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Sun Guchou. RELATIVE HEAT TOLERANCE OF ANABAENA AZOLLAEMEASURED BY THE CHLOROPHYLL-FLUORESCENCE METHOD[J]. Plant Science Journal, 1987, 5(3): 253-256.
Citation: Sun Guchou. RELATIVE HEAT TOLERANCE OF ANABAENA AZOLLAEMEASURED BY THE CHLOROPHYLL-FLUORESCENCE METHOD[J]. Plant Science Journal, 1987, 5(3): 253-256.
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RELATIVE HEAT TOLERANCE OF ANABAENA AZOLLAEMEASURED BY THE CHLOROPHYLL-FLUORESCENCE METHOD

  • South China Institute of Botany, Academia Sinica

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  • Received Date: January 17, 1986
  • Revised Date: August 31, 1986
  • Published Date: September 22, 1987
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  • Heat tolerance was determined for Anabaena azollae. The decrease in the variable fluorescence (Fv) yield at 680 nm after heating filaments of A. azollae at 37℃, 45℃and 50℃ each for 5 min. was found as compared with that at 25℃. The ratio of Fv to instantaneous fluorescence (Fo)was 0.35 at 25℃ and the decreases following heating at 37℃and 45℃ were found. And these ratios were 0.27 and 0.11, respectively, As compared with that at 25℃, the relative heat tolerances were 77.2% and 31.5%, respectively. The results showed that the filaments of A. azollae can stand with the temperature stress lower than 37℃ typical observed in the summer.
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