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Effects of Day Length on Flowering and Rhizome Swelling in Ginger (Zingiber officinale Roscoe)

1989; Japanese Society for Horticultural Science; Volume: 58; Issue: 3 Linguagem: Inglês

10.2503/jjshs.58.649

1880-358X

Shinichi Adaniya, M. Shoda, Kunimitsu Fujieda,

Plant Physiology and Cultivation Studies

Photoperiodic treatments were carried out with three Japanese cultivars ('Kintoki', 'Sanshu' and 'Oshoga') of ginger (Zingiber officinale Roscoe). As day length was increased from 10h to 16h, the vegetative growth of the plants was enhanced, whereas it was inhibited and rhizome swelling was promoted as the day length was decreased from 16h to 10h. Further increase in day length from 16h to 19h did not give any rhizome swelling, and resulted in the lowering of the growth increment. The cultivar 'Sanshu' was most sensitive to photoperiod for rhizome swelling, but 'Oshoga' was relatively insensitive. In 'Sanshu' and 'Oshoga', many flower stalks bolted under the day length of 13h and 16h, but they emerged slightly or not at all under the day length of 10h, ND (decreasing natural daylength) and 19h. The photoperiodic response to flowering of 'Kintoki' was not very clear.