Pigmentos fotossintéticos em azevém suscetível e resistente ao herbicida glyphosate

Kaspary, Tiago Edu; Lamego, Fabiane Pinto; Peruzzo, Sabrina Tolotti; Pagliarini, I.B.; Rigon, Carlos Alberto Gonsiorkiewicz

doi:10.1590/0103-8478cr20131177

Cited by 9 publications

(13 citation statements)

References 13 publications

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“…This fact was not observed in the population considered susceptible, since it continued to show negative values. In susceptible plants, glyphosate may inhibit the synthesis of chlorophyll and carotenoids, considered as the basic photosynthetic unit (Kaspary et al, 2014), and reduce assimilation of CO 2 (Ding et al, 2011), among others. The consequence of these effects can be seen at 28 DAA, when the susceptible population was completely controlled by the herbicide regardless of the dose applied and it was not possible to make measurements.…”

Section: Cs Cr Cs Crmentioning

confidence: 99%

Influence of Glyphosate on Susceptible and Resistant Ryegrass Populations to Herbicide

et al. 2017

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-In Brazil, ryegrass (Lolium multiflorum) has been identified as resistant to glyphosate, becoming a major problem, especially in crops cultivated in the winter season. This herbicide can indirectly affect photosynthesis by inhibiting biosynthesis of many compounds. Thus, the aim of this study was to investigate the influence of glyphosate on the physiological profile of susceptible and resistant ryegrass populations to the herbicide. The experimental design was completely randomized with two treatments (720 and 1,080 g e.a. ha ) and four replications plus control with no treatment. Two ryegrass populations were sown, one susceptible and another one resistant to glyphosate. After the treatments, evaluations were carried out at 1, 3, 7 and 28 days after application (DAA). Variables analyzed were: CO 2 net assimilation rate, stomatal conductance, CO 2 internal concentration, transpiration, water use efficiency and instantaneous carboxylation efficiency. The glyphosate herbicide caused irreversible damage in a susceptible population which at 28 DAA in all variables analyzed this population was already dead and it was impossible to analyze it, but it was shown that the effects of this herbicide were intensified from the third day after application. In the case of the resistant population, at 3 DAA in all variables, it suffered significant effects comparing to the control, showing that even with a high level of resistance the herbicide can affect its metabolism. Keywords

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Section: Cs Cr Cs Crmentioning

confidence: 99%

Influence of Glyphosate on Susceptible and Resistant Ryegrass Populations to Herbicide

et al. 2017

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“…In contrast, portable chlorophyll meters use nondestructive, simple and instantaneous principles (Salla et al, 2007). In recent years, portable chlorophyll meters have been successfully used to measure the levels of photosynthetic pigments and leaf nitrogen content in different species (Ciganda et al, 2009;Rigon et al, 2012;Rigon et al, 2013;Kaspary et al, 2014a;Kaspary et al, 2014b;Cavalcante et al, 2016). Chlorophyll meters indirectly determine the relative chlorophyll content, which is calculated by the amount of light transmitted by the leaf measured at wavelengths with variable absorbance, providing a unique reading proportional to the contents of chlorophyll a, chlorophyll b, and carotenoids (Falker Automação Agrícola, 2009;Minolta Camera Company, 1989).…”

Section: Introductionmentioning

confidence: 99%

Non-destructive analysis of photosynthetic pigments in Avena strigosa and Avena sativa

et al. 2019

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Chlorophylls and carotenoids are the main photosynthetic pigments in plants. The photosynthetic potential of crop plants is used to determine the correct rate of nitrogen fertilization. To date, no studies have been conducted to understand the relationship between different methods of measurement of photosynthetic pigments in oats. The objective of this study was to quantify and compare the levels of photosynthetic pigments in Avena strigosa and A. sativa using two different methods, the extraction method and portable chlorophyll meter, and to determine whether the results of these two methods showed a significant correlation. Photosynthetic pigments were measured using both methods in a greenhouse and the laboratory at four developmental stages: tillering [28 days after sowing (DAS)], vegetative stage I (55 DAS), vegetative stage II (75 DAS), and reproductive stage (120 DAS). The same leaves were used to measure the relative chlorophyll content using a portable chlorophyll meter and extractable chlorophyll using the laboratory extraction method. The readings of the chlorophyll index differed for each developmental stage of both A. sativa and A. strigosa. The contents of chlorophyll a, chlorophyll b, and carotenoids determined using the extraction method showed high coefficients of correlation with the total chlorophyll index determined using the portable chlorophyll meter. Thus, the measurement of chlorophyll using the portable chlorophyll meter can be used for the accurate evaluation of the photosynthetic potential of oats, thus saving time and reagents.

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“…Models for chlorophyll and carotenoids (µmol m -2 ) contents in Acca sellowiana leaves and their respective adjusted coefficient of determination (R 2 ), mean absolute error (MAE) and concordance correlation coefficient (CCC) according to the The Clorofilog-1030 device is patented and has been commercially available since 2008. Since then, LP content estimation from FCI readings has been applied for Cotton plants -Gossypium hirsutum (Brito et al, 2011), Castor oil plant -Ricinus communis (Rigon et al, 2012b), Sesame -Sesamum indicum (Rigon et al, 2012a), Jatropha -Jatropha curcas (Rigon et al, 2013), Rubber tree -Hevea brasiliensis (Conforto et al, 2014), Italian ryegrass -Lolium multiflorum (Kaspary et al, 2014), and six Brazilian Atlantic Forest native trees (Vieira Silva, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…One of the most frequently used indirect methods for estimating LA are mathematical models involving leaf length and/or leaf width (Peksen, 2007). While LP content can be related to chlorophyll meter readings using a portable Clorofilog-1030 (Brito et al, 2011;Rigon et al, 2012a, b;Conforto et al, 2014;Kaspary et al, 2014). For LA, the mathematical models are species-specific (Demirsoy, 2009), although they can also vary among cultivars (Buttaro et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Non-destructive measurement of leaf area and leaf pigments in feijoa trees

Sachet

Citadin

Guerrezi

et al. 2019

Rev. bras. eng. agríc. ambient.

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Leaf area (cm2 per leaf) and leaf pigment content are important traits that can be used to better understand a plants physiology. In this study, empirical non-destructive models for leaf area and leaf pigment based on the leaf dimensions, length (L) and width (W) in centimeters, and chlorophyll meter readings were developed for feijoa (Acca sellowiana). The experiment was carried out during January 2016 using five-year-old trees of 60 genotypes, grown under field conditions in the state of Paraná, Brazil. The proposed leaf area (LA) model was L A = 0 . 0022 L 3 + 0 . 1482 W 2 + 0 . 6159 L W + 0 . 1076 (R2 = 0.99). Three current leaf area models found in the literature were also assessed. All of the already created models were less accurate than the model proposed in this article. The proposed leaf pigment models were based on the Falker Chlorophyll Index for Chlorophyll a (A) and b (B), these were C h l a = 2 . 564 A + 13 . 098 B - 42 . 605 (R2 = 0.94), C h l b = 1 . 538 A + 3 . 287 B + 8 . 847 (R2 = 0.86) and C a r o t e n o i d s = 0 . 947 B + 8 . 943 (R2 = 0.88) expressed as µmol m-2 of leaf blade. In conclusion, the proposed models in this study were shown to be a reliable non-destructivel way of estimating A. sellowiana leaf area and leaf pigment.

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Pigmentos fotossintéticos em azevém suscetível e resistente ao herbicida glyphosate

Abstract: RESUMO O objetivo deste trabalho foi quantifi car o teor de pigmentos fotossintéticos em biótipos de azevém (Lolium

Cited by 9 publications

References 13 publications

Influence of Glyphosate on Susceptible and Resistant Ryegrass Populations to Herbicide

Influence of Glyphosate on Susceptible and Resistant Ryegrass Populations to Herbicide

Non-destructive analysis of photosynthetic pigments in Avena strigosa and Avena sativa

Non-destructive measurement of leaf area and leaf pigments in feijoa trees

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