Effects of Photoperiod on Vegetative Growth, Flowering and Fruiting of Capsicum frutescens L. and C. annuum L. in Japan

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  • YAMAMOTO Sota
    Laboratory of Tropical Agriculture, Graduate School of Agriculture, Kyoto University
  • MISUMI Mayo
    Laboratory of Tropical Agriculture, Graduate School of Agriculture, Kyoto University
  • NAWATA Eiji
    Laboratory of Tropical Agriculture, Graduate School of Agriculture, Kyoto University

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Abstract

We investigated the effects of photoperiods (6-, 9-, 12-, or 24-h) on the vegetative growth, flowering and fruiting of two Capsicum frutescens L. lines from the Bonin and Ryukyu islands in Japan and C. annuum cv. ‘Takanotsume’ (referred to as BON, RYU, and TK, respectively). BON, RYU, and TK plants had better vegetative growth as photoperiod lengthened; plants were taller, and the dry weight of shoots and roots was greater. The leaf area of TK was not affected by photoperiod, whereas the leaf areas of BON and RYU were smaller when grown under a 24-h photoperiod than under a 12-h photoperiod because leaf abscission occurred sooner under a 24-h photoperiod. TK also had better reproductive growth as the photoperiod lengthened; flowers and fruits were more numerous, the fresh and dry weights of fruits were greater, and the percentage of fruit set was higher. Under a 24-h photoperiod, however, the flower bud development of BON and RYU was initially not observed. BON finally flowered under a 24-h photoperiod, but RYU did not. These results suggest that BON and RYU responded photoperiods more strictly than TK and there may be various responses to photoperiods in flowering and fruiting among lines of C. frutescens.

Journal

  • Environment Control in Biology

    Environment Control in Biology 46 (1), 39-47, 2008

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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