Relationship between photochemical efficiency (JIP-Test Parameters) and portable chlorophyll meter readings in papaya plants

Castro, Fernanda Assumpção; Campostrini, Eliemar; Netto, Alena Torres; Viana, Leandro Hespanhol

doi:10.1590/s1677-04202011000400007

Cited by 20 publications

(17 citation statements)

References 21 publications

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“…The decrease in chlorophyll content is combined with the TR 0 /RC decline, which was confirmed by the report of Castro et al (2011). At stages I and II of development, the differences in TR 0 /RC and ET 0 /RC values between the leaves growing under L-R/FR and H-R/FR were statistically insignificant.…”

Section: Table 2 the Values Of Chlorophyll A Fluorescence Parameterssupporting

confidence: 79%

A Low Ratio of Red/Far-Red in the Light Spectrum Accelerates Senescence in Nest Leaves of Platycerium Bifurcatum

Oliwa¹,

Kornaś²,

Skoczowski³

2017

Acta Biologica Cracoviensia S. Botanica

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The fern Platycerium bifurcatum is a valuable component of the flora of tropical forests, where degradation of local ecosystems and changes in lighting conditions occur due to the increasing anthropogenic pressure. In ferns, phytochrome mechanism responsible for the response to changes in the value of R/FR differs from the mechanism observed in spermatophytes. This study analyzed the course of ontogenesis of nest leaves in P. bifurcatum at two values of the R/FR ratio, corresponding to shadow conditions (low R/FR) and intense insolation (high R/FR). The work used only non-destructive research analysis, such as measurements of reflectance of radiation from the leaves, their blue-green and red fluorescence, and the chlorophyll a fluorescence kinetics. This allowed tracing the development and aging processes in the same leaves. Nest leaves are characterized by short, intense growth and rapid senescence. The study identified four stages of development of the studied leaves related to morphological and anatomical structure and changing photochemical efficiency of PSII. Under the high R/FR ratio, the rate of ontogenesis of the leaf lamina was much slower than under the low R/FR value. As shown, the rapid aging of the leaves was correlated with faster decline of the chlorophyll content. It was shown that leaf senescence was accompanied by accumulation of polyphenols, anthocyanins and carotenoids on the basis of reflectance and fluorescence measurements in the blue-green range.Keywords: chlorophyll a fluorescence; fern; nest leaves; photomorphogenesis; R/FR ratio; reflectance Abbreviations:Area -surface area above the chlorophyll fluorescence induction curve; ARI -anthocyanin reflectance index; BRI -browning reflectance index; CRI 1 -carotenoid reflectance index; DI 0 /RC -total energy dissipation not trapped by the PSII reaction center; ET 0 /RC -rate of electron transfer by the active PSII reaction center; F v /F 0 -maximum efficiency of the water-splitting reaction of the donor side of PSII; F v /F m -maximum quantum yield of PS II; H -R/FR higher value of the red/far red ratio; L-R/FR -lower value of the red/far red ratio; PAR -photosynthetically active radiation; PI -PSII vitality index; PSII -photosystem II; Q A -plastochinon Q A ; RC -reaction center; RC/ABS -reaction center density ratio in terms of chlorophyll; R/FR -photon intensity between 660-670 nm/photon intensity between 725-735 nm; TR 0 /RC -energy trapping of one active reaction center; WBI -water band index. * Corresponding authors,

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Section: Table 2 the Values Of Chlorophyll A Fluorescence Parameterssupporting

confidence: 79%

A Low Ratio of Red/Far-Red in the Light Spectrum Accelerates Senescence in Nest Leaves of Platycerium Bifurcatum

Oliwa¹,

Kornaś²,

Skoczowski³

2017

Acta Biologica Cracoviensia S. Botanica

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“…This is caused by the lower efficiency of energy transfer in plants growing under conditions simulating high insolation. The relationships between the flow parameters in this study are consistent with those obtained by Castro et al (2011) and correspond to the assumptions proposed by Strasser et al (2000).…”

Section: Photosynthetic Efficiency Of Leavessupporting

confidence: 90%

Morphogenesis of sporotrophophyll leaves in Platycerium bifurcatum depends on the red/far-red ratio in the light spectrum

2016

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Although the fern Platycerium bifurcatum is popular among the producers of ornamental plants, it is a species of relatively poorly known physiology. Studies concerning the impact of the red/far-red (R/FR) ratio on photomorphogenesis refer primarily to spermatophytes. However, quite different phytochrome response mechanism functions in ferns, involving the localization of physiologically active form of phytochrome in the cytoplasm, without translocation to the nucleus. This work determined the reaction of young fern sporotrophophylls to the change of the R/FR ratio and investigated sporophyte ontogeny in various spectral light composition using nondestructive testing methods. It has been shown that the development of morphogenic sporophyte depends on the R/FR ratio. At a high R/FR ratio, sporotrophophylls showed a slower growth compared to those growing at a low value. A high R/FR value resulted in lower photochemical performance of PSII and adverse changes in the functioning of the acceptor portion of the PSII reaction center, while the PSII vitality analysis indicated the positive effect of simulated shadow. The value of the R/FR ratio did not affect the intensity of blue-green leaf fluorescence. However, the fluorescence intensity of red and far-red was significantly higher in plants growing at higher R/FR values. The analysis of leaf optical properties indicated higher concentrations of carotenoids and anthocyanins in the leaves of plants grown under the lower R/FR ratio. Determining the effect of spectral light composition on the physiology of this species may be useful for plant breeders and for the protection of these epiphytes in natural habitats.

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“…In the present study, a limiting factor in seedling growth was nitrogen deficiency, as indicated by the decrease in chlorophyll levels from 51 to 62 DAS, it was observed in all the treatments except 'Tainung 01' at 9.0 kPa STI. Castro et al (2011) reported that values under 20 SPAD units indicate senescence in papaya seedlings.…”

Section: Resultsmentioning

confidence: 99%

Papaya seedlings growth using a low-cost, automatic watering controller

Dias¹,

Médici

Vasconcellos

et al. 2013

Rev. Bras. Frutic.

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The study assessed growth and physiological parameters of 'Sunrise Golden' and 'Tainung 01' papaya seedlings grown in 280mL plastic tubes and watered using a low-cost automatic irrigation system adjusted to operate at substrate water tension for starting irrigation (STI) of 3.0, 6.0 or 9.0 kPa. The water depths applied by the dripping system and drainage were monitored during germination and seedling growth. Germination, emergence velocity index (EVI), leaf area, plant height, shoot and root dry weight, stomatal conductance, relative water content (RWC) and relative chlorophyll content (RCC) were evaluated. Soil nutrient levels were determined by electrical conductivity (EC). Water use efficiency (WUE) corresponded to the ratio of plant dry mass to depth of water applied. STI settings did not affect papaya germination or EVI. System configuration to 3.0 and 6.0 kPa STI exhibited the highest drainage and lowest EC and RCC, indicating soil nutrient loss and plant nutrient deficiency. Drainage was greater in tubes planted with the 'Tainung 01' variety, which developed smaller root systems and lower stomatal conductance than 'Sunrise Golden' seedlings. The highest values for shoot dry weight and WEU were obtained at 6.0 kPa STI for 'Sunrise Golden' (0.62 g and 0.69 g L-1) and at 9.0 kPa in 'Tainung 01' (0.35 g and 0.82 g L-1). RWC at 9.0 kPa STI was lower than at 3.0 kPa in both varieties. The results indicate that the low-cost technology developed for irrigation automation is promising. Even so, new studies are needed to evaluate low-flow irrigation systems as well as the nutrient and water needs of different papaya varieties.

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Relationship between photochemical efficiency (JIP-Test Parameters) and portable chlorophyll meter readings in papaya plants

Cited by 20 publications

References 21 publications

A Low Ratio of Red/Far-Red in the Light Spectrum Accelerates Senescence in Nest Leaves of Platycerium Bifurcatum

A Low Ratio of Red/Far-Red in the Light Spectrum Accelerates Senescence in Nest Leaves of Platycerium Bifurcatum

Morphogenesis of sporotrophophyll leaves in Platycerium bifurcatum depends on the red/far-red ratio in the light spectrum

Papaya seedlings growth using a low-cost, automatic watering controller

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