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Marker Assisted Selection in Citrus Rootstock Breeding Based on a Major Gene Locus ‘Tyr1’Controlling Citrus Nematode Resistance

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Agricultural Sciences in China 2010年第4期9卷 557-567页

作者： XIANG Xu DENG Zhan-ao CHEN Chun-xian Fred G Gmitter Jr Kim Bowman Institute of Fruit Tree research Guangdong Academy of Agricultural Sciences Guangzhou 510640 P.R.China gulf coast research and education center University of Florida Bradenton FL34203 USA Citrus research and education center University of Florida Lake Alfred FL33850 USA US Horticultural research Laboratory United States Department of Agriculture Ft. Pierce FL34945-3030 USA

Based on the former constructed ＇Tyrl＇ locus genetic map in family 9145, from LB6-2 [Clementine mandarin （C. reticulata） × Hamlin orange （C. sinensis）] × Swingle citrumelo （C. paradise × P. trifoliata）, 9 markers were chosen for application in evaluating their effectiveness in marker-assisted selection （MAS） for citrus rootstock breeding program from many F1 progeny of Poncirus trifoliata. As the mapping revealed that these markers were estimated within a range of 12.1 cM in the linkage group, and among them, SCO07 co-segregated with ＂Tyrl＇, and 7A4R as the closest to ＇Tyrl＇ with a distance of 1.5 cM, these markers were basically fitful to go MAS screening. The results of screening P. trifoliata F1 progeny indicated that all the markers were inherited in codominant fashion and most of them were heterozygous on PT （Pomery of P. trifoliata）., marker 4L17R/CfoI and 7A4（1407）/BfaI were proved to be consistently reliable for accurate scoring of genotypes and the revealed polymorphism was basically coincided with the citrus nematode resistant phenotype within tested populations. The polymorphic genotype with marker 4L17R/Cfol was found completely matched up with the phenotype of individuals that conferred high resistance to citrus nematode when the USDA hybrid rootstocks were screened. Utilization of these markers, especially the highly specific 4L17R/Cfol and 7A4（1407）/Bfal, should result in great benefit to world citrus industry for early selection in rootstock-breeding program.

关键词： citrus Poncirus trifoliata nematode resistance marker-assisted selection

Chemical Characterization of Tomato Industry Wastewater, florida, United States

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Journal of Water Resource and Protection 2012年第3期4卷 107-114页

作者： Maninder K. Chahal Gurpal S. Toor Bielinski M. Santos Soil and Water Quality Laboratory Gulf Coast Research and Education Center University of Florida Wimauma Florida USA

Tomato packers often struggle to find ways to reuse the large volumes of wastewater generated during the tomato cleaning and sanitizing processes due to high transportation costs for off-site disposal and strict surface water discharge regulations in florida. Information about the composition of tomato packinghouse wastewater and the likely sources of major wastewater constituents might provide insights to develop environmentally sustainable practices for wastewater reuse. The objective of this study was to characterize the chemical composition of wastewater generated in tomato packinghouses. The wastewater samples were collected for 6 to 8 hours from dump tanks of two representative packinghouses at 30 minute intervals after start-up of packing operations during May-June 2009. Results showed that wastewater had high electrical conductivity (1.3 - 2.8 dS·m–1) and chloride (255 - 1125 mg·L–1) due to the use of chlorine as a sanitizer in the packinghouses. Concentrations of total phosphorus (P, 2.8 - 5.7 mg·L–1) and copper (Cu, 1.9 - 2.2 mg·L–1) in wastewater were elevated due to tomato cleaning and sanitizing. To reduce P and Cu concentrations, treatment or blending of wastewater may be needed before discharging wastewater to surface waters. Concentrations of P, potassium, calcium, magnesium, zinc, iron, and manganese were much higher in packinghouse 1 as compared to packinghouse 2 wastewater, probably due to the greater contact time of tomatoes with the dump tank water. Whereas concentrations of Cu were similar in both packinghouses wastewater. Greater concentrations of chemical constituents in the wastewater suggest that residues of pesticides, insecticides, and/or foliar-applied micronutrients on tomatoes may be the likely external sources of most constituents (especially P, Cu, and Zn) in wastewater.

关键词： Tomatoes Wastewater Packinghouse Nutrients Trace Metals

Mapping of QTLs and candidate genes associated with multiple phenotypic traits for Huanglongbing tolerance in citrus

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Horticultural Plant Journal 2023年第4期9卷 705-719页

作者： Ming Huang Mikeal L. Roose Qibin Yu Ed Stover David G. Hall Zhanao Deng Frederick G.Gmitter Jr. Key Laboratory of Plant Hormones and Development Regulation of Chongqing College of Life SciencesChongqing UniversityChongqing 401331China Citrus research and education center University of FloridaLake AlfredFL 33850United States Department of Botany and Plant Sciences University of CaliforniaRiversideCA 92521United States United States Horticultural research Laboratory Agricultural Research ServiceUnited States Department of AgricultureFort PierceFL 34945United States gulf coast research and education center University of FloridaWimaumaFL 33598United States

Huanglongbing(HLB)is the most devastating disease for citrus *** Liberibacter asiaticus(C Las),vectored by Asian citrus psyllid(ACP,Diaphorina citri Kuwayama),is the most common pathogen causing the *** citrus varieties are highly susceptible to HLB,whereas trifoliate orange(Poncirus trifoliata)is considered highly tolerant to *** F1 segregating population and their parent trifoliate orange and sweet orange,which had been exposed to intense HLB pressure for three years,was evaluated for disease symptoms,ACP colonization,C Las titer and tree vigor repeatedly for two to three *** orange and sweet orange showed significant differences for most of the phenotypic traits,and the F1 population exhibited a large variation.A high-density SNP-based genetic map with 1402 markers was constructed for trifoliate orange,which exhibited high synteny and high coverage of its reference genome.A total of 26 quantitative trait locus(QTLs)were identified in four linkage groups LG-t6,LG-t7,LG-t8 and LG-t9,of which four QTL clusters exhibit a clear co-localization of QTLs associated with different *** genome-wide analysis of gene expression in response to C Las infection in‘Flying Dragon’and‘Larger-Flower DPI-50-7’trifoliate orange,85 differentially expressed genes were found located within the QTL *** them,seven genes were classified as defense or immunity protein which exhibited the highest transcriptional change after C Las *** results indicate a quantitative genetic nature of HLB tolerance and identified candidate genes that should be valuable for searching for genetic solutions to HLB through breeding or genetic engineering.

关键词： Candidatus liberibacter QTL mapping Phenotyping F1 population Poncirus Citrus

Integration of early disease-resistance phenotyping, histological characterization, and transcriptome sequencing reveals insights into downy mildew resistance in impatiens

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Horticulture research 2021年第1期8卷 1473-1494页

作者： Ze Peng Yanhong He Saroj Parajuli Qian You Weining Wang Krishna Bhattarai Aaron JPalmateer Zhanao Deng university of florida IFASDepartment of Environmental HorticultureGulf Coast Research and Education Center14625 County Road 672WimaumaFL 33598USA State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural University510642 GuangzhouChina Visiting scholar at university of florida IFASDepartment of Environmental HorticultureGulf Coast Research and Education Center14625 County Road 672WimaumaFL 33598USA Key Laboratory of Horticultural Plant Biology Ministry of EducationCollege of Horticulture and Forestry SciencesHuazhong Agricultural University430070 WuhanHubeiChina university of florida IFASDepartment of Plant PathologyTropical Research and Education Center18905 S.W.280th StreetHomesteadFL 33031USA Present address:Bayer Environmental Science US 5000 Centregreen WayCaryNC 27513USA

Downy mildew(DM),caused by obligate parasitic oomycetes,is a destructive disease for a wide range of crops *** outbreaks of impatiens downy mildew(IDM)in many countries have caused huge economic losses.A system to reveal plant–pathogen interactions in the early stage of infection and quickly assess resistance/susceptibility of plants to DM is *** this study,we established an early and rapid system to achieve these goals using impatiens as a ***-two cultivars of Impatiens walleriana and *** were evaluated for their responses to IDM at cotyledon,first/second pair of true leaf,and mature plant *** *** cultivars were highly susceptible to *** all *** cultivars were resistant to IDM starting at the first true leaf stage,many(14/16)were susceptible to IDM at the cotyledon *** cultivars showed resistance even at the cotyledon *** characterization showed that the resistance mechanism of the *** cultivars resembles that in grapevine and type II resistance in *** integrating full-length transcriptome sequencing(Iso-Seq)and RNA-Seq,we constructed the first reference transcriptome for Impatiens comprised of 48,758 sequences with an N50 length of 2060 *** transcriptome and qRT-PCR analyses revealed strong candidate genes for IDM resistance,including three resistance genes orthologous to the sunflower gene RGC203,a potential candidate associated with DM *** approach of integrating early disease-resistance phenotyping,histological characterization,and transcriptome analysis lay a solid foundation to improve DM resistance in impatiens and may provide a model for other crops.

关键词： cultivar mildew crops

Fate of Nutrients, Trace Metals, Bacteria, and Pesticides in Nursery Recycled Water

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Journal of Water Resource and Protection 2015年第4期7卷 293-299页

作者： Yun-Ya Yang Gurpal S. Toor Soil and Water Quality Laboratory Gulf Coast Research and Education Center Institute of Food and Agricultural Sciences University of Florida Wimauma FL USA

Faced with rapid population growth and fresh water scarcity, reuse of reclaimed water is growing worldwide and becoming an integral part of water resource management. Our objective was to determine the fate of nutrients, trace metals, bacteria, and legacy organic compounds (organochlorine pesticides) in the recycled water from five commercial nursery ponds in florida. The pH of recycled water at all sites was 8.1 - 9.3, except one site (6.5), while the electrical conductivity (EC) was 0.31 - 0.36 dS/m. Concentrations of trace metals in recycled water were low: Fe (0.125 - 0.367 mg/L), Al (0.126 - 0.169 mg/L), B (0.104 - 0.153 mg/L), Zn (0.123 - 0.211 mg/L), and Mn (florida’s nursery recycled water ponds.

关键词： Water Quality Recycled Water Nutrients Trace Metals Pathogen Pesticides

Construction of citrus gene coexpression networks from microarray data using random matrix theory

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Horticulture research 2015年第1期2卷 193-200页

作者： Dongliang Du Nidhi Rawat Zhanao Deng Fred G.Gmitter Jr. Citrus research and education center Institute of Food and Agricultural SciencesUniversity of FloridaLake AlfredFL 33850USA gulf coast research and education center Institute of Food and Agricultural SciencesUniversity of FloridaWimaumaFL 33598USA

After the sequencing of citrus genomes,gene function annotation is becoming a new *** coexpression analysis can be employed for function annotation using publicly available microarray data *** this study,230 sweet orange(Citrus sinensis)microarrays were used to construct seven coexpression networks,including one condition-independent and six condition-dependent(Citrus canker,Huanglongbing,leaves,flavedo,albedo,and flesh)*** total,these networks contain 37633 edges among 6256 nodes(genes),which accounts for 52.11%measurable genes of the citrus ***,these networks were partitioned into functional modules using the Markov Cluster *** enriched Gene Ontology biological process terms and KEGG pathway terms were detected for 343 and 60 modules,***,independent verification of these networks was performed using another expression data of 371 *** study provides new targets for further functional analyses in citrus.

关键词： measurable orange partitioned

Deep Learning for Strawberry Canopy Delineation and Biomass Prediction from High-Resolution Images

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Plant Phenomics 2022年第1期4卷 58-74页

作者： Caiwang Zheng Amr Abd-Elrahman Vance M.Whitaker Cheryl Dalid gulf coast research and education center University of FloridaWimaumaFL 33598USA School of Forest Fisheriesand Geomatics SciencesUniversity of FloridaGainesvilleFL 32603USA Horticultural Sciences Department University of FloridaGainesvilleFL 32603USA

Modeling plant canopy biophysical parameters at the individual plant level remains a major *** study presents a workflow for automatic strawberry canopy delineation and biomass prediction from high-resolution images using deep neural ***-resolution(5 mm)RGB orthoimages,near-infrared(NIR)orthoimages,and Digital Surface Models(DSM),which were generated by Structure from Motion(SfM),were utilized in this *** R-CNN was applied to the orthoimages of two band combinations(RGB and RGB-NIR)to identify and delineate strawberry plant canopies.

关键词： Deep neural individual

A single gene controls leaf background color in caladium (Araceae) and is tightly linked to genes for leaf main vein color, spotting and rugosity

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Horticulture research 2017年第1期4卷 389-397页

作者： Zhe Cao Shunzhao Sui Qian Yang Zhanao Deng Department of Environmental Horticulture Gulf Coast Research and Education CenterIFASUniversity of Florida14625 County Road 672Wimauma33598FLUSA College of Horticulture and Landscape Southwest UniversityChongqing400715China Department of Environmental Horticulture Visiting ScientistGulf Coast Research and Education CenterIFASUniversity of Florida14625 County Road 672Wimauma33598FLUSA

Modern cultivated caladiums(Caladium×hortulanum)are grown for their long-lasting and colorful *** the mode of inheritance for caladium leaf characteristics is critical for plant breeders to select appropriate parents,predict progeny performance,estimate breeding population sizes needed,and increase breeding *** study was conducted to determine the mode of inheritance of two leaf background colors(lemon and green)in caladium and to understand their relationships with four other important leaf characteristics including leaf shape,main vein color,spotting,and *** caladium cultivars and three breeding lines were used as parents in 19 crosses,and their progeny were phenotyped for segregation of leaf *** showed that the two leaf background colors are controlled by a single nuclear locus,with two alleles,LEM and lem,which control the dominant lemon and the recessive green leaf background color,*** lemon-colored cultivar‘Miss Muffet’and breeding lines UF-52 and UF-53 have a heterozygous genotype ***-square tests showed that the leaf background color locus LEM is independent from the leaf shape locus F,but is tightly linked to three loci(S,V and RLF)controlling leaf spotting,main vein color,and rugosity in caladium.A linkage map that consists of four loci controlling major caladium leaf characteristics and extends~15 cM was developed based on the observed recombination *** is the first report on the mode of inheritance of leaf background colors in caladium and in the Araceae *** information gained in this study will be very useful for caladium breeding and study of the inheritance of leaf colors in other ornamental aroids,an important group of ornamental plants in the world.

关键词： breeding cultivar lemon

Evolution of the MLO gene families in octoploid strawberry(Fragaria×ananassa)and progenitor diploid species identified potential genes for strawberry powdery mildew resistance

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Horticulture research 2021年第1期8卷 1969-1985页

作者： Ronald R.Tapia Christopher R.Barbey Saket Chandra Kevin M.Folta Vance M.Whitaker Seonghee Lee Department of Horticultural Sciences University of FloridaIFAS Gulf Coast Research and Education CenterWimaumaFL 33598USA Department of Horticultural Sciences University of Florida1301 Fifield HallPO Box 110690GainesvilleFL 32611USA

Powdery mildew(PM)caused by Podosphaera aphanis is a major fungal disease of cultivated *** Resistance Locus O(MLO)is a gene family described for having conserved seven-transmembrane *** loss-of-function in specific MLO genes can confer durable and broad resistance against PM ***,the genomic structure and potential role of MLO genes for PM resistance have not been characterized yet in the octoploid cultivated *** the present study,MLO gene families were characterized in four diploid progenitor species(Fragaria vesca,***,***,and ***)and octoploid cultivated(Fragaria×ananassa)strawberry,and potential sources of MLO-mediated susceptibility were *** MLO sequences were identified in *** and 68 identified in F.×*** analysis divided diploid and octoploid strawberry MLO genes into eight different clades,in which three FveMLO(MLO10,MLO17,and MLO20)and their twelve orthologs of FaMLO were grouped together with functionally characterized MLO genes conferring PM *** number variations revealed differences in MLO composition among homoeologous chromosomes,supporting the distinct origin of each subgenome during the evolution of octoploid *** genomic sequence and structural variations in candidate FaMLO genes revealed their potential role associated with genetic controls and functionality in strawberry against PM ***,the gene expression profiling and RNAi silencing of putative FaMLO genes in response to the pathogen indicate the function in PM *** results are a critical first step in understanding the function of strawberry MLO genes and will facilitate further genetic studies of PM resistance in cultivated strawberry.

关键词： straw MLO Fragaria