Physiological and morphological responses to water stress in Aegilops biuncialis and Triticum aestivum genotypes with differing tolerance to drought

Functional Plant Biology : FPB
István MolnárGábor Galiba

Abstract

The physiological and morphological responses to water stress induced by polyethylene glycol (PEG) or by withholding water were investigated in Aegilops biuncialis Vis. genotypes differing in the annual rainfall of their habitat (1050, 550 and 225 mm year-1) and in Triticum aestivum L. wheat genotypes differing in drought tolerance. A decrease in the osmotic pressure of the nutrient solution from -0.027 to -1.8 MPa resulted in significant water loss, a low degree of stomatal closure and a decrease in the intercellular CO2 concentration (Ci) in Aegilops genotypes originating from dry habitats, while in wheat genotypes high osmotic stress increased stomatal closure, resulting in a low level of water loss and high Ci. Nevertheless, under saturating light at normal atmospheric CO2 levels, the rate of CO2 assimilation was higher for the Aegilops accessions, under high osmotic stress, than for the wheat genotypes. Moreover, in the wheat genotypes CO2 assimilation exhibited less or no O2 sensitivity. These physiological responses were manifested in changes in the growth rate and biomass production, since Aegilops (Ae550, Ae225) genotypes retained a higher growth rate (especially in the roots), biomass production and yield formation af...Continue Reading

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Citations

May 16, 2006·Genome Génome / Conseil National De Recherches Canada·Ervin D NagyMárta Molnár-Láng
Apr 3, 2013·Genetics and Molecular Research : GMR·J WangJ M Li
Oct 22, 2016·Frontiers in Plant Science·Szabolcs MakaiAngéla Juhász
Oct 13, 2017·Cell Biology International·Anastasiia RabokonYaroslav Blume
Dec 30, 2017·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Juan B Alvarez, Carlos Guzmán
Apr 1, 2009·Functional Plant Biology : FPB·Zsolt ZsófiSándor Dulai
Jan 5, 2006·Genome Génome / Conseil National De Recherches Canada·Annamária SchneiderMárta Molnár-Láng
Feb 1, 2012·Functional Plant Biology : FPB·Gautam P PradhanBikram S Gill
Apr 1, 2007·Functional Plant Biology : FPB·Juan Jose Olivares-VillegasGlenn K McDonald
Apr 8, 2014·Genome Génome / Conseil National De Recherches Canada·András FarkasMárta Molnár-Láng
Jul 27, 2017·Frontiers in Plant Science·Simone LandiSergio Esposito
Jul 13, 2016·The Plant Journal : for Cell and Molecular Biology·István MolnárJaroslav Doležel

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