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De-la-Cruz IM, Oyama K, Núñez-Farfán J. The chromosome-scale genome and the genetic resistance machinery against insect herbivores of the Mexican toloache, Datura stramonium. G3 (Bethesda) 2024; 14:jkad288. [PMID: 38113048 PMCID: PMC10849327 DOI: 10.1093/g3journal/jkad288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 09/21/2023] [Accepted: 12/11/2023] [Indexed: 12/21/2023]
Abstract
Plant resistance refers to the heritable ability of plants to reduce damage caused by natural enemies, such as herbivores and pathogens, either through constitutive or induced traits like chemical compounds or trichomes. However, the genetic architecture-the number and genome location of genes that affect plant defense and the magnitude of their effects-of plant resistance to arthropod herbivores in natural populations remains poorly understood. In this study, we aimed to unveil the genetic architecture of plant resistance to insect herbivores in the annual herb Datura stramonium (Solanaceae) through quantitative trait loci mapping. We achieved this by assembling the species' genome and constructing a linkage map using an F2 progeny transplanted into natural habitats. Furthermore, we conducted differential gene expression analysis between undamaged and damaged plants caused by the primary folivore, Lema daturaphila larvae. Our genome assembly resulted in 6,109 scaffolds distributed across 12 haploid chromosomes. A single quantitative trait loci region on chromosome 3 was associated with plant resistance, spanning 0 to 5.17 cM. The explained variance by the quantitative trait loci was 8.44%. Our findings imply that the resistance mechanisms of D. stramonium are shaped by the complex interplay of multiple genes with minor effects. Protein-protein interaction networks involving genes within the quantitative trait loci region and overexpressed genes uncovered the key role of receptor-like cytoplasmic kinases in signaling and regulating tropane alkaloids and terpenoids, which serve as powerful chemical defenses against D. stramonium herbivores. The data generated in our study constitute important resources for delving into the evolution and ecology of secondary compounds mediating plant-insect interactions.
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Affiliation(s)
- Ivan M De-la-Cruz
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
- Department of Plant Protection Biology, Swedish University of Agricultural Sciences, Lomma, Alnarp 230 53, Sweden
| | - Ken Oyama
- Escuela Nacional de Estudios Superiores (ENES), Universidad Nacional Autónoma de México (UNAM), Campus Morelia, Morelia, Michoacán 8701, Mexico
| | - Juan Núñez-Farfán
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
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Santos-Aguilar P, Bernal-Ramírez J, Vázquez-Garza E, Vélez-Escamilla LY, Lozano O, García-Rivas GDJ, Contreras-Torres FF. Synthesis and Characterization of Rutile TiO 2 Nanoparticles for the Toxicological Effect on the H9c2 Cell Line from Rats. ACS Omega 2023; 8:19024-19036. [PMID: 37273591 PMCID: PMC10233665 DOI: 10.1021/acsomega.3c01771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 04/27/2023] [Indexed: 06/06/2023]
Abstract
The widespread use of titanium dioxide (TiO2) has raised concerns about potential health risks associated with its cytotoxicity in the cardiovascular system. To evaluate the cytotoxicity of TiO2 particles, the H9c2 rat cardiomyoblasts were used as a biological model, and their toxicological susceptibility to TiO2-anatase and TiO2-rutile particles was studied in vitro. The study examined dose and time exposure responses. The cell viability was evaluated based on metabolic inhibition and membrane integrity loss. The results revealed that both TiO2-anatase and TiO2-rutile particles induced similar levels of cytotoxicity at the inhibition concentrations IC25 (1.4-4.4 μg/cm2) and IC50 (7.2-9.3 μg/cm2). However, at more significant concentrations, TiO2-rutile appeared to be more cytotoxic than TiO2-anatase at 24 h. The study found that the TiO2 particles induced apoptosis events, but necrosis was not observed at any of the concentrations of particles used. The study considered the effects of microstructural properties, crystalline phase, and particle size in determining the capability of TiO2 particles to induce cytotoxicity in H9c2 cardiomyoblasts. The microstress in TiO2 particles was assessed using powder X-ray diffraction through Williamson-Hall and Warren-Averbach analysis. The analysis estimated the apparent crystallite domain and microstrain of TiO2-anatase to be 29 nm (ε = 1.03%) and TiO2-rutile to be 21 nm (ε = 0.53%), respectively. Raman spectroscopy, N2 adsorption isotherms, and dynamic light scattering were used to identify the presence of pure crystalline phases (>99.9%), comparative surface areas (10 m2/g), and ζ-potential values (-24 mV). The difference in the properties of TiO2 particles made it difficult to attribute the cytotoxicity solely to one variable.
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Affiliation(s)
- Pamela Santos-Aguilar
- Escuela
de Ingeniería y Ciencias, Tecnologico
de Monterrey, Monterrey, N.L. 64849, Mexico
| | - Judith Bernal-Ramírez
- Escuela
de Medicina y Ciencias de la Salud, Tecnologico
de Monterrey, Monterrey, N.L. 64460, Mexico
| | - Eduardo Vázquez-Garza
- Escuela
de Medicina y Ciencias de la Salud, Tecnologico
de Monterrey, Monterrey, N.L. 64460, Mexico
| | | | - Omar Lozano
- Escuela
de Medicina y Ciencias de la Salud, Tecnologico
de Monterrey, Monterrey, N.L. 64460, Mexico
- The
Institute for Obesity Research, Tecnologico
de Monterrey, Monterrey, N.L. 64849, Mexico
| | - Gerardo de Jesús García-Rivas
- Escuela
de Medicina y Ciencias de la Salud, Tecnologico
de Monterrey, Monterrey, N.L. 64460, Mexico
- The
Institute for Obesity Research, Tecnologico
de Monterrey, Monterrey, N.L. 64849, Mexico
| | - Flavio F. Contreras-Torres
- Escuela
de Ingeniería y Ciencias, Tecnologico
de Monterrey, Monterrey, N.L. 64849, Mexico
- The
Institute for Obesity Research, Tecnologico
de Monterrey, Monterrey, N.L. 64849, Mexico
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