Characterization of chilling effects on photosynthetic performance of maize crops during early season growth using chlorophyll fluorescence

Changes in a range of chlorophyll fluorescence parameters were monitored for leaves of crops of three Zea mays cultivars during early canopy development when large fluctuations in air temperatures occur

James R. Andrews

2007

Scholarcy highlights

  • Changes in a range of chlorophyll fluorescence parameters were monitored for leaves of crops of three Zea mays cultivars during early canopy development when large fluctuations in air temperatures occur
  • Fluctuations were observed in Fv/Fm, φPSII and Fv'/Fm' throughout the period and significant decreases occurred during periods of low temperatures and high photon flux densities, indicating chill-induced photoinhibition of photosynthesis
  • Changes in Fv/Fm were highly correlated with changes in φPSII for all three cultivars
  • Measurements of φPSII, Fv'/Fm', qP and the quantum efficiency of CO2 assimilation at a photon flux density of 1000 μmol m−2 s−1 were made for leaves at 08.00 h each morning and demonstrated that changes in φPSII were highly correlated with changes in CO2 assimilation
  • Chill-induced changes in φPSII were shown to be correlated with changes in the quenching of excitation energy in the antennae of photosystem II and not with changes in the redox state of the electron acceptors of photosystem II
  • It is concluded that measurements of Fv/Fm and φPSII provide useful, rapid and non-invasive probes of the photosynthetic performance of maize leaves in the field during periods of chill-induced photoinhibition

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