Características da anatomia foliar de espécies de braquiária e sua relação com a sensibilidade a herbicidas

Marques, Renata Pereira; Rodella, Roberto Antônio; Martins, D.

doi:10.1590/s0100-83582012000400015

Cited by 11 publications

(9 citation statements)

References 15 publications

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“…For Marques et al (2012), foliar anatomical structures like epidermis, vascular bundle, parenchyma, trichome and even leaf thickness may be associated to greater or lesser plant resistance to glyphosate, as well as to symptom description. Costa et al (2011) stated that leaf anatomical analysis could be used to identifying susceptible, tolerant or resistant species to herbicides.…”

Section: Discussionmentioning

confidence: 99%

MORPHO-ANATOMICAL CHANGES OF PEQUI LEAVES (Caryocar brasiliense Cambess.) EXPOSED TO SIMULATED DRIFT OF GLYPHOSATE

et al. 2016

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-The goal of this research was to examine phytotoxicity and leaf anatomy of pequi plants (Caryocar brasiliense Cambess.) exposed to simulated drift of glyphosate. The experimental design was randomized blocks with nine replications. Each experimental unit was composed by one 18-L pot with one plant. The treatments consisted of different doses of glyphosate sprayed: 0 (control), 50, 100, 250, 500, 1000 and 1500 g ae ha -1 of glyphosate. Phytotoxicity visual ratings were carried out at 7, 14 and 21 days after spraying (DAS) by scores expressed in a percentage scale, within which zero and one hundred represent no symptom and plant death, respectively. Description of symptoms, changes in leaf anatomy and micromorphometric analysis were performed on leaves taken from plant top and middle third at 23 DAS. Poisoning symptoms were wilting, chlorosis followed by necrosis, winding of top leaves and leaf senescence, being intensified with increasing doses. Leaf anatomical changes were detected from the dose of 250 g ha- ALTERAÇÕES MORFO-ANATÔMICAS DE FOLHAS DE PEQUI (Caryocar brasiliense Cambess.) SUBMETIDAS À DERIVA SIMULADA DE GLIFOSATORESUMO -O objetivo desta pesquisa foi avaliar a fitointoxicação e a anatomia foliar de plantas de pequi (Caryocar brasiliense Cambess.) submetidas à deriva simulada do glifosato. O delineamento utilizado foi em blocos casualizados com nove repetições. A unidade experimental foi constituída por um vaso, com capacidade de 18 litros, contendo uma planta. Os tratamentos corresponderam à aplicação das doses de 0 (controle), 50, 100, 250, 500, 1000 e 1500 g e.a. ha -1 de glifosato. Avaliações visuais de fitointoxicação foram realizadas aos 7, 14 e 21 dias após a aplicação (DAA) dos tratamentos por meio de notas expressas em escala percentual, em que zero e cem representaram ausência de sintomas e morte das plantas, respectivamente. Descrição dos sintomas, alterações na anatomia foliar e micromorfometria foram realizadas em folhas do ápice e do terço médio aos 23 DAA. Os sintomas visuais de intoxicação foram murcha, clorose seguida de necrose, enrolamento das folhas dos ápices e senescência foliar, sendo intensificadas com o aumento das doses. As alterações anatômicas nas folhas foram detectadas a partir da dose de 250 g ha -1. Os danos causados foram células plasmolisadas, ruptura da epiderme, células alteradas, hiperplasia, células colapsadas, tecidos necrosados e acúmulo de compostos fenólicos.Palavras-chave: Contaminação ambiental; Fitointoxicação; Espécie arbórea.

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Section: Discussionmentioning

confidence: 99%

MORPHO-ANATOMICAL CHANGES OF PEQUI LEAVES (Caryocar brasiliense Cambess.) EXPOSED TO SIMULATED DRIFT OF GLYPHOSATE

et al. 2016

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“…However, longer distances between vascular bundles may reflect on lower transport capacity (Marques et al, 2012). Different T. angustifolia populations may develop different adaptations on the adaxial and abaxial sides of its leaves.…”

Section: Spd (μM)mentioning

confidence: 99%

Anatomy and physiology of Cattail as related to different population densities

et al. 2015

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-The objective of this work was to evaluate the effects of the population density of Typha angustifolia plants in the anatomical and physiological characteristics. Plants were collected from populations of high density (over 50% of colonization capacity) and low density (less than 50% of colonization capacity) and cultivated under controlled greenhouse conditions. Plants from both populations were grown in plastic trays containing 4 L of nutritive solution for 60 days. At the end of this period, the relative growth rate, leaf area ratio, net assimilatory rate, root/shoot ratio, leaf anatomy, root anatomy, and catalase and ascorbate peroxidase activities were evaluated. Plants from high density populations showed increased growth rate and root/shoot ratio. Low density populations showed higher values of stomatal index and density in leaves, as well as increased palisade parenchyma thickness. Root epidermis and exodermis thickness as well as the aerenchyma proportion of high density populations were reduced, these plants also showed increased vascular cylinder proportion. Only catalase activity was modified between the high and low density populations, showing increased values in low density populations. Therefore, different Typha angustifolia plants show differences in its anatomy and physiology related to its origins on high and low density conditions. High density population plants shows increased growth capacity related to lower apoplastic barriers in root and this may be related to increased nutrient uptake capacity.Keywords: macrophytes, Typha angustifolia, morphological plasticity, plant growth, ecological plant anatomy. RESUMO -O objetivo do trabalho foi avaliar os efeitos da origem em diferentes densidades populacionais de

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“…Polar or hydrophilic herbicides (Kow <10) use pectin filaments, which can cross the cuticle if they are hydrated, as an absorption route. Marques et al (2012) noted that the leaf anatomical structures can be related to a greater or lesser sensitivity of plants to herbicides and are important for chemical management. However, little is known about the contribution of each structural characteristic of the leaf to the process of absorption and translocation of herbicides.…”

Section: Plantmentioning

confidence: 99%

Leaf-surface characterization and the effects of the herbicide saflufenacil on the leaves of weeds

Alves

Júnior

Monquero

et al. 2014

Agraria

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Effects of saflufenacil in Merremia aegyptia (Convolvulaceae), Luffa aegyptiaca (Cucurbitaceae) and Mucuna aterrima (Fabaceae -Leguminosae) were analyzed by scanning electron microscopy one day before and after application. Stomatal density, stomatal index and length of the stomatal aperture were determined by imprinting the leaf epidermis. These species showed stomata on the adaxial and abaxial epidermis. M. aegyptia showed paracytic stomata, unicellular tector trichomes on the abaxial surfaces, especially around leaf veins, and absence of epicuticular wax crystals. L. aegyptiaca was characterized by having anomocytic stomata, glandular trichomes and multicellular trichomes on both sides of the leaf, and did not have epicuticular wax crystals. M. aterrima showed anisocitic stomata, glandular and unicellular trichomes on both sides as well as a large amount of epicuticular wax crystals. The herbicide saflufenacil promoted dispersion of waxes, epidermal surface roughness and depletion of trichomes on L. aegyptiaca and M. aterrima plants. There were significant differences in the stomatal index, density and length of stomatal aperture among the studied species.Key words: retention, stomatal density, trichomes, wax Caracterização da superfície foliar e efeito de saflufenacil sobre as folhas de plantas daninhas RESUMOAs características foliares de Merremia aegyptia (Convolvulaceae), Luffa aegyptiaca (Cucurbitaceae) and Mucuna aterrima (Fabaceae -Leguminosae) foram analisadas por microscopia eletrônica de varredura, antes e um dia após a aplicação do herbicida saflufenacil. A densidade, o índice e a abertura estomática, foram determinados através da impressão da epiderme foliar. As espécies apresentaram estômatos presentes na epiderme adaxial e abaxial. M. aegyptia mostrou estômatos paracíticos, tricomas tectores unicelulares na superfície abaxial, especialmente ao redor das nervura das folhas e ausência de cristais de ceras epicuticulares. L. aegyptiaca foi caracterizada por possuir estômatos anomocíticos, tricomas glandulares e tricomas multicelulares, em ambos os lados da folha e sem a presença de cristais de ceras. M. aterrima mostrou estômatos anisocíticos, tricomas glandulares e unicelulares, em ambos os lados, tal como grande quantidade de cristais de cera epicuticulares. O saflufenacil promoveu dispersão de ceras, rugosidade na superfície epidérmica das plantas de L. aegyptiaca e M. aterrima. Houve diferenças significativas no índice estomático, densidade e comprimento da abertura estomática entre as espécies estudadas.

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Características da anatomia foliar de espécies de braquiária e sua relação com a sensibilidade a herbicidas

Cited by 11 publications

References 15 publications

MORPHO-ANATOMICAL CHANGES OF PEQUI LEAVES (Caryocar brasiliense Cambess.) EXPOSED TO SIMULATED DRIFT OF GLYPHOSATE

MORPHO-ANATOMICAL CHANGES OF PEQUI LEAVES (Caryocar brasiliense Cambess.) EXPOSED TO SIMULATED DRIFT OF GLYPHOSATE

Anatomy and physiology of Cattail as related to different population densities

Leaf-surface characterization and the effects of the herbicide saflufenacil on the leaves of weeds

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