Metabolic indicators of drought stress tolerance in wheat: Glutamine synthetase isoenzymes and Rubisco

Z. Nagy, Edit Németh, Adrienn Guóth, Lajos Bona, Barnabás Wodala, Attila Pécsváradi

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Drought stress has a considerable impact on the ecosystem and agriculture. Continuous water deficit induces early leaf senescence in plants. During this process, chloroplasts are degraded and photosynthesis drastically drops. The objective of this investigation was to look into the regulation of nitrogen and carbon metabolism during water deficit. Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase; EC 4.1.1.39) and the total protein contents inform us of the sink-source relation in plants. Glutamine synthetase (GS, EC 6.3.1.2) isoenzymes are good markers of plastid status (GS2) and the nitrogen metabolism (GS1).Tolerant and sensitive wheat (Triticum aestivum L.) genotypes were tested, which are widely used in agriculture. The amount of protein, Rubisco and GS isoforms in leaves were measured during the grain filling period, as indicative traits that ultimately determine the onset and stage of senescence. The symptoms of senescence first appeared on the oldest and finally on the youngest leaves. Drought stress disrupted the sequentiality of senescence in the sensitive varieties. An untimely senescence appeared in flag leaves, earlier than in the older leaves. Total protein and Rubisco contents decreased and the GS2 isoenzyme declined considerably in the youngest leaves. In the tolerant varieties, however, these physiological parameters did not change under drought, only the sequential senescence of leaf levels accelerated in some cases compared to the control, well-watered plants. Our results revealed that GS is a good indicator of drought stress, which can be applied for the characterization of wheat cultivars in terms of drought stress tolerance.

Original languageEnglish
Pages (from-to)48-54
Number of pages7
JournalPlant Physiology and Biochemistry
Volume67
DOIs
Publication statusPublished - Jun 2013

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Ribulose-Bisphosphate Carboxylase
Glutamate-Ammonia Ligase
Droughts
glutamate-ammonia ligase
ribulose-bisphosphate carboxylase
drought tolerance
Isoenzymes
Triticum
isozymes
wheat
leaves
water stress
Agriculture
filling period
Nitrogen
water metabolism
Oxygenases
Proteins
Plastids
agriculture

Keywords

  • DPA
  • Drought stress
  • FW
  • Glutamine synthetase
  • GMH
  • GS
  • PVDF
  • Rubisco
  • RWC
  • Senescence
  • Wheat

ASJC Scopus subject areas

  • Plant Science
  • Genetics
  • Physiology
  • Medicine(all)

Cite this

Metabolic indicators of drought stress tolerance in wheat : Glutamine synthetase isoenzymes and Rubisco. / Nagy, Z.; Németh, Edit; Guóth, Adrienn; Bona, Lajos; Wodala, Barnabás; Pécsváradi, Attila.

In: Plant Physiology and Biochemistry, Vol. 67, 06.2013, p. 48-54.

Research output: Contribution to journalArticle

Nagy, Z. ; Németh, Edit ; Guóth, Adrienn ; Bona, Lajos ; Wodala, Barnabás ; Pécsváradi, Attila. / Metabolic indicators of drought stress tolerance in wheat : Glutamine synthetase isoenzymes and Rubisco. In: Plant Physiology and Biochemistry. 2013 ; Vol. 67. pp. 48-54.
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