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Agriculture 2018, 8(1), 4; doi:10.3390/agriculture8010004

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

1
Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-0814, Japan
2
Vocational School, Bogor Agricultural University, Bogor 16680, Indonesia
3
International Cooperation Center for Agricultural Education, Nagoya University, Nagoya 464-0814, Japan
4
College of Life Science, Kurashiki University of Science and The Arts, Kurashiki 712-8505, Japan
5
Applied Social System Institute of Asia, Nagoya University, Nagoya 464-0814, Japan
*
Authors to whom correspondence should be addressed.
Received: 27 October 2017 / Revised: 6 December 2017 / Accepted: 20 December 2017 / Published: 1 January 2018
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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. View Full-Text
Keywords: carbon response curve; light response curve; photosynthesis; pigment determination; sago palm carbon response curve; light response curve; photosynthesis; pigment determination; sago palm
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MDPI and ACS Style

Azhar, A.; Makihara, D.; Naito, H.; Ehara, H. Photosynthesis of Sago Palm (Metroxylon sagu Rottb.) Seedling at Different Air Temperatures. Agriculture 2018, 8, 4.

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