Development and Dormancy of Tuber of Gloriosa superba L. Grown in Different Season

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  • 栽培時期の異なるグロリオサの塊茎肥大ならびに休眠様相
  • サイバイ ジキ ノ コトナル グロリオサ ノ カイケイ ヒダイ ナラビニ キュウミン ヨウソウ

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Abstract

Effects of cultivating season on growth and dormancy of Groliosa superba L. tubers were investigated using three genotypes ‘Misato Red’, ‘Tropical Red’ and ‘Rose Queen’. Twenty tubers of each genotype were planted on December 2nd (winter culture) in a plastic house kept above 10°C, on April 3rd (spring culture) in a glasshouse kept above 10°C, and on July 3rd (summer culture) in a glasshouse with ambient temperature, respectively. The fastest growth of tubers was observed in summer culture, and the slowest in winter culture. Secondary tuber formation occurred in spring and summer culture, especially for ‘Tropical Red’ and ‘Rose Queen’. In winter culture, the period required to sprout new tubers, i.e. index of dormancy, increased with development and peaked at the time of flowering, and then became shorter. In spring and summer culture, tuber dormancy was the same as that in winter culture, but it was rather inconsistent among genotypes in the late stage of tuber development.<br>

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