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Conventional and combinatorial chlorophyll fluorescence imaging of tobamovirus-infected plants

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Photosynthetica

Abstract

We compared by chlorophyll (Chl) fluorescence imaging the effects of two strains of the same virus (Italian and Spanish strains of the Pepper mild mottle virus — PMMoV-I and-S, respectively) in the host plant Nicotiana benthamiana. The infection was visualized either using conventional Chl fluorescence parameters or by an advanced statistical approach, yielding a combinatorial set of images that enhances the contrast between control and PMMoV-infected plants in the early infection steps. Among the conventional Chl fluorescence parameters, the non-photochemical quenching parameter NPQ was found to be an effective PMMoV infection reporter in asymptomatic leaves of N. benthamiana, detecting an intermediate infection phase. The combinatorial imaging revealed the infection earlier than any of the standard Chl fluorescence parameters, detecting the PMMoV-S infection as soon as 4 d post-inoculation (dpi), and PMMoV-I infection at 6 dpi; the delay correlates with the lower virulence of the last viral strain.

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Abbreviations

AS:

asymptomatic

CCD:

charge-coupled device

Chl:

chlorophyll

Chl-F:

chlorophyll fluorescence

Chl-FI:

chlorophyll fluorescence imaging

dpi:

days post-inoculation

F0 :

minimum chlorophyll fluorescence in the dark adapted state

FM :

maximum chlorophyll fluorescence in the dark adapted state

FM’:

maximum chlorophyll fluorescence in the light adapted state

FM’’:

maximum chlorophyll fluorescence after switching off the “actinic light” (protocol 2)

FP :

maximum chlorophyll fluorescence reached at the induction curve without saturating flashes

Ft :

chlorophyll fluorescence value prior to the saturating pulse in the light-adapted state

FV :

variable fluorescence

HI:

high irradiance

LDA:

Linear Discriminant Analysis

LED:

light-emitting diode

LI:

low irradiance

PAR:

photosynthetically active radiation

NPQ:

non-photochemical quenching

NPQt :

non-photochemical quenching at referred kinetics times, t

P N :

net photosynthetic rate

PMMoV-I and-S:

Italian and Spanish strains of the Pepper mild mottle virus

PS:

photosystem

R:

image resulting from the combinatorial imaging

Re:

recovered

S:

symptomatic

SFFS:

Sequential Forward Floating Search

ΦPS2 :

photosystem 2 quantum yield

ΦPS2-t :

photosystem 2 quantum yield at referred kinetics times, t [s]

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Correspondence to M. Barón.

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Pineda, M., Soukupová, J., Matouš, K. et al. Conventional and combinatorial chlorophyll fluorescence imaging of tobamovirus-infected plants. Photosynthetica 46, 441–451 (2008). https://doi.org/10.1007/s11099-008-0076-y

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  • DOI: https://doi.org/10.1007/s11099-008-0076-y

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