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Soil boron fertilization:The role of nutrient sources and rootstocks in citrus production

Journal of Integrative Agriculture 2017年第7期16卷 1609-1616页

作者： Dirceu Mattos Jr Franz W R Hippler Rodrigo M Boaretto Eduardo S Stuchi Jose A Quaggio centro de citricultura sylvio moreira Instituto AgronSmicoCordeiropolis(SP)13490-970Brazil Estacao Experimental de citricultura de Bebedouro Bebedouro(SP)14700-970Brazil centro de Solos e Recursos Ambientais Instituto Agronomico/Bara de ItapuraCampinas(SP)13020-902Brazil

Boron （B） is a key element for citrus production, especially in tropical regions, where the nutrient availability is commonly low in the soil. In addition, information about doses, fertilizer sources, methods of application, and particularly, differential nutrient demand of scion/rootstock combinations are required for efficient fertilization of commercial groves. In a non-irri- gated sweet orange orchard （cv. Natal）, grafted onto Rangpur lime, Swingle citrumelo or Sunki mandarin, we studied the application of two sources of B： boric acid （17% B, soluble in water） and ulexite （12% B, partiaJly soluble in water） at four levels of supply （control without B, and soil application of 2, 4 and 6 kg ha-1 yr-1 of B）. The experiment was carried out for three years （2004-2006）. Boron availability in the soil and concentration in the leaves, as well as the fruit yield and quality of trees were evaluated. Soil B extracted with hot water and total leaf B positively correlated with doses of the nutrient applied to the trees. Levels of B in the soil and in the leaves did not vary with fertilizer sources. Fruit yield of trees grafted onto Rangpur lime and Swingle citrumelo was more responsive to B doses than those grafted onto Sunki mandarin. The maximum fruit yield of trees grafted onto Swingle was obtained with 3.2 kg ha-1 yr-1 of B, and leaf B level of 280 mg kg-1 that point out to a highest demand for B when this combination was compared with other rootstocks. Furthermore, fertilization with B did not affect the quality of fruits, but correlated with B and potassium （K） concentrations in the leaves. These results also support that the current recommendations for levels of B in leaves should be revisited.

关键词： boric acid ulexite fertilization via soil leaf analysis fruit quality citrus

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Fluoride Exposure Compromises Gas Exchange of Plants

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American Journal of Plant Sciences 2013年第12期4卷 16-20页

作者： Geisa Lima Mesquita Eduardo Caruso Machado Ricardo Machado Heitor Cantarella Dirceu Mattos Jr. centro de citricultura sylvio moreira (IAC) Cordeirópolis Brazil centro de Ecofisiologia e Biofísica (IAC) Campinas Brazil centro de Solos e Recursos Ambientais (IAC) Campinas Brazil centro de citricultura sylvio moreira (IAC) Cordeirópolis Brazil

Fluorine (F-) stands out for its phytotoxic potential, because it accumulates in plants, changes enzymes activity, reduces chlorophyll content and, consequently, affects growth and yield of crop plants. An experiment was conducted to evaluate the effects of F- on leaf gas exchange in coffee and sweet orange plants, compared to sensitive (gladiolus) and tolerant (ryegrass) reference species. Plants grown in pots were exposed to F- in a semi-open mist chamber. The experimental design was completely randomized with treatments defined by the combination of plant species and two intensities of exposure to atmospheric F, with nebulization of HF solutions (low = 0.065 mmol·m-3 and high = 0.260 mmol·m-3) in a mist chamber, as well as with non-exposed control samples. CO2 assimilation (A), transpiration (E), stomatal conductance (gs) and chlorophyll fluorescence rates were measured after 27 days of treatment application. The leaf gas exchange variables in ryegrass and orange plants did not vary in response to the increase in atmospheric F, while an increase in gs and E values was observed in gladiolus and coffee plants. A decrease in A and potential quantum efficiency of photosystem II (Fv/Fm) was found for gladiolus plants. On the contrary, an increase of A for coffee plants was associated with the apparent effect previously reported about the loss of leaf stomatal regulation related to the short assessment period of plants in this experiment. Damages caused to the photosynthetic system were reflected in the susceptibility of the evaluated species to the contamination by the element.

关键词： Fluoride Pollution Gas Exchange Citrus Coffee Bioindicator Species

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Selection of Bacillus thuringiensis strains in citrus and their pathogenicity to Diaphorina citri (Hemiptera: Liviidae) nymphs

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Insect Science 2020年第3期27卷 519-530页

作者： Silvia de Oliveira Dorta Juliana Balbinotte Rose Monnerat Joao Roberto Spotti Lopes Tatiane da Cunha Odimar Zanuzo Zanardi Marcelo Pedreira de Miranda Marcos Antonio Machado Juliana de Freitas-Astua Programs de Pos-Graduagao em Microbiologia Agricola Escola Superior de Agricultura Luiz de QueirozUniversidade de Sao PauloPiracicabaSPBrazil Laboratorio de Biotecnologia Centro de Citricultura Sylvio MoreiraInstituto Agronomico de CampinasCordeiropolisSPBrazil Laboratorio de Insetos Vetores de Fitopatdgenos Departamento de Entomologia e AcarologiaEscola Superior de Agricultura Luiz de QueirozUniversidade de Sao PauloPiracicabaSPBrazil Embrapa Recursos Geneticos e Biotecnologia BrasiliaDFBrazil Fundo de defesa da citricultura(Fundecitrus) AraraquaraSPBrazil Embrapa Mandioca e Fruticultura Cruz das AlmasBABrazil Laboratdrio de Bioquimica Fitopatoldgica Instituto BioldgicoSao PauloSPBrazil

Bacillus thuringiensis(Bt)toxins are effective in controlling insect pests either through the spraying of products or when expressed in transgenic *** discovery of endophytic Bt strains opened new perspectives for studies aimed at the control of sap‐sucking insects,such as the Asian citrus psyllid Diaphorina citri Kuwayama(Hemiptera:Liviidae),a vector of“Candidatus Liberibacter spp.,”associated with citrus huanglongbing(HLB).In this study,translocation of endophytic Bt strains in citrus seedlings inoculated with Bt suspension delivered by soil‐drench,and their systemic pathogenicity to *** nymphs were *** pathogenicity of three wild‐type Bt strains against *** third‐instar nymphs was *** the 10 recombinant strains tested(each of them harboring a single cry or cyt gene),3 can be highlighted,causing 42%–77%and 66%–90%nymphal mortality at 2 and 5 d after inoculation,*** isolation of Bt cells from young citrus shoots and dead nymphs,and PCR performed with specific primers,confirmed the involvement of the Bt strains in the psyllid *** is the first report showing the translocation of Bt strains from citrus seedling roots to shoots and their potential to control *** nymphs that fed on these soil‐drench inoculated *** Bt strains that caused the highest mortality rates have the potential to be used as bioinsecticides to control *** and the identified genes can be used for the production of transgenic Bt citrus.

关键词： Asian citrus psyllid Citrus sinensis Cry toxins endophytic Bt huanglongbing young shoots

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Comparative Study of Bioactive Components and Quality from Juices of Different Mandarins: Discriminant Multivariate Analysis of Their Primary and Secondary Metabolites

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Agricultural Sciences 2016年第6期7卷 341-351页

作者： Almudena Bermejo José L. Pardo Julia Morales Antonio Cano centro de citricultura y Producción Vegetal Instituto Valenciano de Investigaciones Agrarias Valencia Spain departamento de Biología Vegetal (Fisiología Vegetal) Facultad de Biología Universidad de Murcia Campus de Espinardo Murcia Spain

A comparative study of the primary and secondary metabolites of the juice of several mandarin cultivars with different pollination, seed production and parthenocarpic abilities was carried out, and the antioxidant capacity of the hydrophilic fraction was measured. Correlation by a Principal Component Analysis and a Cluster Analysis was used. By a multivariate analysis, the 15 citrus cultivars were clustered into four groups consistently with citrus types. The presented data are an important factor for choosing varieties with high potential as a nutraceutical source. These aspects are necessary as consumers demand prevention of health problems through nutrition and certain fruit quality traits, including fruit size, internal quality, good rind color and easy peeling.

关键词： Antioxidant Capacity Carotenoids Citrus Flavonoids Organic Acids Sugars Vitamin C

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Population structure of Araucaria angustifolia under distinct forest protection status:implications for management and conservation

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Journal of Forestry Research 2023年第5期34卷 1437-1446页

作者： Vinicius Costa Cysneiros Allan Libanio Pelissari sylvio Pellico Netto Sebastiao do Amaral Machado Afonso Figueiredo Filho departamento de Agricultura Biodiversidade e FlorestasUniversidade Federal de Santa Catarina-UFSCRodovia Ulysses GaboardiKm 03CuritibanosSC 89520-000Brazil departamento de Ciencias Florestais Universidade Federal do Paraná-UFPRAv.Prof.Lothario Meissner632CuritibaPR 80210-170Brazil departamento de Engenharia Florestal Universidade Estadual do Centro-Oeste-UNICENTROPR-153Km 7IratiPR 84500-000Brazil

Araucaria angustifolia is the dominant coniferous species in Brazil,a long-lived pioneer species and a supplier of valuable timber and non-timber products,which gives it key-species *** study examines how *** population structure affects the stand structure,and whether these relationships differ between protected and unprotected *** study was carried out on two protection status forests(national forest and urban forest)in a region of Atlantic mixed forest in ParanáState,southern *** coefficient and the Weibull shape parameter described the population structure and its effects on species diversity and biomass *** diameter distribution differed significantly between forests,with unbalanced structure in both,although regeneration was more abundant in the protected *** positively affected aboveground biomass whereas shape negatively affected it and species *** relationships differed between protected and unprotected *** effect of *** populations on stand structure was conditioned on protection ***-growth populations may have lower diversity and biomass stock even supporting large ***,old-growth forests,can lead to wood loss through mortality,senescence,and declining populations,representing the waste of a valuable timber *** findings provide useful knowledge for forest management,species conservation,and the carbon market.

关键词： Key species Diameter distribution Weibull shape parameter Aboveground biomass

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南方园艺 2014年第1期25卷 55-56页

作者： Hong Lin Helvecio D.Coletta-Filho Cliff S.Han 娄兵海 Edwin L.Civerolo Marcos A.Machado Goutam Gupta 白先进美国农业部农业研究服务署圣华金谷农业研究科学中心 Parlier市.加利福尼亚州.美国 Instituto Agronomico Centro de Citricultura Sylvio Moreira Cordeiro polis圣保罗州巴西 Los Alamos国家实验室 LosAlamos市新墨西哥州.美国广西柑桔研究所广西桂林541004

Hong Lin,Helvecio ***-Filho,Cliff ***,Binghai Lou,Edwin ***,Marcos ***,and Goutam *** genome sequence of"Candidatus Liberibacter americanus"bacterium associated with citrus huanglongbing in *** Announcements,2013,1(3):e00275-13.在此,我们报道"Candidatus Liberibacter americanus"PW_SP株系基因组草图序列。大小为1,176,071bp的基因组,G+C含量为31.6%,包含948个开放阅读框,38个tRNA,3个完整的rRNA。

关键词：基因组草图柑橘黄龙病序列细菌巴西开放阅读框 tRNA rRNA

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A key‘foxy’aroma gene is regulated by homologyinduced promoter indels in the iconic juice grape‘Concord’

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Horticulture Research 2020年第1期7卷 2028-2039页

作者： Yingzhen Yang JoséCuenca Nian Wang Zhenchang Liang Honghe Sun Benjamin Gutierrez Xiaojun Xi Jie Arro YiWang Peige Fan Jason Londo Peter Cousins Shaohua Li Zhangjun Fei Gan-Yuan Zhong US department of Agriculture-Agricultural Research Service Grape Genetics Research UnitGenevaNYUSA Beijing Key Laboratory of Grape Sciences and Enology Laboratory of Plant ResourcesInstitute of BotanyChinese Academy of SciencesBeijingChina Boyce Thompson Institute for Plant Research Cornell UniversityIthacaNYUSA US department of Agriculture-Agricultural Research Service Plant Genetic Resources UnitGenevaNYUSA Forestry and Pomology Research Institute Shanghai Academy of Agricultural SciencesShanghaiChina University of Chinese Academy of Sciences BeijingChina E.&J.Gallo Winery ModestoCAUSA US department of Agriculture–Agricultural Research Service Robert W.Holley Center for Agriculture and HealthIthacaNYUSA Present address:centro de citricultura y Producción Vegetal.Instituto Valenciano de Investigaciones Agrarias MoncadaValenciaSpain Present address:College of Horticulture and Forestry Huazhong Agricultural UniversityWuhanHubeiChina

‘Concord’,the most well-known juice grape with a parentage of the North American grape species Vitis labrusca L.,possesses a special‘foxy’aroma predominantly resulted from the accumulation of methyl anthranilate(MA)in *** aroma,however,is often perceived as an undesirable attribute by wine consumers and rarely noticeable in the common table and wine grape species *** we discovered homology-induced promoter indels as a major genetic mechanism for species-specific regulation of a key‘foxy’aroma gene,anthraniloyl-CoA:methanol acyltransferase(AMAT),that is responsible for MA *** found the absence of a 426-bp and/or a 42-bp sequence in AMAT promoters highly associated with high levels of AMAT expression and MA accumulation in‘Concord’and other ***-derived *** promoter variants,all with direct and inverted repeats,were further confirmed in more than 1,300 Vitis ***,functional impact of these indels was validated in transgenic *** on the promoter regulation,large structural changes including exonic insertion of a retrotransposon were present at the AMAT locus in some *** *** of the AMAT genetic regulation advances our understanding of the‘foxy’aroma trait and makes it genetically trackable and amenable in grapevine breeding.

关键词： insertion aroma grape

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