Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Unraveling Morphophysiological and Biochemical Responses of Triticum aestivum L. to Extreme pH: Coordinated Actions of Antioxidant Defense and Glyoxalase Systems

MHM Borhannuddin Bhuyan
ORCID logo ,
Mirza Hasanuzzaman
,
Jubater Al Mahmud
,
Md. Shahadat Hossain
,
Tasnim Farha Bhuiyan
,
Masayuki Fujita
*
Version 1 : Received: 13 January 2019 / Approved: 15 January 2019 / Online: 15 January 2019 (07:37:11 CET)

A peer-reviewed article of this Preprint also exists.

Bhuyan, M.H.M.B.; Hasanuzzaman, M.; Mahmud, J.A.; Hossain, M.S.; Bhuiyan, T.F.; Fujita, M. Unraveling Morphophysiological and Biochemical Responses of Triticum aestivum L. to Extreme pH: Coordinated Actions of Antioxidant Defense and Glyoxalase Systems. Plants 2019, 8, 24. Bhuyan, M.H.M.B.; Hasanuzzaman, M.; Mahmud, J.A.; Hossain, M.S.; Bhuiyan, T.F.; Fujita, M. Unraveling Morphophysiological and Biochemical Responses of Triticum aestivum L. to Extreme pH: Coordinated Actions of Antioxidant Defense and Glyoxalase Systems. Plants 2019, 8, 24.

Abstract

Soil pH, either low (acidity) or high (alkalinity) is one of the major constraints that affect many biochemical and biological processes within the cell. The present study was carried out to understand the oxidative damage and antioxidant defense in wheat (Triticum aestivum L. cv. BARI Gom-25) grown under different pH regimes. Eight-day-old seedlings were exposed to growing media with different pH levels (4.0, 5.5, 7.0 and 8.5). Seedlings grown in pH 4.0 and in pH 8.5 showed reductions in biomass, water, and chlorophyll contents; whereas plants grown at pH 7.0 (neutral) exhibited better performance. Extremely acidic (pH 4.0) and/or strongly alkaline (pH 8.5)-stress also increased oxidative damages in wheat by excess reactive oxygen species (ROS) generation and methylglyoxal (MG) production, which increased lipid peroxidation and disrupted the redox state. In contrary, the lowest oxidative damage was observed at neutral condition followed by strong acidic condition (pH 5.5), which was attributed mainly due to better performance of the antioxidant defense and glyoxalase systems. Interestingly, seedlings grown at pH 5.5 showed a significant increase in morphophysiological attributes compared with extreme acidic (pH 4.0)- and strong alkaline (pH 8.5)-stress treatments, which indicates the tolerance of wheat to the acidic condition.

Keywords

acidity; alkalinity; antioxidant defense; methylglyoxal; phytotoxicity; reactive oxygen species

Subject

Biology and Life Sciences, Agricultural Science and Agronomy

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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