Seasonal Variation and Threshold Values for Chlorophyll Meter Readings on Leaves of Potato Cultivars

Busato, Camilo; Fontes, Paulo Cézar Rezende; Braun, Heder; Cecon, Paulo Roberto

doi:10.1080/01904167.2010.519087

Cited by 19 publications

(28 citation statements)

References 26 publications

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“…Unlike, the portable readers of chlorophyll use non-destructive, simple and instant principles, allowing leaf ontogenetic studies of the crops (Salla et al, 2007). Portable chlorophyll meters are being used successfully in the determination of photosynthetic pigments in different species, as reported by Torres Netto;Campostrini, (2005) in coffee (Coffea arabica); Ciganda et al (2009) in corn (Zea mays); Busato et al (2010) in potato (Solanum tuberosum); Rigon et al (2012Rigon et al ( , 2013 in sesame (Sesamum indicum) and Jatropha (Jatropha curcas); and by Brito et al (2011) …”

Section: Introductionmentioning

confidence: 99%

Determination of photosynthetic pigments in fleabane biotypes susceptible and resistant to the Herbicide Glyphosate

et al. 2014

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-Chlorophylls and carotenoids are the main photosynthetic pigment in plants. In the weeds, the greatest amount of photosynthetic pigments can result in high competitiveness of the species. The aim of this study was to quantify the content of photosynthetic pigments in biotypes of fleabane (Conyza bonariensis) susceptible and resistant to glyphosate, by two different methods, as well as a correlation between chlorophyll content obtained by portable and classical methodology (extractable chlorophyll). An experiment was conducted in greenhouse and laboratory, 2 x 5 factorial scheme, where factor A was equivalent to biotypes of fleabane (resistant and susceptible to glyphosate) and factor B to developmental stages plants (rosette vegetative I, II and III and reproduction). At all stages of development, fleabane plants were evaluated with the portable determiner (chlorophyll content) and then the same leaves were subjected to classical methodology laboratory (extractable pigments). The resistant biotype of fleabane showed higher contents of chlorophyll a, b, and total carotenoids, inferring a greater competitive potential regarding the susceptible population to the herbicide. The portable determiner of chlorophyll showed high correlation with the classical method of determination of photosynthetic pigments, and can thus be used to accurately assess this, saving time and reagents.Keywords: Conyza bonariensis, chlorophyll, carotenoids, resistance. (roseta, vegetativo I, II e III, e reprodutivo RESUMO -Clorofilas e carotenoides são os principais pigmentos fotossintéticos em plantas. Nas plantas daninhas, a maior quantidade de pigmentos fotossintéticos pode resultar em elevada competividade da espécie. O objetivo deste trabalho foi quantificar o teor de pigmentos fotossintéticos em biótipos de buva (Conyza bonariensis) suscetível e resistente ao herbicida glyphosate, por dois diferentes métodos, bem como estabelecer uma correlação entre o índice de clorofila obtido pelo equipamento portátil e a metodologia clássica (clorofila extraível). Um experimento foi conduzido em casa de vegetação e laboratório, em esquema fatorial 2 x 5, em que o fator A equivaleu aos biótipos de buva (resistente e suscetível a glyphosate) e o fator B, a estádios de desenvolvimento das plantas

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Section: Introductionmentioning

confidence: 99%

Determination of photosynthetic pigments in fleabane biotypes susceptible and resistant to the Herbicide Glyphosate

et al. 2014

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“…The most commonly used equipment for the evaluation of N nutritional status in real time are: the analysis of the N-NO 3 content in the sap of the petiole using microelectrode (Brink et al, 2002) and the indicator strip selected for nitrate (Parks et al, 2012). Additionally, SPAD chlorophyll meter readings have been shown to correlate well to laboratory-extracted chlorophyll (León et al, 2007), and to N status in culture of lettuce (Fontes et al, 1997), wheat (Tremblay et al, 2010), potato (Gil et al, 2002;Silva et al, 2009, Busato et al, 2010, tomato (Fontes and Araujo, 2006) and rice (Cabangon et al, 2011). Other equipment have been used as a tool to evaluate N nutritional status are Dualex ® (Coelho et al, 2012) and the digital camera (Li et al, 2010;Wang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…N concentration and critical N dilution curve have been used as destructive techniques. Nondestructive techniques based on leaf reflectance have been proposed as robust alternative and simple methods for pigment quantification in leaves (Silva et al, 2009;Busato et al, 2010;Coelho et al, 2012). The most commonly used equipment for the evaluation of N nutritional status in real time are: the analysis of the N-NO 3 content in the sap of the petiole using microelectrode (Brink et al, 2002) and the indicator strip selected for nitrate (Parks et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Top-dressing nitrogen management decision in potato using the UFV-80 color chart and SPAD readings

Braun¹,

Silva²,

Fontes³

et al. 2015

Afr. J. Agric. Res.

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The chlorophyll meter (SPAD-502) and "UFV-80" color chart can be used to diagnose the nitrogen (N) nutritional status of potato plants to determine the need for fertilizer-N topdressing. The present investigation was focused on how chlorophyll meter and "UFV-80" color chart help in determining optimal N management through real time N application for improving yield and profitable rate in potato crop. The experiments, in two planting seasons (dry and wet), were carried out a split-plot design in a randomized complete blocks with four repetitions. In the whole plot, five N fertilization rates (0, 50, 100, 200 and 300 kg ha -1 of N) were applied before planting. In the half of plot area, N fertilization rates (42, 152, 152, 152 and 152 kg ha -1 of N at dry season and 133, 93, 69, 58 and 205 kg ha -1 of N in wet season) were or did not applied in top-dressing, depending on the UFV-80 color chart reading and SPAD chlorophyll meter reading in the terminal leaflet of the fourth leaf, at 21 day after the plant emergency (DAE). At 77 and 70 DAE for the dry and wet seasons, respectively, the plants were harvested to determine the commercial tuber yield. The SPAD chlorophyll meter reading and "UFV-80" color chart can be used to determine N nutritional status in potato crops in both planting seasons. Both planting seasons, the commercial production was not influenced by the N fertilization rates in pre-planting and top-dressing.

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“…Although there are a number of studies establishing indices to assess the nitrogen status of potato plants Junior Sampaio et al, 2008, Silva et al, 2009, 2011Braun et al, 2010;Busato et al, 2010;Coelho et al, 2010;Fontes et al, 2010;Moreira et al, 2011a) and the nitrogen management in minitubers production in vases and other systems containing substrate (Junior Sampaio, 2005 ;Moreira, 2008), there is still a lack of research to determine the critical value of these indices in the production system of basic seed potatoes multiplication by sprouts in substrate. This study aimed to determine the optimal dose of nitrogen (N) in the production of basic seed potatoes minitubers and to evaluate the effect of nitrogen (N) rates on nitrogen and physiological indices both in the youngest fully developed leaf (fourth leaf) and in the oldest leaf at 60 days after planting.…”

Section: Introductionmentioning

confidence: 99%

Production of basic potato seed minitubers in substrate and different nitrogen rates

Souza

Fontes

Moreira³

et al. 2012

Rev. Ceres

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RESUMO Produção de minitubérculos de batata-semente básica em substrato em razão de doses de nitrogênioA dose ótima de nitrogênio (N) na cultura da batata depende do sistema de produção. O objetivo deste trabalho foi determinar a dose ótima de N para a produção de minitubérculos de batata-semente básica e avaliar o efeito de doses de N sobre índices nitrogenados e fisiológicos determinados na folha mais jovem completamente desenvolvida (quarta folha) e na folha mais velha da planta, aos 60 dias após o plantio. O experimento foi realizado em ambiente protegido, no Departamento de Fitotecnia da Universidade Federal de Viçosa. Os tratamentos foram constituídos por cinco doses de N (0, 45, 90, 180 e 360 mg dm -3 ), sendo 10% de cada dose aplicada em pré-plantio e o restante via água de irrigação, diariamente, por 30 dias. As doses de N influenciaram positivamente os índices fisiológicos (comprimento, largura, área foliar, número de folíolos, massas de matérias fresca e seca) e nitrogenados (teor e conteúdo de N e N-NO 3 na matéria seca e índice SPAD) tanto na quarta folha quanto na folha velha. Da mesma forma, doses de N influenciaram positiva- The optimal dose of nitrogen (N) in potato crop depends on the production system. The objective of this study was to determine the optimal dose of N for the production of basic potato seed minitubers and evaluate the effect of N rates on physiological and nitrogen indices in the youngest fully developed leaf (fourth leaf) and in the oldest leaf of the plants at 60 days after planting. The experiment was conducted in a greenhouse at the Departamento de Fitotecnia da Universidade Federal de Viçosa. The treatments consisted of five N rates (0, 45, 90, 180 and 360 mg dm -3 ), with 10% of each dose applied at planting and the remainder through irrigation water, daily, for 30 days. The nitrogen rates positively influenced the physiological indices (length, width, leaf area, number of leaves, fresh mass and dry mass) and nitrogen in the dry mass and SPAD) both in the fourth leaf and in the oldest leaf. Likewise, the N rates positively influenced the number and mass of harvested tubers. The largest number (5.44 tubers/plant) and the maximum mass of tubers (243.5 g/plant) were obtained with 360.0 and 332.9 mg N dm -3 , respectively. Therefore, the mass and number of tubers were not optimized by the same N rate. The critical SPAD index was 38.8 in the fourth leaf, which was more sensitive to the effect of N rates than the oldest leaf.

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Seasonal Variation and Threshold Values for Chlorophyll Meter Readings on Leaves of Potato Cultivars

Cited by 19 publications

References 26 publications

Determination of photosynthetic pigments in fleabane biotypes susceptible and resistant to the Herbicide Glyphosate

Determination of photosynthetic pigments in fleabane biotypes susceptible and resistant to the Herbicide Glyphosate

Top-dressing nitrogen management decision in potato using the UFV-80 color chart and SPAD readings

Production of basic potato seed minitubers in substrate and different nitrogen rates

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