Preliminary study of the effect of ultraviolet radiation and low high intensity on muskmelon (Cucumis melo).
1990
Muhamad Awang | Azelan Syed Abdul Hassan S. | Mazlan Othman | Sham Sani
The present study attempts to examine the response of muskmelon to UV-enhancement. It is part of an extensive study to gauge the impact of likely increased of UV radiation following stratospheric ozone depletion on some selected tropical plants. Using a controlled chamber, muskmelon seedlings were subjected to three different types of light regimes including ultraviolet irradiation enhancement. Young and fully developed leaves of stages 3 and 4 were selected to determine diffusive resistance, transpiration rate, stomatal density, rates of photosynthesis and respiration, chlorophyll content and changes in anatomical structure. The result indicate that although chlorophyll content is less sensitive, photosynthetic and respiratory activities are highly affected by UV enhancement. Plants irradiated with UV enhancement showed significant reduction in photosynthetic rate - exceeding 30 percent compared to control plants. Plants raised under low PPFD exhibited even greater reduction in photosynthetic and respiratory activities. In addition, leaves developed under UV irradiation enhancement also produced scorching and glazing or chlorosis effects. Anatomically, UV irradiation had significant effects on the upper epidermis, palisade layer and spongy mesophyll.
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