Acta Agronomica Hungarica
Volume/Issue:
Volume 57: Issue 4
Analysis of heat stress tolerance in winter wheat
Authors:
K. Balla Agricultural Research Institute of the Hungarian Academy of Sciences Martonvásár Hungary

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,
S. Bencze Agricultural Research Institute of the Hungarian Academy of Sciences Martonvásár Hungary

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,
T. Janda Agricultural Research Institute of the Hungarian Academy of Sciences Martonvásár Hungary

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, and
O. Veisz Agricultural Research Institute of the Hungarian Academy of Sciences Martonvásár Hungary

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Pages:
437–444
Online Publication Date:
21 Nov 2009
Publication Date:
01 Dec 2009
Article Category:
Research Article
DOI:
https://doi.org/10.1556/AAgr.57.2009.4.6
Keywords:
heat stress; yield; chlorophyll content; antioxidant enzyme activity
Restricted access

As a consequence of climate change, the incidence of extreme weather events has increased in Hungary, as elsewhere. Extremely high temperatures are the factor causing the greatest problems for agriculture and crop production. The aim was to determine the heat tolerance of two wheat varieties (Plainsman V. and Mv Magma) by measuring physiological and yield parameters under high temperature conditions (35/20°C day/night) in the phytotron. Heat stress had a substantial influence on the chlorophyll content, antioxidant enzyme activity and yield parameters of the two winter wheat varieties. Heat stress during grain filling led to a significant reduction in the yield, biomass, grain number, harvest index and thousand-kernel weight. Significant differences could be detected between the two varieties, confirming the greater heat sensitivity of Plainsman V. and the better heat tolerance of Mv Magma. The importance of the antioxidant enzyme system was demonstrated in defence against heat stress. The activity of the enzymes glutathione-Stransferase (GSH-S-Tr), ascorbate peroxidase (APx) and catalase (CAT) was enhanced in Plainsman V., and that of GSH-S-Tr and CAT in Mv Magma. The tolerance of the wheat varieties appeared to be correlated with the antioxidant level, though changes in activity were observed for different antioxidant enzymes in the two genotypes tested.

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Cover Acta Agronomica Hungarica
Acta Agronomica Hungarica
Print ISSN:
0238-0161
Online ISSN:
1588-2527

Acta Agronomica Hungarica
Language English
Russian
German
French
Size  
Year of
Foundation		 1950
Publication
Programme		 ceased
Volumes
per Year		  
Issues
per Year		  
Founder Magyar Tudományos Akadémia   
Founder's
Address		 H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0238-0161 (Print)
ISSN 1588-2527 (Online)

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