Photoprotection of PSII in Hawaiian lobeliads from diverse light environments

Rebecca A. Montgomery, Guillermo Goldstein, Thomas J. Givnish

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Excess irradiance can reduce the quantum yield of photosynthesis via photoprotective energy dissipation, inactivation or downregulation of PSII. We examined variation in photoprotection as part of a study of adaptive radiation in photosynthetic light responses by Hawaiian lobeliads. We measured the maximum efficiency of PSII (Fv/Fm) and recovery of F v/Fm after high light stress in field populations of 11 lobeliad species and in four species growing under common-garden greenhouse conditions. Species showed no difference in Fv/Fm (0.82:±:0.02 (mean:±:s.e.)) or in their ability to recover from light stress under field conditions. Average recovery was 74:±:1.4% within 1:h of removal of the stress suggesting that all species maintain the ability to recover from high light stress, at least in the short-term. In contrast, the results from the common-garden indicate that long-term exposure to high irradiance and associated higher temperatures can cause a sustained reduction in PSII function. Species showed decreased Fv/Fm and percentage recovery as treatment irradiance increased. Fv/F m and percentage recovery were positively related to native habitat PFD across species, suggesting that there has been a diversification in high light tolerance, with species from sunnier environments better able to avoid sustained declines in PSII function.

Original languageEnglish (US)
Pages (from-to)595-605
Number of pages11
JournalFunctional Plant Biology
Issue number7
StatePublished - 2008


  • Adaptive radiation
  • Chlorophyll fluorescence
  • Common garden
  • Non-photochemical quenching
  • Photochemical reflectance index
  • Xanthophyll-cycle pigments


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