Effect of Low Growth-temperature on Photosynthetic O_2 Evolution and Chlorophyll Fluorescence in Zoysiagrasses

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  • ゾイシアグラスの光合成酸素発生とクロロフィル蛍光に対する低温での生育温度の影響
  • Effect of Low Growth-temperature on Pho

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Abstract

The zoysiagrasses are indigenous to Japan and are distributed nationwide with wide variation of growth characteristics. The temperature responses of photosyn-thesis among seven strains of zoysiagrasses from different origins were studied using the plants grown for a week with gradual decrease of the growth temperatures (35/30℃ to 10/7℃). The CO_2-saturated O_2 evolution and chlorophyll fluorescence (Fv/Fm) were measured at 25℃. A large interstrainal difference for the photosynthetic O_2 evolution were observed on the zoysiagrasses grown under low temperatures. Such variations were correlated with the inhibition of PSII estimated from the changes of chlorophyll fluorescence (Fv/Fm). However, these photosynthetic susceptibilities to low growth temperatures of seven zoysiagrsses were not related to the climatic condition of the provenience districts of strains. The results suggest that the photosynthetic sensitivity to low growth temperatures is not the main factor to deter-mine the northern limit of the growth of strains.

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