Publication Date
1997
Description
Three varieties each in Panicum maximum (PM) and P. coloratum (PC) were measured for the seasonal changes in the gas exchange rate in the field at Miyazaki, Japan. The gross photosynthetic rate (Pg) under the same photosynthetic active radiation (PAR) of 1000 μmol m-2s-1 and the dark respiratory rate (Rd) of leaf blade under the mean environmental air temperature on the measuring day differed among six varieties from autumn to the next spring. With the decrease in air temperature, the Pg and the Rd in the varieties of PM (typically, coldsensitive Natsukaze (NAT)) declined more rapidly than those of PC (typically, cold-tolerant Makarikari (MAK)). The regression coefficients of the Pg to chlorophyll concentration differed among varieties and it was suggested that the decrease in the chloroplast efficiency with the decreasing of air temperature was significantly greater in NAT and Coloured guineagrass (COL) than in MAK.
Citation
Cai, Q S.; Ishii, Y; and Ito, K, "Seasonal Changes in Photosynthetic Rate of 6 Panicum Genotypes" (2024). IGC Proceedings (1993-2023). 10.
https://uknowledge.uky.edu/igc/1997/session22/10
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Seasonal Changes in Photosynthetic Rate of 6 Panicum Genotypes
Three varieties each in Panicum maximum (PM) and P. coloratum (PC) were measured for the seasonal changes in the gas exchange rate in the field at Miyazaki, Japan. The gross photosynthetic rate (Pg) under the same photosynthetic active radiation (PAR) of 1000 μmol m-2s-1 and the dark respiratory rate (Rd) of leaf blade under the mean environmental air temperature on the measuring day differed among six varieties from autumn to the next spring. With the decrease in air temperature, the Pg and the Rd in the varieties of PM (typically, coldsensitive Natsukaze (NAT)) declined more rapidly than those of PC (typically, cold-tolerant Makarikari (MAK)). The regression coefficients of the Pg to chlorophyll concentration differed among varieties and it was suggested that the decrease in the chloroplast efficiency with the decreasing of air temperature was significantly greater in NAT and Coloured guineagrass (COL) than in MAK.
