Abstract
The effects of light intensity on growth, flowering, and nutritional status of Phalaenopsis were studied.The development of leaves and roots, dry matter production, reducing sugar contents, and amount of nitrogen absorption decreased with a reduction in light intensity; but concurrently, the concentration of 80% ethanol soluble nitrogenous compounds increased. With the reduction in reducing sugar, nitrogen absorption and assimilation were inhibited. Low nitrogen efficiency for dry matter production probably resulted from inhibition of assimilation under a low light condition. All plants initiated flower stalks and flowered under a high light condition, but the percentage of flowering plants decreased to 13 to 0% under moderate and low light conditions, respectively. High light conditions enhanced the length of flower stalks and the number of flowers per inflorescence. The inhibition of flower stalk emergence and flowering under low light conditions is attributed to the decrease in reducing sugar concentraion and to the accumulation of 80% ethanol soluble nitrogenous compounds.
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