Impact of Drought, Heat, and Their Combination on Chlorophyll Fluorescence and Yield of Wild Barley (Hordeum spontaneum)
By Christoph Jedmowski, A. Ashoub, O. Momtaz, W. Brüggemann. 2015
89 citations recorded by the source corpus.
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 (), 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 () and of the relative amplitude of the IP-phase of the OJIP induction curve (). 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.
Subfields: Molecular Biology, Plant Science
View Paper: https://www.semanticscholar.org/paper/204acad685c393c1076314187d07b7ab072bda23
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Citations in the corpus
- Chlorophyll a fluorescence induction: Can just a one-second measurement be used to quantify abiotic stress responses? (2018, background): “Although in some cases the PI values were shown to correlate with data related to CO2 assimilation or even growth (e.g., Strasser et al. 2007, Zubek et al. 2009), several other results confirm that PIs cannot reliably evaluate these processes (e.g., Yusuf et al. 2010, Jedmowski et al. 2015).”
- Impact of Combined Abiotic and Biotic Stresses on Plant Growth and Avenues for Crop Improvement by Exploiting Physio-morphological Traits (2017, background): “Simultaneously occurring drought and heat stress stands as the most evident stress combination (Prasad et al., 2011; Jedmowski et al., 2015).”
- Potassium: A Vital Regulator of Plant Responses and Tolerance to Abiotic Stresses (2018, background): “The combination of different stresses that affect crops has become more common; for example, the occurrence of drought and high temperature is the most common [4], while in arid and semi-arid regions, salinity and high temperature stresses are imposed at the same time.”