Some characteristics of reduced leaf photosynthesis at midday in maize growing in the field

Maize was grown in the high-radiation arid summer environment of Davis, California, and its leaf photosynthetic rate was measured over diurnal courses on cloudless days with the leaf held perpendicular to the sunlight

Tadashi Hirasawa

2002

Scholarcy highlights

  • Maize was grown in the high-radiation arid summer environment of Davis, California, and its leaf photosynthetic rate was measured over diurnal courses on cloudless days with the leaf held perpendicular to the sunlight
  • On days of high atmospheric vapor pressure deficit, leaf photosynthesis reached a maximum in the late morning and decreased gradually as the day progressed, though the soil was well irrigated
  • Photosynthetic capacity was similar for the two periods and there was no evidence of photoinhibition by the high photosynthetic photon flux density at noon
  • Ci and photosynthetic rates A measured over a range of photon flux density were lower in the afternoon than in the morning
  • On a day of low VPD, midday depression in A and epidermal conductance were not evident for the well-irrigated plants
  • The midday reduction in conductance and A was more likely the result of low leaf water potential caused by high transpiration rates

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