Relationship between osmotic stress-induced abscisic acid accumulation, biomass production and plant growth in drought-tolerant and -sensitive wheat cultivars

Guoth, Adrienn and Benyo, Daniel and Csiszar, Jolan and Galle, Agnes and Horvath, Ferenc and Cseuz, Laszlo and Erdei, Laszlo and Tari, Irma (2010) Relationship between osmotic stress-induced abscisic acid accumulation, biomass production and plant growth in drought-tolerant and -sensitive wheat cultivars. Acta Physiologiae Plantarum, 32 (4). pp. 719-727. ISSN 0137-5881

Abstract

The effects of increasing osmotic stress induced by 100-400 mOsm (-0. 976 MPa) polyethylene glycol (PEG 6000) were investigated in a drought-tolerant (Triticum aestivum L. cv. Mv Emese) and drought-sensitive (cv. GK Élet) wheat cultivar at the three-leaf stage. During osmotic stress, the decline of the water potential (ψw) was more significant in the leaves, while the abscisic acid (ABA) levels of the roots increased earlier and remained higher in the sensitive than in the tolerant variety. There was an increasing gradient of ABA content toward the youngest leaves in the drought-sensitive GK Élet, while more ABA accumulated in the fully developed, older leaves of the tolerant cultivar Mv Emese. In accordance with the rapid and significant accumulation of ABA, the stomatal conductance decreased earlier in the tolerant cultivar. The effect of water stress on the PSII photochemistry was pronounced only 1 week after the exposure to PEG, as indicated by the earlier decrease of the net CO2 fixation, the effective quantum yield (ΦPSII) and the photochemical quenching (qP) in light-adapted samples of the tolerant variety in 400 mOsm PEG 6000. The stress treatment caused more significant reductions in these parameters toward the end of the experiment in the sensitive cultivar. In spite of small differences in the photosynthetic characteristics, the net biomass production was not significantly altered by this osmotic stress. The accumulation of ABA controlled the distribution of the biomass between the shoot and root systems under osmotic stress, and contributed to the development of stronger and deeper roots in the drought-sensitive cultivar GK Élet. However, the root elongation did not correlate with the drought sensitivity of these cultivars on the basis of crop yield.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 02 Jun 2011 11:29
Last Modified: 20 Oct 2014 04:00
Uncontrolled Keywords: abscisic acid contents; biomass distribution; osmotic stress; photosynthetic characteristics; wheat cultivars
Fields of Research (FOR2008): 06 Biological Sciences > 0607 Plant Biology > 060702 Plant Cell and Molecular Biology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070303 Crop and Pasture Biochemistry and Physiology
10 Technology > 1001 Agricultural Biotechnology > 100101 Agricultural Biotechnology Diagnostics (incl. Biosensors)
Socio-Economic Objective (SEO2008): B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Identification Number or DOI: doi: 10.1007/s11738-009-0453-6
URI: http://eprints.usq.edu.au/id/eprint/19134

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