Insect Footsteps on Leaves Stimulate the Accumulation of 4-Aminobutyrate and Can Be Visualized through Increased Chlorophyll Fluorescence and Superoxide Production

Bown, Alan W.; Hall, D. H.; MacGregor, Kennaway B.

doi:10.1104/pp.006114

Cited by 111 publications

(69 citation statements)

References 25 publications

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“…As pequenas oscilações do ETR ocorridas ao longo do período avaliado devem-se às condições do ambiente, visto que a capacidade fotossintética das plantas pode ser alterada por estresses bióticos ou abióticos pelos quais as plantas podem passar, como temperatura, radiação, deficiência hídrica, salinidade, presença de insetos ou fungos, entre outros (Bown et al, 2002;Oliveira et al, 2002). Para B. decumbens (Figura 2), com quatro horas após a disponibilidade do herbicida em solução ocorreu redução de 17% do ETR para a folha adulta, em relação ao valor de ETR inicial das folhas sem herbicida.…”

Section: Resultsunclassified

Efeitos na taxa de transporte de elétrons de plantas daninhas após aplicação de amicarbazone

Araldi¹,

Velini

Girotto³

et al. 2011

Planta daninha

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RESUMO -Entre os herbicidas registrados para cana-de-açúcar, o amicarbazone é um dos mais importantes para o controle das plantas daninhas, sendo preciso que o herbicida seja absorvido, translocado e que ele alcance os cloroplastos das células das folhas para atuar em seu sítio de ligação no fotossistema II. O objetivo deste trabalho foi avaliar os efeitos da aplicação do amicarbazone na taxa de transporte de elétrons (ETR) de Ipomoea grandifolia, Brachiaria decumbens e Digitaria horizontalis. Foi verificada a resposta dessas plantas daninhas, em relação à ETR, quando submetidas ao amicarbazone em solução e na sequência à solução sem herbicida, por meio de leituras da ETR, realizadas em folhas novas e adultas com o uso de um fluorômetro portátil. Verificou-se também o consumo de água das plantas daninhas pela pesagem diária dos recipientes contendo a solução e as plantas. Assim, verificou-se por meio do experimento que a redução dos valores da ETR pode ser utilizada para indicar o nível de intoxicação nas plantas daninhas em estudo. As plantas daninhas I. grandifolia, B. decumbens e D. horizontalis apresentaram respostas diferenciadas quando submetidas a solução sem herbicida após solução com amicarbazone. I. grandifolia apresentou-se mais sensível ao amicarbazone devido à maior dificuldade em recuperar os níveis iniciais de ETR, além de apresentar alterações nas folhas novas após o termino de fornecimento do herbicida. O consumo de água pode explicar esse comportamento em I. grandifolia, visto tratar-se da espécie que mais consumiu água e, consequentemente, mais absorveu o amicarbazone. Já para B. decumbens e D. horizontalis ocorreram menores níveis de absorção de água e, por conseguinte, as folhas velhas tiveram melhor recuperação do transporte de elétrons e não houve intoxicação em folhas novas. Palavras-chave: ETR, fluorescência, fluorômetro, intoxicação.ABSTRACT -Amicarbazone is one of the most important herbicides registered for weed control in sugarcane. It must be absorbed, translocated, and reach the chloroplasts of leaf cells to act on its binding site in the photosystem II. The objective of this work was to evaluate the effects of applying amicarbazone on the electron ltransport rate (ETR) of Ipomoea grandifolia, Brachiaria decumbens and Digitaria horizontalis. The response of these weeds to ETR, was verified when submitted to amicarbazone in solution and in sequence to the solution without herbicide, by ETR readings on adult and young leaves, using a portable fluorometer. Water consumption by the weeds was also verified by daily weighing of the containers with the solution and the plants. Thus, the experiment showed that the reduction of the ETR values may be used to indicate the level of intoxication in the weeds studied. The weeds I. grandifolia, B. decumbens and D. horizontalis showed different responses when exposed to herbicide-free solution after the solution with amicarbazone. I. grandifolia was more sensitive to amicarbazone due to the greater difficulty in recovering the initial ETR values, ...

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Section: Resultsunclassified

Efeitos na taxa de transporte de elétrons de plantas daninhas após aplicação de amicarbazone

Araldi¹,

Velini

Girotto³

et al. 2011

Planta daninha

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“…In fact, the activity of chlorophyll has been analyzed to understand the changes in photosynthesis caused by biotic or abiotic stresses, such as temperature (Oliveira et al, 2002), radiation (Mazza et al, 2000), water deficiency (Silva et al, 2006), salinity (Belkhodja et al, 1994), presence of insects (Bown et al, 2002) and herbicides (Ferreira et al, 2015). According to Baker and Rosenqvist (2004), under the effect of herbicide the reduction of chlorophyll activity occurs due to the reduction in the capture efficiency of the excitation energy by the reaction centers opened by PS II, which generates reduction in the quantum yield of the electron transport.…”

Section: (A) (B) (C) (D)mentioning

confidence: 99%

CHLOROPHYLL FLUORESCENCE IN Brachiaria decumbens AND Brachiaria ruziziensis SUBMITTED TO HERBICIDES

et al. 2017

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“…Photosynthesis can be limited by a series of factors, and a growing number of techniques are now available, allowing a better understand of these processes. One of them is chlorophyll a fluorescence-a non-invasive technique used to assess physiological responses to herbivory (Bown et al 2002;Calatayud and Le Rü 2006;Chaerle and Van Der Straeten 2000). With this technique, it is possible to evaluate the impact of insect feeding on light reactions of plants, specifically on photosystem II (PSII) and I (PSI).…”

Section: Introductionmentioning

confidence: 99%

Impact of scale insect infestation on the content of photosynthetic pigments and chlorophyll fluorescence in two host plant species

Golan

Rubinowska

Kmieć

et al. 2014

Arthropod-Plant Interactions

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The aim of this experiment was to determine plant responses to Coccus hesperidum L. infestation on two host plants. Groups of five lemon and five fern plants were colonised by various numbers of mobile C. hesperidum instar nymphs. After 6 months, all scale insect individuals were counted on each plant. According to the insect density, the plants were divided into a five-degree series. In all density classes of host plants tested, the infestation of scale insects decreased the chlorophyll and carotenoid content as well as the value of three indicators of photosynthetic activity. The strongest decrease in the analysed pigments was observed for the smallest abundance of insects (firstclass density) in lemon leaves and in second-class density in fern leaves. The strongest reactions of the chlorophyll fluorescence indicators were observed in density classes III and IV in the fern leaves and density classes IV or V in the lemon leaves. The reactions depended on the specific properties of plants and abundance of insects feeding on them.

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Insect Footsteps on Leaves Stimulate the Accumulation of 4-Aminobutyrate and Can Be Visualized through Increased Chlorophyll Fluorescence and Superoxide Production

Cited by 111 publications

References 25 publications

Efeitos na taxa de transporte de elétrons de plantas daninhas após aplicação de amicarbazone

Efeitos na taxa de transporte de elétrons de plantas daninhas após aplicação de amicarbazone

CHLOROPHYLL FLUORESCENCE IN Brachiaria decumbens AND Brachiaria ruziziensis SUBMITTED TO HERBICIDES

Impact of scale insect infestation on the content of photosynthetic pigments and chlorophyll fluorescence in two host plant species

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