Effect of water stress on carbon dioxide exchange in flag leaves of spring wheat triticum aestivum var lutescens cultivar kolibri

Zagdanska, B.

Acta Physiologiae Plantarum 6(4): 215-222


ISSN/ISBN: 0137-5881
Accession: 005282734

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Water stress-induced changes in the net photosynthesis and dark respiration rates were studied in the flag leaves of spring wheat which were or were not subjected to hardening treatment (i.e., exposed to water deficiency during flag leaf differentiation). As a result of water stress, the inhibition of photosynthetic CO2 uptake was observed in the non-hardened leaves. The hardened leaves showed a smaller response to the stress. Dark respiration rate in the non-hardened leaf was insignificantly affected by water stress. Hardening treatment enhanced the CO2 evolution in the dark. The restriction of photosynthesis under water stress conditions was only partially due to the increase of leaf resistance to gas flow.