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Cold acclimation increases Asian citrus psyllid Diaphorina citri (Hemiptera: Liviidae) survival during exposure to freezing temperatures

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Insect Science 2022年第2期29卷 531-538页

作者： Xavier Martini Kathi Malfa Dara Stockton Monique JRivera Department of Entomology and Nematology North Florida Research and Education CenterQuincyFloridaUSA USDA-ARS U.S.Pacific Basin Agricultural Research CenterHiloHawaiiUSA Department of Entomology University of CaliforniaRiversideCaliforniaUSA

The Asian citrus psyllid,Diaphorina citri,is the vector of the pathogenic bacteria that causes Huanglongbing,the most devasting disease affecting citrus *** cultivation of citrus tends to expand northward,the tolerance of psyllids to freezing temperatures needs to be *** mortality of *** to cold temperature has been previously studied,much less is known regarding the acclimation potential of psyllids to cold *** first evaluated cold resistance of *** depending on color morph and ***,we compared mortality of *** at−4°C for 10 hours between unacclimated psyllids,psyllids that were gradually acclimated to cold over 1 or 2 weeks,and psyllids intermittently acclimated also for 1 or 2 *** did not find major differences in cold resistance between color morphs and *** found that after 1 week of gradual acclimation,the survival of psyllids at−4°C increased to 86%,compared to 20%in the control *** did not increase after the second week of gradual *** intermittent acclimation improved survival compared to the control group,it was less effective than gradual acclimation with a survival at 30%and 70%after 1 and 2 weeks of acclimation,respectively,although this difference with gradual acclimation was not significant at week *** data show that gradual cold acclimation allows *** to survive brief periods below *** may serve as a mechanism responsible for increasing northern establishment of this pest.

关键词： cold acclimation cold hardy citrus cold resistance citrus greening Diaphorina citri overwintering

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Bioinformatic Analysis of Potential Pathogenicity Effectors of <i>Candidatus</i>Liberibacter asiaticus, Causal Agent of citrus Huanglongbing

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American Journal of Plant Sciences 2020年第8期11卷 1319-1330页

作者： Felipe Roberto Flores-de la Rosa Cynthia Guadalupe Rodríguez-Quibrera Cristian Matilde-Hernández Ricardo Santillán-Mendoza Campo Experimental Ixtacuaco Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias (INIFAP) Km 4.5 Carretera Federal Martínez de la Torre-Tlapacoyan Tlapacoyan Veracruz México

Huanglongbing (HLB) or citrus greening is currently the most important citrus disease, caused by the bacterium Candidatus Liberibacter asiaticus (CLas). The impossibility of isolating it causes understanding its pathogenic mechanisms to be a complicated task. Recent studies identified 16 proteins with the signal peptide needed to be secreted in the plant and cause the disease. The present study aims to perform a bioinformatic analysis of these proteins with the function prediction approach by gene ontology (GO) and the detection of conserved domains. It was observed that of the 16 proteins analyzed not all are found in different infective strains reported in the literature. The GO analysis allowed us to relate different proteins with the biological process of energy and pathogenic activity, especially CLIBASIA_03315 and CLIBASIA_05115, respectively. The domain analysis allowed the observation of a β-CA domain, tentatively related to the damage caused to the chloroplast and a PAAR domain associated with the T6SS secretory system. Our results provide information on the possible function of potential pathogenicity effectors in CLas.

关键词： Effectors Proteins Function Prediction Gen Ontology Domains citrus greening

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Status of Phytophthora and Huanglongbing Diseases of citrus Causing Decline in Coorg Mandarin in India

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Journal of Agricultural Science and Technology(B) 2017年第4期7卷 248-263页

作者： Priti Sonavane Venkataravanappa Venkataravanappa Division of Plant Pathology Central Horticultural Experiment Station Indian Council of Agriculture Research Indian Institute ofHortieultural Research Hessaraghatta Lake PO Chettalli Bangalore 571248 India

Coorg mandarin is a famous ecotype of mandarin grown in multi-tier cropping system in coffee and pepper plantations in Coorg region of India. The roving survey indicated disease incidence of Huanglongbing （HLB） and Phytophthora, ranging between 35%-64.2% and 22.5%-35.6% in different places of Coorg region. A total of 177 Phytophthora infected （plant roots 59, soil 118）, and 576 greening or HLB infected Coorg mandarin samples were collected from 184 Coorg mandarin orchards, of these I II Phytophthora isolates were isolated and characterized in this study on the basis of colony growth patterns and morphological structures. Based on the virulence, only 52 of 111 Phytophthora isolates were amplified by PCR using universal internal transcriber spacer （ITS） primers, cloned and sequenced. The sequences analysis of Phytophthora isolates revealed more than 97% nucleotide （nt） similarity within themselves, except eight isolates ofP. palmivora and four isolates ofP. nicotianae had varied nt identity （70.6% to 97.4%） with other Phytophthora species compared. Similarly, 523 of 576 Coorg mandarin samples were confirmed the presence of HLB infection by PCR using 16S rRNA gene specific universal primers. The representative five of 523 Coorg mandarin isolates showed nt identity ranged from 94.4% to 95.3% with Candidatus Liberibacter asiaticus （AB008366） isolate infecting citrus in Asia and one isolate of HLB shared nt identity of 96.9% with Ca. L. asiaticus （KJ944269）.

关键词： Phytophthora citrus greening gummosis RPARH medium Asian psyllid.

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First report of Soil Conditioner Mediated citrus Huanglongbing Improvement in the Field

First report of Soil Conditioner Mediated Citrus Huanglongbi...

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中国植物病理学会2012年学术年会

作者： XU Mei-Rong LIANG Mei-Dang GUAN Lei ZHENG Zheng ZHU Qing DENG Xiao-Ling1 (citrus Huanglongbing research group,College of natural resource and environment,South China Agricultural University,Guangzhou,510642,China)

＜正＞Huanglongbing（HLB） is a devastating and fastidious phloem-limited bacterial disease, with no known cure till now,causing substantial economic losses *** this study,we screened the efficacy of a new soil conditioner produced by Zaoqing South China Run-zhe-xin-ye Biotechnology Limited Liability Company on different aged citrus trees infected with Huanglongbing in 4 orchards situated in Sihui or Longmen of Guangdong *** shoots with newly generated leaves and more healthy symptoms were ***,newly generated leaves look green and healthy while the old leaves were light mottled and green on the treated *** the contrary,both young and old leaves from untreated trees showed typical HLB *** overall results of trial showed that infected citrus trees of 2,3,and 4-years old treated with the soil conditioner resulted in an significant decrease of bacterial concentration in ***,Candidatus Liberibacter asiaticus（Las） titers were reduced by more than 2 times in the treated leaves compared to those of untreated 2,3,and 8-years old diseased *** titers were significantly positively related with treatment（P = 0.048） and age（P = 0.022）, but not with leaf part（P ＞ 0.05 ）.Significantly,the mean titer in 2,3,and 8-years-old Shatangju trees were 17 433.9,36 572.4,and 76 459.2（in Copy number）,*** analysis of soil conditioner treatment efficacy in 4-years-old Chuntianju at 2,4,and 7 month-post treatment （mpt） showed that the quantities of Las were detected to be significantly lower in newly generated leaves at 7 mpt（94.51%decrease or 2.59 times lower than those at 4 or 2 mpt）.Bacterial titers in treated lines were significantly lower（34.12%decrease） than control lines,and 82.72%lower in young leaves than in mature ***-quantitative RT-PCR found most defense response genes detected were found increased by treatment;contrarily,most starch synthesis related genes including genes coding phloem-sp

关键词： citrus Huanglongbing citrus greening Fertilizer

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