scholarly journals Edaphoclimatic Descriptors of Wild Tomato Species (Solanum Sect. Lycopersicon) and Closely Related Species (Solanum Sect. Juglandifolia and Sect. Lycopersicoides) in South America

2021 ◽  
Vol 12 ◽  
Author(s):  
Gabriela Ramírez-Ojeda ◽  
Iris Edith Peralta ◽  
Eduardo Rodríguez-Guzmán ◽  
Jaime Sahagún-Castellanos ◽  
José Luis Chávez-Servia ◽  
...  
Keyword(s):  
Genetic Resources ◽  
Related Species ◽  
Phylogenetic Groups ◽  
Closely Related Species ◽  
Actual Distribution ◽  
Wild Tomato ◽  
Wild Tomato Species ◽  
Tomato Species ◽  
Solanum Sect ◽  
Edaphic Variables

Wild species related to cultivated tomato are essential genetic resources in breeding programs focused on food security to face future challenges. The ecogeographic analysis allows identifying the species adaptive ranges and most relevant environmental variables explaining their patterns of actual distribution. The objective of this research was to identify the diversity, ecological descriptors, and statistical relationship of 35 edaphoclimatic variables (20 climatic, 1 geographic and 14 edaphic variables) from 4,649 accessions of 12 wild tomato species and 4 closely related species classified in Solanum sect. Lycopersicon and clustered into four phylogenetic groups, namely “Lycopersicon group” (S. pimpinellifolium, S. cheesmaniae, and S. galapagense), “Arcanum group” (S. arcanum, S. chmielewskii, and S. neorickii), “Eriopersicon group” (S. habrochaites, S. huaylasense, S. corneliomulleri, S. peruvianum, and S. chilense), “Neolycopersicon group” (S. pennellii); and two phylogenetically related groups in Solanum sect. Juglandifolia (S. juglandifolium and S. ochranthum), and section Lycopersicoides (S. lycopersicoides and S. sitiens). The relationship between the climate and edaphic variables were determined by the canonical correlation analysis, reaching 89.2% of variation with the first three canonical correlations. The most significant climatic variables were related to humidity (annual evapotranspiration, annual precipitation, and precipitation of driest month) and physicochemical soil characteristics (bulk density, pH, and base saturation percentage). In all groups, ecological descriptors and diversity patterns were consistent with previous reports. Regarding edaphoclimatic diversity, 12 climate types and 17 soil units were identified among all species. This approach has promissory applications for biodiversity conservation and uses valuable genetic resources related to a leading crop.

scholarly journals Climatic Diversity and Ecological Descriptors of Wild Tomato Species (Solanum sect. Lycopersicon) and Close Related Species (Solanum sect. Juglandifolia y sect. Lycopersicoides) in Latin America

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 855
Author(s):  
Gabriela Ramírez-Ojeda ◽  
Iris E. Peralta ◽  
Eduardo Rodríguez-Guzmán ◽  
José Luis Chávez-Servia ◽  
Jaime Sahagún-Castellanos ◽  
...  
Keyword(s):  
Latin America ◽  
Geographical Distribution ◽  
Related Species ◽  
Sustainable Use ◽  
Principal Component ◽  
Climatic Variables ◽  
Tomato Crop ◽  
Wild Tomato Species ◽  
Tomato Species ◽  
Solanum Sect

Conservation and sustainable use of species diversity require a description of the environment where they develop. The objectives were to determine ecological descriptors and climatic diversity of areas along the distribution range of 12 species of wild tomatoes (Solanum sect. Lycopersicon) and four wild species of phylogenetically related groups (Solanum sect. Juglandifolia and sect. Lycopersicoides), as well as their ecological similarity in Latin America. With 4228 selected tomato accessions and an environmental information system (EIS) composed of 21 climatic variables, diversity patterns of the distribution areas were identified for each species, as well as ecological descriptors through the use of geographic information systems (GIS). The contribution of climatic variables to the species geographical distribution was identified by principal component analysis (PCA), and similarity in species distribution as a function of the variables identified with cluster analysis (CA). Climatic characteristics and the environmental amplitude of wild tomatoes and related species along their distributional range were satisfactorily determined by ecological descriptors. Eleven climate types were identified, predominantly BSk (arid, steppe, cold), BWh (arid, desert, hot), and Cfb (temperate, no dry season, warm summer). PCA determined 10 most important variables were the most important for the geographical distribution. Six groups of species were identified according to CA and climatic distribution similarity. This approach has shown promissory applications for biodiversity conservation of valuable genetic resources for tomato crop breeding.

scholarly journals Bactericera cockerelli resistance in the wild tomato Solanum habrochaites is polygenic and influenced by the presence of Candidatus Liberibacter solanacearum

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Carlos A. Avila ◽  
Thiago G. Marconi ◽  
Zenaida Viloria ◽  
Julianna Kurpis ◽  
Sonia Y. Del Rio
Keyword(s):  
Recombinant Inbred Lines ◽  
Chromosome 8 ◽  
Bactericera Cockerelli ◽  
Wild Tomato ◽  
Wild Tomato Species ◽  
Tomato Species ◽  
Cultivar Development ◽  
In The Wild ◽  
Candidatus Liberibacter ◽  
Complex Inheritance

Abstract The tomato-potato psyllid (TPP), Bactericera cockerelli, is a vector for the phloem-limited bacterium Candidatus Liberibacter solanacearum (Lso), the causative agent of economically important diseases including tomato vein-greening and potato zebra chip. Here, we screened 11 wild tomato relatives for TPP resistance as potential resources for tomato (Solanum lycopersicum) cultivar development. Six accessions with strong TPP resistance (survival <10%) were identified within S. habrochaites, S. pennelli, S. huaylasense, S. chmielewskii, S. corneliomulleri, and S. galapagense. Two S. pennelli and S. corneliomulleri accessions also showed resistance to Lso. We evaluated recombinant inbred lines (RILs) carrying resistance from S. habrochaites accession LA1777 in the S. lycopersicum background and identified major quantitative trait loci (QTLs) responsible for adult TPP mortality and fecundity in several RILs carrying insertions in different chromosomes, indicating the polygenic nature of these traits. Analysis of a major resistance QTL in RIL LA3952 on chromosome 8 revealed that the presence of Lso is required to increase adult TPP mortality. By contrast, the reduced TPP oviposition trait in LA3952 is independent of Lso. Therefore, resistance traits are available in wild-tomato species, although their complex inheritance and modes of action require further characterisation to optimise their utilisation for tomato improvement.

scholarly journals Germplasm Evaluation of Tomato for Resistance to the Emerging Wilt Pathogen Fusarium Equiseti

2018 ◽  
Vol 5 (4) ◽  
pp. 174
Author(s):  
Asma Akbar ◽  
Shaukat Hussain ◽  
Gul Shad Ali
Keyword(s):  
Genetic Difference ◽  
Fusarium Species ◽  
The Other ◽  
Resistant Variety ◽  
Fusarium Equiseti ◽  
Tomato Variety ◽  
Wild Tomato ◽  
Wild Tomato Species ◽  
Tomato Species ◽  
Genetic Pool

Fusarium wilt caused by different Fusarium species is a devastating disease causes heavy loss to tomato plantation worldwide. In this study 13 tomato varieties were screened against F. equiseti to explore the resistance potential of the varieties against the disease. Out of 13 varieties only 2 varieties Roma and Hybrid showed resistance to the disease, while the other 69% were highly susceptible. Based on cluster analysis for genetic diversity it was reported that susceptible varieties are only 8% genetically different and share same genetic pool. We reported that the wild species of tomato Solanum pimpinellifolium (Sp- 2093) showed complete immunity and were remain unaffected having 25% genetic difference with other varieties tested. Thus wild tomato species may provide the source of resistance required to develop resistant variety against the emerging wilt pathogen F. equiseti. The data regarding virluence structure and resisatnt variety that is presented in this study will suport more focused efforts in the management of tomato wilt caused by Fusarium species and that resistant features of wild tomato variety Sp-2093, could be accumulated with other desirable characteristics of different germplasm in one cultivar, which will reduce the chances for new virulent species to evolve.

Chilling-induced water stress: Variation in shoot turgor maintenance among wild tomato species from diverse habitats

2013 ◽  
Vol 100 (10) ◽  
pp. 1991-1999 ◽  
Author(s):  
Hsien Ming Easlon ◽  
José Salvador Rubio Asensio ◽  
Dina A. St.Clair ◽  
Arnold J. Bloom
Keyword(s):  
Water Stress ◽  
Stress Variation ◽  
Wild Tomato ◽  
Wild Tomato Species ◽  
Tomato Species ◽  
Turgor Maintenance

scholarly journals Interspecific reproductive barriers between sympatric populations of wild tomato species (SolanumsectionLycopersicon)

2016 ◽  
Vol 103 (11) ◽  
pp. 1964-1978 ◽  
Author(s):  
You Soon Baek ◽  
Suzanne M. Royer ◽  
Amanda K. Broz ◽  
Paul A. Covey ◽  
Gloria López-Casado ◽  
...  
Keyword(s):  
Reproductive Barriers ◽  
Sympatric Populations ◽  
Wild Tomato ◽  
Wild Tomato Species ◽  
Tomato Species
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