Drought tolerance in cereals in terms of water retention,photosynthesis and antioxidant enzyme activities |
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Authors: | Szilvia Bencze Zsuzsanna Bamberger Tibor Janda Krisztina Balla Zoltán Bedő Ottó Veisz |
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Institution: | 1.Agricultural Research Institute of the Hungarian Academy of Sciences,Martonvásár,Hungary |
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Abstract: | Experiments were carried out on three bread wheat varieties, one barley and one durum wheat variety grown in pots in the phytotron
and subjected to water withdrawal for 7 days during grain-filling. Leaf water loss, net assimilation rate and transpiration
showed marked differences, allowing the genotypes to be ranked. Although the most resistant variety had the highest activity
for ascorbate peroxidase (APX), catalase (CAT), glutathione reductase (GR) and glutathione-S-transferase (GST), which did
not rise further in response to drought and the most susceptible variety had the lowest values, which increased to the greatest
extent under drought, the level of sensitivity could not be predicted for all the genotypes from the enzyme activity values
alone. The largest increases were recorded for the APX, CAT and GR activities. In most genotypes the GR activity was correlated
with that of GST, CAT and APX. Changes in the enzyme activities were observed after a decline in transpiration and photosynthesis.
The range of soil moisture values over which the antioxidant enzyme activity levels remained relatively unchanged was a better
indication of tolerance to drought than either basic or stress-induced activity levels. |
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Keywords: | |
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