Characterization of photosystem II heterogeneity in response to high salt stress in wheat leaves (Triticum aestivum)

Pooja Mehta, Suleyman I. Allakhverdiev, Anjana Jajoo

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

The effect of high salt stress on PS II heterogeneity was investigated in wheat (Triticum aestivum) leaves. On the basis of antenna size, PS II has been classified into three forms, i. e., α, β, and γ centers while on the basis of electron transport properties of the reducing side of the reaction centers, two distinct forms of PS II have been suggested, i. e., QB reducing centers and QB non-reducing centers. The chlorophyll a (Chl a) fluorescence transients, which can quantify PS II behavior, were recorded using PEA to derive OJIP in vivo with high time resolution and further analyzed according to JIP test. Our results showed that with an increase in the salt concentration during growth, the number of QB non-reducing centers increased. In antenna size heterogeneity the number of β and γ centers increased while the number of α centers decreased. A change in the energetic connectivity between the PS II units was also observed. Recovery studies showed that antenna heterogeneity was completely recovered from damage at 0. 5 M NaCl concentration and partially recovered at 1 M NaCl concentration while reducing side heterogeneity showed no recovery at all after 0. 5 M onwards.

Original languageEnglish
Pages (from-to)249-255
Number of pages7
JournalPhotosynthesis research
Volume105
Issue number3
DOIs
Publication statusPublished - Jan 1 2010

Keywords

  • Antenna size
  • Heterogeneity
  • High salt stress
  • Photosystem II

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

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