Abstract
The impact of (long-term) drought acclimation and (short-term) heat stress and their combination on fast chlorophyll fluorescence induction curves (OJIP) and grain yield was tested using pot-grown plants of wild barley ( Hordeum spontaneum ) originating from Northern Egypt. Concerning agronomic traits, the main effect of drought was decreased biomass accumulation and grain yield, while heat specifically affected floral development. The treatments caused specific inhibitions of photosystem II (PSII) functionality. While heat stressed plants showed a reduction of maximum quantum efficiency of PSII (φP0), an indication of effects on oxygen evolving complex (OEC) functionality, and the connectivity of PSII units, these features were entirely missing in drought acclimated plants. Drought caused a reduction of the Performance Index (PIabs) and of the relative amplitude of the IP-phase of the OJIP induction curve (ΔVIP). Individuals suffering from a combination of drought and heat showed a better ability to recover photosynthetic electron transport after the relief of stress in comparison to heat stressed plants. However, this improved capacity to recover was not accompanied by an increased grain yield. Thus, we conclude that chlorophyll fluorescence measurements provide valuable physiological data; however, their use in agronomic studies for the prediction of agronomic traits should be done with some precaution.
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Claims 9
Claim · model-written summary
Drought decreased biomass accumulation and grain yield in wild barley.
- Taxon
- Wild Barley (Hordeum spontaneum)
.jpg?width=60)
Hordeum vulgare subsp. spontaneumt0 - Treatment
- droughte0
- Outcome
- biomass accumulation and grain yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“the main effect of drought was decreased biomass accumulation and grain yield”
t0“Wild Barley (Hordeum spontaneum)”
Claim · model-written summary
Heat affected floral development in wild barley.
- Taxon
- Wild Barley (Hordeum spontaneum)Hordeum vulgare subsp. spontaneumt0
- Treatment
- heate0
- Outcome
- floral developmente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat specifically affected floral development”
t0“Wild Barley (Hordeum spontaneum)”
Claim · model-written summary
Heat reduced maximum quantum efficiency of PSII in wild barley.
- Taxon
- Wild Barley (Hordeum spontaneum)Hordeum vulgare subsp. spontaneumt0
- Treatment
- heate0
- Outcome
- maximum quantum efficiency of PSII (φP0)e0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat stressed plants showed a reduction of maximum quantum efficiency of PSII (φP0)”
t0“Wild Barley (Hordeum spontaneum)”
Claim · model-written summary
Heat affected oxygen evolving complex functionality in wild barley.
- Taxon
- Wild Barley (Hordeum spontaneum)Hordeum vulgare subsp. spontaneumt0
- Outcome
- oxygen evolving complex (OEC) functionalitye0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an indication of effects on oxygen evolving complex (OEC) functionality”
t0“Wild Barley (Hordeum spontaneum)”
Claim · model-written summary
Heat reduced connectivity of PSII units in wild barley.
- Taxon
- Wild Barley (Hordeum spontaneum)Hordeum vulgare subsp. spontaneumt0
- Outcome
- connectivity of PSII unitse0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and the connectivity of PSII units, these features were entirely missing in drought acclimated plants.”
t0“Wild Barley (Hordeum spontaneum)”
Claim · model-written summary
Drought reduced the Performance Index and the relative IP-phase amplitude in wild barley.
- Taxon
- Wild Barley (Hordeum spontaneum)Hordeum vulgare subsp. spontaneumt0
- Treatment
- Droughte0
- Outcome
- Performance Index (PIabs) and of the relative amplitude of the IP-phase of the OJIP induction curve (ΔVIP)e0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought caused a reduction of the Performance Index (PIabs) and of the relative amplitude of the IP-phase of the OJIP induction curve (ΔVIP).”
t0“Wild Barley (Hordeum spontaneum)”
Claim · model-written summary
After stress relief, combined drought and heat improved recovery of photosynthetic electron transport relative to heat alone.
- Taxon
- Wild Barley (Hordeum spontaneum)Hordeum vulgare subsp. spontaneumt0
- Treatment
- a combination of drought and heate0
- Outcome
- recover photosynthetic electron transporte0
- Direction
- bettere0
- Comparator
- heat stressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Individuals suffering from a combination of drought and heat showed a better ability to recover photosynthetic electron transport after the relief of stress in comparison to heat stressed plants.”
t0“Wild Barley (Hordeum spontaneum)”
Claim · model-written summary
Improved recovery after combined drought and heat did not raise grain yield.
- Taxon
- Wild Barley (Hordeum spontaneum)Hordeum vulgare subsp. spontaneumt0
- Outcome
- grain yielde0
- Direction
- not accompanied by an increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this improved capacity to recover was not accompanied by an increased grain yield.”
t0“Wild Barley (Hordeum spontaneum)”
Claim · model-written summary
The authors advise caution in using chlorophyll fluorescence to predict agronomic traits.
- Taxon
- Wild Barley (Hordeum spontaneum)Hordeum vulgare subsp. spontaneumt0
- Outcome
- use in agronomic studies for the prediction of agronomic traits should be done with some precautione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their use in agronomic studies for the prediction of agronomic traits should be done with some precaution.”
t0“Wild Barley (Hordeum spontaneum)”
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