Shortening of the Development Period in Daikon (Raphanus sativus var. longipinnatus) under Environment Control

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  • Fujieda Kunimitsu
    Horticultural Laboratory, Faculty of Agriculture, Kyushu University
  • Fujita Yukio
    Horticultural Laboratory, Faculty of Agriculture, Kyushu University
  • Yoo Keun-Chang
    Horticultural Laboratory, Faculty of Agriculture, Kyushu University

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Other Title
  • 環境制御によるダイコンの世代促進
  • カンキョウ セイギョ ニヨル ダイコン ノ セダイ ソクシン

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Abstract

The treatment leading to substantial shortening of the life-cycle of daikon for seed production was studied. The germinated seeds of an early daikon cultivar ‘Shijunichi’ were vernalized at 5℃ for 10 days, whereupon they were planted in 12cm plastic pots and were grown under continuous illumination at a light intensity of 8,000lux and a temperature of 25℃. The life-cycles of the S_0(open pollinated), the S_1(one selfed) and the S_2(twice selfed) plants treated as above were completed for 52, 55 and 55 days, respectively. The average number of seeds per plant was 73 in the S_0 population, 44 in the S_1 and 42 in the S_2. These seeds had normally the ability to germinate, although were small especially in the selfed generations. These results suggest that four or five generations a year could be achieved by this procedure in most cultivar, except for extremely late cultivars. Since there is no thickening root phase in the life-cycle of the treated plants, it is meaningless to try the selection of practical characters. In using the procedure, however, it will lead to substantial shortening of the life-cycle for seed production of hybrids and raising of inbred lines in breeding work.

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