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KMID : 0903619960370060741
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Journal of the Korean Society for Horticultural Science
1996 Volume.37 No. 6 p.741 ~ p.745
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Effects of Light Intensity and Night Temperature in Sugar Accumulation of Muskmelon of Muskmelon in Warm Season
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Abstract
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Influences of light intensity and night temperature on sugar accumulation of nonsweet and sweet muskmelons in warm season were investigated. Soluble solid contents of nonsweet muskmelon ´Roan´ and ´Ans´ under low light intensity (30% light shade) decreased by 10%, while remarkably decreased by 20% in high sugar muskmelon ´Sugar´, ´Ase´ and ´S.R´. Soluble solid contents of low sugar muskmelon increased in 20/30℃ (night/day) but high sugar muskmelon continuously increased in 25/30℃. Sugar content of low sugar muskmelon under 30% light shade slowly reduced compared to non-shade treatments whereas notably decreased in high sugar muskmelon as the rate of light penetration decreasing. Maximum sugar content was observed in 15 and 20℃ in low sugar muskmelon but in 20 and 25℃ in high sugar muskmelon. Glucose and fructose content was not influenced by light intensity and temperature, but sucrose was greatly influenced by them. Net photosynthesis rate of nonsweet muskmelon was 30 μ㏖·CO₂·m^(-2)·s^(-1) and chlorophyll content was 51.0 whereas that of sweet muskmelon was 41.8-47.2 μ㏖·CO₂·m^(-2)·s^(-1) and chlorophyll content was 55.6-61.2. No consistent pattern was shown in respiration rate but respiration rate of nonsweet muskmelon was higher than that of sweet muslanelon.
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