of California Riverside CA 92521 USA Institute for Integrative Genome Biology University of California Riverside CA 92521 USA Present address: Department of Plant Pathology College of Plant Protection Nanjing Agricultural University Nanjing 210095 China Department of Botany and Plant Sciences University of California Riverside CA 92521 USA US Horticultural Research Laboratory US Department of Agriculture Agricultural Research Service 2001 South Rock Road Fort Pierce FL 34945 USA Fujian Agriculture and Forestry University Fuzhou 350002-China San Joaquin Valley Agricultural Research Center US Department of Agriculture Agricultural Research Service 9611 S. Riverbend Ave Parlier CA 93648 USA Citrus Research and Education Center University of Florida 700 Experiment Station Road Lake Alfred FL 33850 USA University of Florida 2685 State Road29 North immokaleel FL 34142 USA

Huanglongbing （HLB） is a devastating citrus disease that is associated with bacteria of the genus ＇Candidatus Liberibacter＇（Ca. L.）. Powerful diagnostic tools and management strategies are desired to control HLB. Host small RNAs （sRNA） play a vital role in regulating host responses to pathogen infection and are used as early diagnostic markers for many human diseases, including cancers. To determine whether citrus sRNAs regulate host responses to HLB, sRNAs were profiled from Citrus sinensis 10 and 14 weeks post grafting with Ca. L. asiaticus （Las）-positive or healthy tissue. Ten new microRNAs （miRNAs）, 76 conserved miRNAs, and many small interfering RNAs （siRNAs） were discovered. Several miRNAs and siRNAs were highly induced by Las infection, and can be potentially developed into early diagnosis markers of HLB. miR399, which is induced by phosphorus starvation in other plant species, was induced specifically by infection of Las but not Spiroplasma citri that causes citrus stubborn--a disease with symptoms similar to HLB. We found a 35% reduction of phosphorus in Las-positive citrus trees compared to healthy trees. Applying phosphorus oxyanion solutions to HLB-positive sweet orange trees reduced HLB symptom severity and significantly improved fruit production during a 3-year field trial in south-west Florida. Our molecular, physiological, and field data suggest that phosphorus deficiency is linked to HLB disease symptomology.

关键词： Huanglongbing small RNA miRNA399 disease diagnosis phosphorus deficiency.

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