Padrão estomático de Capsicum ssp. resistentes e suscetíveis a Oidiopsis haplophylli

Lima, Milton Luiz da Paz; Lopes, C. A.; Filho, Adalberto Corrêa Café

doi:10.1590/s0100-54052010000100004

Cited by 6 publications

(2 citation statements)

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“…For the other genotypes, according to the results of the present study, no relation between disease severity and ostiolar opening was found. This result corroborates the Lima, Lopes and Café Filho (2010) studies that no correlation between characteristics of ostiolar opening in Capsicum ssp plants and resistance to powdery mildew was observed.…”

Section: Discussionsupporting

confidence: 92%

Coffee genotypes morphophysiological adaptation under coffee leaf rust biotic stress

Viana

Azevedo

Pereira

et al. 2021

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The identification of morphophysiological traits responsible for a better plant behavior when infected is useful for cultivar selection, and become crucial for breeding. We investigated the morphophysiological behavior of coffee genotypes before and after inoculation with the pathogen Hemileia vastatrix, causal agent of coffee rust. With multivariate techniques we identified the characteristics that most contribute to total genetic divergence of the genotypes. Ten genotypes of Coffea arabica from the Germplasm Bank of Coffee from Minas Gerais were sown in a nursery and then take to a greenhouse with controlled temperature and humidity. After one month of acclimatization, the artificial inoculation with the fungus H. vastatrix was carried out. The anatomical and physiological evaluations were performed 1 day before inoculation and 160 days after inoculation. When the first symptom emerged, plants were evaluated according to a descriptive scale for coffee rust. We observed significant differences in rust severity and ostiole opening between genotypes. Different groups were formed by the K-means method, based on morphophysiological characteristics. This shows that genetic variability exists between the coffee genotypes evaluated before and after inoculation with the pathogen. The most important characteristics that contributed to the total genetic divergence were xylem vessel diameter and stomatal conductance. In conclusion, inoculation with H. vastatrix caused a change in coffee genotypes based on morphophysiological characteristics.

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Section: Discussionsupporting

confidence: 92%

Coffee genotypes morphophysiological adaptation under coffee leaf rust biotic stress

Viana

Azevedo

Pereira

et al. 2021

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“…Concenço et al (2007), trabalhando com plantas de azevém, observaram que o biótipo resistente foi mais eficiente que o suscetível quanto ao uso da água, devido ao menor tempo de abertura estomática. Já Lima et al (2010), estudando o padrão estomático em pimentões, verificaram que maiores números e frequências de estômatos em ambas as faces foliares ocorreram em pimentão Magali (altamente suscetível), com valores significativamente maiores do que em HV-12 (altamente resistente).…”

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Anatomia foliar comparativa em espécies de guanxuma

et al. 2013

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O estudo da anatomia e morfologia das plantas pode ajudar a conhecer prováveis mecanismos que promovem maior capacidade competitiva pelos recursos naturais, principalmente água, luz e nutrientes, além da maior capacidade na retenção e/ou impedimento no processo de penetração de produtos químicos pelas folhas. Diante disso, o objetivo desta pesquisa foi estudar a anatomia foliar das espécies Sida urens, Sida spinosa e Sida rhombifolia em diferentes etapas de desenvolvimento. Essas espécies foram coletadas em três estádios fenológicos, caracterizados como V1: formação de até 10 folhas completamente expandidas; V2: entre 11 folhas e antes do florescimento; e R: após florescimento. O trabalho foi conduzido em duas etapas, sendo uma relacionada às atividades de cortes anatômicos e a outra às impressões paradérmicas das folhas. A espécie Sida spinosa apresentou maior densidade estomática na fase R. As três espécies apresentaram menor densidade estomática, maior densidade tricomática e parede celular mais espessa no estádio V2. Conclui-se que as três espécies possuem maior conteúdo de cera epicuticular na fase vegetativa, porém S. spinosa apresenta relativa diminuição nessa característica na fase reprodutiva.

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Association of leaf micro-morphological characters with powdery mildew resistance in field-grown mulberry (Morus spp.) germplasm

et al. 2011

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Background and aimsMicro-morphological characteristics can influence fungal infectivity. We sought links between micro-morphology and resistance to powdery mildew in mulberry with the intention of assisting selection of disease-resistant lines.MethodologyOver 3 years and under field conditions, we evaluated 30 lines of mulberry with contrasting susceptibilities to powdery mildew (15 resistant and 15 susceptible). Disease severity was related statistically to stomatal area, stomatal density, stomatal index, upper and lower cuticular thicknesses, leaf thickness and trichome density.Principal resultsDifferences between lines were significant (P <0.05) for all characters studied. Variation between the resistant and susceptible groups was statistically highly significant (P <0.01) for stomatal index, stomatal area and trichome density. The powdery mildew-resistant group was distinguished by 17.4 % lower stomatal density, 12.5 % smaller stomatal index per unit leaf area, 20.0 % greater trichome density and 18.0 % higher stomatal area compared with the susceptible group. Trichome density was negatively correlated with disease severity index and with the accumulative area under disease progression curves. Stomatal density was positively correlated with both measures of disease severity. Although stomatal area was negatively related to disease severity index (r = −0.28; P <0.05), the correlation was weak. There was no statistically significant relationship between stomatal area and the accumulative area under disease progression curves. The germplasm was partitioned into seven sub-groups based on hierarchical cluster analysis derived from pooled disease severity index scores and three highly significant micro-morphological characters. Eighty per cent of the resistant germplasm accumulated in three cluster components (A1, A2 and B2) characterized by high trichome densities and a high stomatal density and stomatal index.ConclusionsResistance to powdery mildew in mulberry is associated with trichome and stomatal features rather than leaf and epidermal thicknesses. Trichome density, stomatal density and stomatal index are shown to be promising markers for screening powdery mildew resistance in breeding programmes.

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Padrão estomático de Capsicum ssp. resistentes e suscetíveis a Oidiopsis haplophylli

Cited by 6 publications

References 6 publications

Coffee genotypes morphophysiological adaptation under coffee leaf rust biotic stress

Coffee genotypes morphophysiological adaptation under coffee leaf rust biotic stress

Anatomia foliar comparativa em espécies de guanxuma

Association of leaf micro-morphological characters with powdery mildew resistance in field-grown mulberry (Morus spp.) germplasm

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