Characteristic changes can be observed in the physiology of plants during drought stress: water-loss is reduced due to the closure of stomata, root growth and later shoot growth are reduced, photosynthetic processes are inhibited - among other physiological changes. 22 barley (Hordeum vulgare L.) varieties were tested in order to investigate the physiological effects of drought stress. Measurements were performed on nine-day old seedlings using PAM chlorophyll fluorescence imaging in four replicates. Drought stress was induced by 20% PEG (polyethylene glycol) 6000 solution and 16 hours of drying. The maximum quantum yield (Fv/Fm), the yield (Y) and the non-photochemical quenching (NPQ) were measured after the drought stress. All three parameters were significantly reduced in response to drought conditions: the maximum quantum yield decreased by 16%, the yield decreased by 8% and the non-photochemical quenching decreased by 94%. Based on these results the investigated parameters could be good indicators of drought tolerance of barley genotypes, even in the early stages of their development.
ASJC Scopus subject areas
- Plant Science
- Ecology, Evolution, Behavior and Systematics