A note on the growth of Labisia pumila under different light conditions

Philip, E. and Jaafar, H. Z. E. and Rizal, M. K. M. (2009) A note on the growth of Labisia pumila under different light conditions. Journal of Tropical Plant Physiology, 3. ISSN 1985-0484

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Abstract

A study on light response curves of L. pumila growing under three different light intensities from two different locations in Selangor viz. Sungai Congkak Forest Reserve (planted on forest floor receiving about 100 µmol m-² S-¹) and Sungai Tekala Forest Reserve (growing naturally on forest floor and receiving about 60 µmol m-² S-¹); planted in the open area receiving about I000 µmol m-² S-¹), was carried out. The main objective of the study was to document the light saturation level for optimum physiological growth of L. pumila tbr domestication. Maximum photosynthesis of L. pumila was recorded at 200 µmol m-² S-¹ when the relative humidity recorded at 90%. The Fv/FM values for plants under planted forest floor, growing naturally on forest floor and planted in the open were 0.83, 0.80 and 0.65, respectively, indicating that L. pumila is sensitive to high light at I000 µmol m-² S-¹. Plants under full light also exhibited smaller (185 vs 502 cm²) leaves with lighter green shade (relative chlorophyll content 29.1 vs 70.5) compared to those under closed canopy offorest reserve (at respective 502 cm ²'and 70.5).

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