Photosynthesis of Sago Palm ( Metroxylon sagu Rottb.) Seedling at Different Air Temperatures

Aidil Azhar, Daigo Makihara, Hitoshi Naito and Hiroshi Ehara
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Aidil Azhar: Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-0814, Japan
Daigo Makihara: International Cooperation Center for Agricultural Education, Nagoya University, Nagoya 464-0814, Japan
Hitoshi Naito: College of Life Science, Kurashiki University of Science and The Arts, Kurashiki 712-8505, Japan
Hiroshi Ehara: International Cooperation Center for Agricultural Education, Nagoya University, Nagoya 464-0814, Japan

Agriculture, 2018, vol. 8, issue 1, 1-10

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. CO 2 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.

Keywords: carbon response curve; light response curve; photosynthesis; pigment determination; sago palm (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2018
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