2008 Joint Annual Meeting (5-9 Oct. 2008): The Effect of Abscisic Acid on Stomatal Gases Exchange in Six Barley Genotypes under Water Stress.
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721-1 The Effect of Abscisic Acid on Stomatal Gases Exchange in Six Barley Genotypes under Water Stress.



Wednesday, 8 October 2008
George R. Brown Convention Center, Exhibit Hall E
Vaclav Hejnak1, Ivana Safrankova2, Milan Skalicky1 and Zdislava Ernestova3, (1)Department of Botany and Plant Physiology, Czech University of Life Sciences Prague, Kamycka 129, Prague 6 - Suchdol, 165 21, Czech Republic
(2)Department of Biology, University of Hradec Kralove, Rokitanskeho 62, Hradec Kralove, 500 03, Czech Republic
(3)Personnel Division, Ministry of Defence Czech Republic, Namesti Svobody 471, Prague 6, 160 00, Czech Republic
The spring barley plants were grown in a physiological greenhouse in pots under controlled conditions. For six genotypes evaluated from various climatic areas mild water stress resulted in reduced gas exchange parameters – rate of photosynthesis (PN) and rate of transpiration (E). For all (except the Mexican Namoi) there was a fall in the water use efficiency (WUE = PN/E). The largest fall was recorded for the French genotype Adagio. From the standpoint of WUE the Adagio was the most sensitive variety to a mild water stress, in contrast the Namoi was the least sensitive variety. Treating the plants with abscisic acid under a mild water stress resulted in all genotypes showing further, statistically significant reductions in PN (except for the wild W 154) and E in comparison with untreated plants. ABA under mild water stress supported the plant’s water conservation and in a number of cases also improved the WUE (for the Czech genotype Maridol, the English Braemar, the French Adagio, the Israeli wild W 154 and partially in the Yugoslavian Novosadski).

Acknowledgements
This work was prepared with the support of Ministry of Education, Youth and Sports grant no. MSM 6046070901.

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