Light, leaf surface area, and strong wind effects on transpiration rate of Coleus blumei by pressure monitoring

Authors

Brian D. Maraña ⋅ PH National Institute of Physics, University of the Philippines Diliman
Leo Mendel Rosario ⋅ PH National Institute of Physics, University of the Philippines Diliman
Ruby Joan Teves ⋅ PH National Institute of Physics, University of the Philippines Diliman
Carlo Mar Blanca ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

Transpiration rates are measured for varying simulated environmental conditions by pressure monitoring. The rate by which Coleus blumei releases water vapor through stomata is proportional to both light source power output (intensity) and the leaves' surface area. For light sources with outputs of 50, 75, and 100 W, the transpiration curves show linear trend with slopes of 0.0006, 0.0008, and 0.0021 kPa/s, respectively. Rates of 0.0015, 0.0010, and 0.009 kPa/s correspond to lower epidermal surface areas of 213.04, 129.9, and 60.62 cm², respectively. Coleus shows transpiration even in the absence of light, and the plant's regulatory mechanism to conserve water at sufficiently strong wind is responsible for the drop of rate as wind speed is increased.

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Issue

2007: Proceedings of the 25th Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2007-3G-02

Section

Instrumentation and Environmental Physics

Published

2007-10-24

How to Cite

[1]

BD Maraña, LM Rosario, RJ Teves, and CM Blanca, Light, leaf surface area, and strong wind effects on transpiration rate of Coleus blumei by pressure monitoring, Proceedings of the Samahang Pisika ng Pilipinas 25, SPP-2007-3G-02 (2007). URL: https://proceedings.spp-online.org/article/view/SPP-2007-3G-02.