Growth and Development of Radish (Raphanus sativus, L.) Under Selected Light Environments*

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Abstract
Plants of radish (Raphanus sativus L.) were grown under selected light conditions in controlled environmental chambers in order to monitor the role of photoperiod, irradiance level and input light energy in plant development. Results indicated that the daily input of light energy was the most important light factor affecting leaf development while photoperiod and irradiance level had the major influences on storage organ development. Distribution of assimilates to leaves and storage organs varied under different light regimes with long photoperiods and high irradiances producing the largest storage organs. Once initiated, the rate of storage organ growth was similar under all tested light environments.