Abstract
The present work focused on the characterization of some physiological mechanisms activated upon powdery mildew inoculation of the susceptible barley cultivar Ingrid and its near-isogenic lines (NILs) carrying various resistant genes (Mla, Mlg and mlo). After inoculation with Blumeria graminis f. sp. hordei (Bgh), measurements of leaf reflectance and chlorophyll a fluorescence were performed 3 and 7 day post-inoculation (dpi), while hormone assays were made 7 dpi. Bgh-inoculated resistant genotypes were characterized by lowered leaf reflectance parameters that correlated with carotenoids (CRI) and water content (WBI) in comparison to inoculated Ingrid. The PSII activity (i.e., Fv/Fm, ETo/CSm and P.I.ABS) strongly decreased in susceptible Ingrid leaves when the disease symptoms became visible 7 dpi. In Mla plants with visible hypersensitive spots the PSII activity decreased to a lesser extent. Inoculation resulted in a very slight decrease of photosynthesis at later stage of infection in Mlg plants, whereas in resistant mlo plants the PSII activity did not change. Chlorophyll a fluorescence measurements allowed presymptomatic detection of infection in Ingrid and Mla. Changes in the homeostasis of 22 phytohormones (cytokinins, auxins, gibberellins and the stress hormones JA, SA and ABA) in powdery mildew inoculated barley are discussed in relation to resistance against this biotrophic pathogen.
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Claims 6
Claim · model-written summary
Inoculated resistant lines had lower reflectance parameters related to carotenoids and water content than Ingrid.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Material
- resistant genotypese0
- Treatment
- Bgh-inoculatede0
- Interactor
- Bghe0pathogen
- Outcome
- leaf reflectance parameterse0
- Direction
- lowerede0
- Comparator
- inoculated Ingride0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Bgh-inoculated resistant genotypes were characterized by lowered leaf reflectance parameters that correlated with carotenoids (CRI) and water content (WBI) in comparison to inoculated Ingrid”
t0“Barley”
Claim · model-written summary
PSII activity strongly decreased in susceptible Ingrid after symptoms appeared at 7 dpi.
- Taxon
- barleyHordeum vulgaret0
- Material
- Ingride0
- Organ / stage
- leavese0
- Outcome
- PSII activitye0
- Direction
- strongly decreasede0
- Qualifier
- 7 dpie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PSII activity (i.e., Fv/Fm, ETo/CSm and P.I.ABS) strongly decreased in susceptible Ingrid leaves when the disease symptoms became visible 7 dpi”
t0“Barley”
Claim · model-written summary
PSII activity decreased less in Mla plants with hypersensitive spots.
- Taxon
- barleyHordeum vulgaret0
- Material
- Mlae0
- Outcome
- PSII activitye0
- Direction
- decreasede0
- Qualifier
- visible hypersensitive spotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Mla plants with visible hypersensitive spots the PSII activity decreased to a lesser extent”
t0“Barley”
Claim · model-written summary
Inoculation caused a very slight late decrease in photosynthesis in Mlg plants.
- Taxon
- barleyHordeum vulgaret0
- Material
- Mlge0
- Treatment
- Inoculatione0
- Outcome
- photosynthesise0
- Direction
- decreasee0
- Qualifier
- at later stage of infectione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation resulted in a very slight decrease of photosynthesis at later stage of infection in Mlg plants”
t0“Barley”
Claim · model-written summary
PSII activity did not change in resistant mlo plants.
- Taxon
- barleyHordeum vulgaret0
- Material
- mloe0
- Outcome
- PSII activitye0
- Direction
- did not changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in resistant mlo plants the PSII activity did not change”
t0“Barley”
Claim · model-written summary
Chlorophyll fluorescence enabled presymptomatic detection of infection in Ingrid and Mla.
- Taxon
- barleyHordeum vulgaret0
- Material
- Ingrid and Mlae0
- Outcome
- presymptomatic detection of infectione0
- Qualifier
- Chlorophyll a fluorescence measurementse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll a fluorescence measurements allowed presymptomatic detection of infection in Ingrid and Mla”
t0“Barley”
The same questions in other papers
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