Abstract
Polyphasic chlorophyll α fluorescence represents a promising tool for detection of plant tolerance to various environmental stresses. In pot vegetation experiments, plants of seven winter wheat varieties were screened for their drought tolerance. The drought stress was initiated in plants by withholding water at the beginning of anthesis. While water content was measured continuously as relative water content (RWC), fast chlorophyll α fluorescence kinetics was measured and analysed on dehydrating intact leaves by the JIP-test (analysis of O-J-I-P fluorescence transient). Maximum quantum efficiency of PS II photochemistry (FV/FM) parameter was almost unaffected by dehydration until the severe water stress occurred. In contrast to this a continuous decrease of performance index (PIabs) parameter (Strasser et al. 1995) was observed from the very beginning of dehydration following the decrease of RWC. Statistically significant differences were also found in the PIabs parameter among all tested varieties. The results show that PIabs may serve as an index of plant/variety vitality and/or sensitivity to water stress reflecting their different drought tolerance.
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Claims 4
Claim · model-written summary
Maximum PS II quantum efficiency was almost unchanged by dehydration until severe water stress.
- Taxon
- Triticum aestivum L.
Triticum aestivumt0 - Treatment
- dehydratione0
- Outcome
- Maximum quantum efficiency of PS II photochemistry (FV/FM)e0
- Direction
- almost unaffectede0
- Qualifier
- until the severe water stress occurrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum quantum efficiency of PS II photochemistry (FV/FM) parameter was almost unaffected by dehydration until the severe water stress occurred.”
t0“Triticum aestivum L.”
Claim · model-written summary
Performance index decreased continuously from the start of dehydration as relative water content fell.
- Treatment
- dehydratione0
- Outcome
- performance index (PIabs)e0
- Direction
- decreasee0
- Qualifier
- following the decrease of RWCe0
Not reportedTaxon
Verbatim
e0“a continuous decrease of performance index (PIabs) parameter (Strasser et al. 1995) was observed from the very beginning of dehydration following the decrease of RWC.”
Claim · model-written summary
Performance index differed significantly among all tested wheat varieties.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Material
- tested varietiese0
- Outcome
- PIabs parametere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistically significant differences were also found in the PIabs parameter among all tested varieties.”
t0“Triticum aestivum L.”
Claim · model-written summary
The authors propose PIabs as an index of wheat vitality and sensitivity to water stress.
Not reportedTaxonComparatorValue
Verbatim
e0“The results show that PIabs may serve as an index of plant/variety vitality and/or sensitivity to water stress reflecting their different drought tolerance.”
The same questions in other papers
drought · physiology: photosynthesis · Triticum aestivum (wheat)Positive and negative results
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