The DOI matches its Crossref record; 54 of the 54 references it cites were found in a registry or an index.
Drought stress effects on photosystem I content and photosystem II thermotolerance analyzed using Chl a fluorescence kinetics in barley varieties differing in their drought tolerance
Abstract
Drought stress has multiple effects on the photosynthetic system. Here, we show that a decrease of the relative contribution of the I‐P phase, ΔV IP= −VI= (FM−FI)/(F M− F o), to the fluorescence transient OJIP is observed in 10 drought‐stressed barley and 9 chickpea varieties. The extent of the I‐P loss in the barley varieties depended on their drought tolerance. The relative loss of the I‐P phase seems to be related to a loss of photosystem (PS) I reaction centers as determined by 820‐nm transmission measurements. In the second part of this study, the interaction of drought and heat stress in two barley varieties (the drought tolerant variety A¨t Baha and the drought sensitive variety Lannaceur) was studied using a new approach. Heat stress was induced by exposing the plant leaves to temperatures of 25–45°C and the inactivation of the O 2‐evolving complex (OEC) was followed measuring chlorophyll a(Chl a) fluorescence using a protocol consisting of two 5‐ms pulses spaced 2.3 ms apart. In active reaction centers, the dark interval is long enough to allow the OEC to recover from the first pulse; whereas in heat‐inactivated reaction centers it is not. In the latter category of reaction centers, no further fluorescence rise is induced by the second pulse. Lannaceur, under well‐watered conditions, was more heat tolerant than Aït Baha. However, this difference was lost following drought stress. Drought stress considerably increased the thermostability of PS II of both varieties.
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New phenotyping methods for screening wheat and barley for beneficial responses to water deficit
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Metadata
- Authors
- Oukarroum, A., Schansker, G., & Strasser, R. J.
- Venue
- Physiologia Plantarum
- Publisher
- Wiley
- Published
- 2009-09-09
- Volume
- 137
- Issue
- 2
- Pages
- 188-199
- ISSN
- 0031-9317 (ISSN-L)
- 1399-3054
- OpenAlex
- W1980335280
- Cited by
- 292
- References
- 54
- FWCI
- 4.68
- Type
- journal article
- Language
- en
- Open access
- closed
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- Oukarroum, A., Schansker, G., & Strasser, R. J. (2009). Drought stress effects on photosystem I content and photosystem II thermotolerance analyzed using Chl a fluorescence kinetics in barley varieties differing in their drought tolerance. Physiologia Plantarum. https://doi.org/10.1111/j.1399-3054.2009.01273.x
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