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

Photosynth Res. 2010 Sep;105(3):249-55. doi: 10.1007/s11120-010-9588-y. Epub 2010 Aug 21.

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., Q(B) reducing centers and Q(B) 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 Q(B) 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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Photosystem II Protein Complex / drug effects*
  • Photosystem II Protein Complex / metabolism
  • Plant Leaves / drug effects*
  • Plant Leaves / metabolism
  • Sodium Chloride / pharmacology*
  • Stress, Physiological*
  • Triticum / drug effects*
  • Triticum / metabolism*

Substances

  • Photosystem II Protein Complex
  • Sodium Chloride