Chlorophyll Fluorescence as a Tool in Cereal Crop Research

Sayed, O. H.

doi:10.1023/b:phot.0000015454.36367.e2

Cited by 243 publications

(155 citation statements)

References 148 publications

(137 reference statements)

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“…Chlorophyll fluorescence techniques have been used extensively to assess quickly and harmlessly plant responses to environmental stress (Sayed 2003). The responses of photosynthesis and fluorescence parameters to the soil water content indicated that Z. jujuba var.…”

Section: Discussionmentioning

confidence: 99%

Effect of soil water availability on photosynthesis in Ziziphus jujuba var. spinosus in a sand habitat formed from seashells: Comparison of four models

Xia¹,

Zhang²,

Wang³

et al. 2014

Photosynt.

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The photosynthetic and chlorophyll fluorescence parameters were studied in Ziziphus jujuba var. spinosus under different soil water gradients obtained by irrigation and natural water consumption. We used the rectangular hyperbola model, the nonrectangular hyperbola model, the exponential model, and the modified rectangular hyperbola model to fit our data and evaluate them quantitatively. Based on the relationship among the parameters, the effects of the availability of soil water on photosynthesis were elucidated. The results showed that: (1) The relationship between water content and photosynthetic parameters were fitted best by the modified rectangular hyperbola model, followed by the nonrectangular hyperbola model, the exponential model, and the rectangular hyperbola model. The modified rectangular hyperbola model fitted best the maximum net photosynthetic rate (PNmax) and the light-saturation point (LSP), while the nonrectangular hyperbola model fitted best the dark respiration rate (R D ), the apparent quantum yield (AQY), and the light-compensation point (LCP). (2) The main reason for the net photosynthetic rate (P N ) decline was that it reached a stomatal limit when the soil relative water content (RWC) was greater than 25% and it reached a nonstomatal limit when the RWC was lesser than 25%. Under these conditions, the photosynthetic apparatus of Z. jujuba was irreversibly damaged. (3) P max , R D , AQY, and LSP increased first and then decreased, while LCP increased contrary to the RWC. The P N light-response parameters reached optimum when the RWC was 56-73%. (4) The quantum yield of PSII photochemistry reached a maximum when RWC was 80%. Nonphotochemical quenching decreased rapidly, and the minimum fluorescence in the dark-adapted state increased rapidly when RWC was lesser than 25%. Under these conditions, PSII was irreversibly damaged. (5) The RWC range of 11-25% resulted in low productivity and low water use efficiency (WUE). The RWC range of 25-56% resulted in moderate productivity and moderate WUE, and the RWC range of 56-80% resulted in high productivity and high WUE. The RWC range of 80-95% resulted in moderate productivity and low WUE. In summary, photosynthesis of Z. jujuba was physiologically adaptable in response to water stress in sand formed from seashells. The photosynthetic and physiological activity was maintained relatively high when the RWC was between 56 and 80%; Z. jujuba seedlings grew well under these conditions. Additional key words: chlorophyll fluorescence, light-response model; photosynthetic productivity; relative water content. ---Received 5 October 2013, accepted 11 March 2014. +Corresponding author; fax:+865388249164, e-mail: zhsy@sdau.edu.cn Abbreviations: AQY -apparent quantum yield; Ci -intercellular CO2 concentration; E -transpiration rate; EM -exponential model FC -field capacity; Fm -maximum fluorescence of the dark-adapted state; Fm' -maximuml fluorescence yield; F0 -minimum fluorescence yield of the dark-adapted state; Fs -steady-state fluorescence; Fv/Fm...

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Section: Discussionmentioning

confidence: 99%

Effect of soil water availability on photosynthesis in Ziziphus jujuba var. spinosus in a sand habitat formed from seashells: Comparison of four models

Xia¹,

Zhang²,

Wang³

et al. 2014

Photosynt.

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“…O acúmulo continuado de sais no solo resulta em mudanças consideráveis em muitos processos fisiológicos das plantas, tais como: aumento da taxa respiratória e toxicidade por íons, decréscimo do crescimento, instabilidade na membrana plasmática, resultante do deslocamento de cálcio por sódio (Mansour & Salama, 2004), aumento na permeabilidade da membrana plasmática celular (Gupta et al, 2002) e depleção do teor de clorofila (Kao et al;2003;Sayed, 2003).…”

Section: Introductionunclassified

Crescimento e produtividade da mamoneira irrigada com diferentes diluições de esgoto doméstico tratado

Ribeiro

Rocha

Santos

et al. 2012

Rev. bras. eng. agríc. ambient.

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Objetivou-se avaliar, neste trabalho, os efeitos da irrigação com água de esgoto doméstico sobre as variáveis de crescimento e produtividade da mamoneira, genótipo EBDA MPB 01, em condições de campo. A pesquisa foi realizada no período de dezembro de 2009 a junho 2010, na Universidade Federal do Recôncavo da Bahia, Campus de Cruz das Almas. Foram estudadas quatro diferentes proporções de diluição de esgoto doméstico tratado em comparação com o tratamento testemunha (adubação e irrigação convencional), da seguinte forma: T1 - 100% do efluente tratado; T2 - 75% do efluente tratado mais 25% de água de poço artesiano; T3 - 50% do efluente tratado mais 50% de água de poço artesiano; T4 - 25% do efluente tratado mais 75% de água de poço artesiano e T5 - manejo convencional (adubação química e irrigação suplementar com água de poço artesiano). O delineamento experimental foi em blocos casualizados (DBC) com quatro blocos cada tratamento, constituindo de 20 parcelas experimentais. A produtividade da mamoneira não apresentou diferença estatística entre os tratamentos. O uso de água residuária de esgoto doméstico na cultura da mamoneira, não afetou as variáveis de crescimento analisadas.

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“…The reason is that the shape of the plant leaves' fluorescence spectra (360-800 nm) is inf luenced by many factors (Stober and Lichtenthaler 1993). These traditional RF/FRF and BGF/FRF (the fluorescence ratios red to farred and blue to far-red, respectively) parameters are insensitive to monitor the N variation in crops (Takeuchi et al 2002), and relative studies are rare in precisely inversing N content of crops (Sayed 2003, Janušauskaitė et al 2011). …”

mentioning

confidence: 99%

Application of fluorescence spectrum to precisely inverse paddy rice nitrogen content

Yang¹,

Shi²,

Gong³

et al. 2015

PLANT SOIL ENVIRON

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Paddy rice is important for Chinese agriculture and crop production, which largely depends on the leaf nitrogen (N) levels. The purpose of this study is to discuss the relationship between the fluorescence parameters and leaf N content of paddy rice and to test their performance in inversing N content of crops through back-propagation (B-P) neural network. In the correlative analysis of the fluorescence parameters and the N content, we found that the correlation between fluorescence ratios (F740/F685 and F685/F525 (F740, F685, F525 -intensity of fluorescence at 740, 685 and 525 nm, respectively)) and the N content (R 2 are 0.735 and 0.4342, respectively) is weaker than that between the intensity of fluorescence peaks (F685 and F740) and N content (R 2 are 0.9743 and 0.9686, respectively). Our studies show that the accuracy and precision of N content inversion which is acquired from the intensity of fluorescence peaks through the B-P neural network model are significantly improved (root mean square error (MSRE) = 0.1702, the residual changes between -0.1-0.1 mg/g) compared with the fluorescence ratio (MSRE = 0.3655, the residual changes from -0.3-0.3 mg/g). Results demonstrate that the intensity of fluorescence peaks can be as a characteristic parameter to estimate N content of crops leaf. The B-P neural network model will be serviceable approach in inversing N content of paddy leaf.

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Chlorophyll Fluorescence as a Tool in Cereal Crop Research

Cited by 243 publications

References 148 publications

Effect of soil water availability on photosynthesis in Ziziphus jujuba var. spinosus in a sand habitat formed from seashells: Comparison of four models

Effect of soil water availability on photosynthesis in Ziziphus jujuba var. spinosus in a sand habitat formed from seashells: Comparison of four models

Crescimento e produtividade da mamoneira irrigada com diferentes diluições de esgoto doméstico tratado

Application of fluorescence spectrum to precisely inverse paddy rice nitrogen content

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