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http://dx.doi.org/10.12791/KSBEC.2015.24.3.161

Development of A Two-Variable Spatial Leaf Photosynthetic Model of Irwin Mango Grown in Greenhouse  

Jung, Dae Ho (Department of Plant Science and Research Institute of Agriculture and Life Science, Seoul National University)
Shin, Jong Hwa (Department of Horticulture and Breeding, Andong National University)
Cho, Young Yeol (Major of Horticultural Science, Jeju National University)
Son, Jung Eek (Department of Plant Science and Research Institute of Agriculture and Life Science, Seoul National University)
Publication Information
Journal of Bio-Environment Control / v.24, no.3, 2015 , pp. 161-166 More about this Journal
Abstract
To determine the adequate levels of light intensity and $CO_2$ concentration for mango grown in greenhouses, quantitative measurements of photosynthetic rates at various leaf positions in the tree are required. The objective of this study was to develop two-variable leaf photosynthetic models of Irwin mango (Mangifera indica L. cv. Irwin) using light intensity and $CO_2$ concentration at different leaf positions. Leaf photosynthetic rates at different positions (top, middle, and bottom) were measured by a leaf photosynthesis analyzer at light intensities (0, 50, 100, 200, 300, 400, 600, and $800{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$) with $CO_2$ concentrations (100, 400, 800, 1200, and $1600{\mu}mol{\cdot}mol^{-1}$). The two-variable model consisted of the two leaf photosynthetic models expressed as negative exponential functions for light intensity and $CO_2$ concentrations, respectively. The photosynthetic rates of top leaves were saturated at a light intensity of $400{\mu}mol{\cdot}^{-2}{\cdot}s^{-1}$, while those of middle and bottom leaves saturated at $200{\mu}mol{\cdot}^{-2}{\cdot}s^{-1}$. The leaf photosynthetic rates did not reach the saturation point at a $CO_2$ concentration of $1600imolmol^{-1}$. In validation of the model, the estimated photosynthetic rates at top and bottom leaves showed better agreements with the measured ones than the middle leaves. It is expected that the optimal conditions of light intensity and $CO_2$ concentration can be determined for maximizing photosynthetic rates of Irwin mango grown in greenhouses by using the two-variable model.
Keywords
$CO_2$ concentration; leaf position; light intensity; negative exponential model;
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Times Cited By KSCI : 4  (Citation Analysis)
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