Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 166, Issue 17, Pages 1878-1891Publisher
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2009.05.016
Keywords
Drought stress; Glutathione transferase; Grain filling; Wheat
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Funding
- National RD Program NKFP [4/06/2004]
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Total glutathione S-transferase (GST, EC 2.5.1.18) and glutathione peroxidase (GPOX) activity were measured spectrophotometrically in Triticum aestivum cv. MV Emese and cv. Plainsman (drought tolerant) and cv. GK Elet and Cappelle Desprez (drought-sensitive) flag leaves under control and drought stress conditions during the grain-filling period, in order to reveal possible rotes of different GST classes in the senescence of flag leaves. Six wheat GSTs, members of 3 GST classes, were selected and their regulation by drought and senescence was investigated. High GPOX activity (EC 1.11.1.9) was observed in well-watered controls of the drought-tolerant Plainsman cultivar. At the same time, TaGSTU1B and TaGSTF6 sequences, investigated by real-time PCR, showed high-expression levels that increased with time, indicating that the gene products of these genes may play important roles in monocarpic senescence of wheat. Expression of these genes was also induced by drought stress in all of the four investigated cultivars, but extremely high transcript amounts were detected in cv. Plainsman. Our data indicate genotypic variations of wheat GSTs. Expression levels and early induction of two senescence-associated GSTs under drought during grain fitting in flag leaves correlated with high yield stability. (C) 2009 Elsevier GmbH. All rights reserved.
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