Abstract
Photosynthetic activities of the sago palm (Metroxylon sagu Rottb.) were studied to find out its sensitivity to changes in ambient air temperature. The minimum ambient air temperature designed for the experiment was 25–29 °C, while the higher end was 29–33 °C. Several photosynthetic parameters were studied to support our analysis in sago photosynthetic activity, including diurnal leaf gas exchange, assimilation rate vs. CO2 concentration, leaf greenness, leaf chlorophyll content, and photosynthetic rate vs. irradiance. We found that sago palm photosynthetic activity tends to be more sensitive to minimum than to maximum ambient air temperature. The plants exposed to higher air temperatures had dark green leaf color associated with higher rates of diurnal photosynthesis, chlorophyll content, and rubisco limited photosynthetic activity. They also exhibited higher trend in optimum irradiance absorption level. Consequently, maximum light energy dissipation occurred at higher temperatures.
Highlights
Ambient air temperature generally has a significant impact the physiological performance of plants
°C room conductance leafclosed transpiration rate (Tr ) values the two air temperature temperature, and
According to the above findings, we conclude that sago palm photosynthetic performance is According to the above findings, we concludeespecially that sagoatpalm photosynthetic performance is affected by changes in ambient air temperature the minimum air temperature tested
Summary
Ambient air temperature generally has a significant impact the physiological performance of plants. Many studies reveal that inhibition of photosynthetic performance occurs at severely high (>35 ◦ C) and low temperatures (
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