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• W1980335280 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, ΔVIP = −VI = (FM−FI)/(FM− Fo), 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 O2-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." @default.
• W1980335280 created "2016-06-24" @default.
• W1980335280 creator A5006258992 @default.
• W1980335280 creator A5047253736 @default.
• W1980335280 creator A5088331038 @default.
• W1980335280 date "2009-10-01" @default.
• W1980335280 modified "2023-10-03" @default.
• W1980335280 title "Drought stress effects on photosystem I content and photosystem II thermotolerance analyzed using Chl<i>a</i>fluorescence kinetics in barley varieties differing in their drought tolerance" @default.
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• W1980335280 doi "https://doi.org/10.1111/j.1399-3054.2009.01273.x" @default.
• W1980335280 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19719481" @default.
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