1998
DOI: 10.1006/anbo.1998.0683
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Effect of Irradiance on Chlorophyll Estimation with the Minolta SPAD-502 Leaf Chlorophyll Meter

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Cited by 166 publications
(95 citation statements)
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“…67 (2010) 108 F. Silla et al Thompson et al, 1996). Second, chloroplasts can modify their orientation in response to incident irradiance (Haupt and Scheuerlein, 1990), and seasonal changes in irradiance could affect chlorophyll meter readings, as reported for the natural night-day-night cycle (Hoel and Solhaug, 1998). Accordingly, leaf structural changes that affect absorption, transmission and scattering of light across the leaf could provide different CCI readings even though the chlorophyll content per unit area has not changed.…”
Section: Discussionmentioning
confidence: 99%
“…67 (2010) 108 F. Silla et al Thompson et al, 1996). Second, chloroplasts can modify their orientation in response to incident irradiance (Haupt and Scheuerlein, 1990), and seasonal changes in irradiance could affect chlorophyll meter readings, as reported for the natural night-day-night cycle (Hoel and Solhaug, 1998). Accordingly, leaf structural changes that affect absorption, transmission and scattering of light across the leaf could provide different CCI readings even though the chlorophyll content per unit area has not changed.…”
Section: Discussionmentioning
confidence: 99%
“…Os valores SPAD ("Soil Plant Analysis Development") são calculados, pelo equipamento, com base na quantidade de luz transmitida pela folha, em dois comprimentos de onda, 650 hm e 940 ηm, com diferentes absorvâncias da clorofila (Hoel & Solhaug, 1998). Considerando-se que o SPAD-502 realiza leituras de modo não destrutivo e preciso, e que os valores obtidos são proporcionais ao teor relativo de clorofila presente na folha (Hoel & Solhaug, 1998;Egert & Tevini, 2002;Torres Netto et al, 2002;Chang & Robinson, 2003), optou-se por estimar os efeitos dos níveis hídricos, em cada época de colheita, sobre o teor relativo de clorofila com base na leitura desse equipamento. A medição foi feita unicamente com o clorofilômetro, com o intuito de apenas comparar os níveis de clorofila entre os tratamentos, e não de estabelecer o teor de clorofila nas plantas de artemísia.…”
Section: Methodsunclassified
“…The largest chlorophyll and proline accumulation in the expanded leaves of the plants under water deficiency can be used as a stress indicative. gião em que a clorofila absorve luz, e transmissão de luz infravermelha a 940 ηm, onde nenhuma absorção ocorre (Hoel & Solhaug, 1998). É um instrumento utilizado na associação do teor relativo de clorofila das folhas com valores unidimensionais (índice de intensidade da cor verde) estabelecidos por esse medidor A relação entre teor de clorofila e leituras do SPAD-502 foram estabelecidas em várias espécies de plantas como arroz, milho, trigo, mamão, entre outras (Torres Netto et al, 2002).…”
Section: Introductionunclassified
“…It 63 measures the leaf transmittance in red light at 650 nm (at 64 which chlorophyll absorbs) and in near-infrared light at 65 940 nm (for the correction of leaf thickness). The ratio 66 of these two transmission values is referred to as SPAD 67 reading or SPAD value (Hoel and Solhaug 1998). 68 Generally, SPAD measurement is performed on the first 69 fully expanded leaf or on flag leaves at different 70 developmental stages.…”
Section: U N C O R R E C T E D P R O O F U N C O R R E C T E D P R O mentioning
confidence: 99%