Effect of heat stress on the photosynthetic apparatus in maize (Zea mays L.) grown at control or high temperature

The effects of short exposure to heat stress in the dark on maize seedlings grown at 25 °C or 41 °C were investigated by means of chlorophyll fluorescence and oxygen evolution

Veerana Sinsawat

2004

Scholarcy highlights

  • The effects of short exposure to heat stress in the dark on maize seedlings grown at 25 °C or 41 °C were investigated by means of chlorophyll fluorescence and oxygen evolution
  • Exposure of plants grown at 25 °C to 35 °C for 20 min in the dark led to a transient inhibition of the rate of photosynthesis, which recovered within 4 h
  • Treatments at temperatures above 45 °C led to permanent damage; the plants did not recover within 96 h
  • Improved thermo-tolerance as a result of high growth temperature was not related to the presence of zeaxanthin, since it did not accumulate in heat-stressed leaves in the dark
  • In plants grown at 25 °C, measurements of the quantum yield of electron transport at PSII in leaves infiltrated with methylviologen indicated the presence of a heat-sensitive component of the photosynthetic apparatus, located downstream of photosystem II and before the carbon cycle

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