Preprint Article Version 1 This version not peer reviewed

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

Version 1 : Received: 18 November 2017 / Approved: 20 November 2017 / Online: 20 November 2017 (07:36:39 CET)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Agriculture 2018, 8, 4
DOI: 10.3390/agriculture8010004

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 25–29⁰C, while the higher end was 29–33⁰C. 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.

Subject Areas

carbon response curve; light response curve; photosynthesis; pigment determination; sago palm.

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