Flowering response to photoperiod in okra (Abelmoschus esculentus)

RITHICHAI Panumart, FUJIME Yukihiro, SUKPRAKARN Sutevee, TERABAYASHI Satoshi, OKUDA Nobuyuki, DATE Shuichi

doi:10.20809/seisan.11.1_33

The purpose of this study was to determine the effects of photoperiod on flower bud initiation in okra (Abelmoschus esculentus). Six accessions from Thailand and two cultivars from Japan were cultivated under natural day-length (12.21 to 14.26 hr), short-day (10 hr of natural light) and long-day (natural day-length plus additional fluorescent light, 3 μmol・m^<-2>・s^<-1>, for a total of 16 hr) photoperiods in early, mid and late summer in japan. Flower buds of HE022, HE035, HE045, HE047 and 'Clemson Spineless' formed at a lower node and earlier under short-day compared to long-day and natural day-length conditions in early, mid and late summer. Flower buds of HE015 and HE050 developed at a similar node and similar time regardless of photoperiod and season. Flower bud initiation in 'Emerald' fluctuated slightly with the different photoperiods and seasons. In all accessions and cultivars, flower buds continued to form under short-day conditions. But the reversion to a vegetative phase of growth after the appearance of flower buds was observed noto only in HE022, HE035, HE045, HE047 and 'Clemson Spineless' but also in HE050 and 'Emerald' under long-day conditions. Based on these results, it was thought that HE022, HE035, HE045, HE047, HE050, 'Clemson Spineless' and 'Emerald' might have a short-day response for flower bud initiation. HE015 might have a day-neutral response. The majority of photoperiodic responses for flower bud initiation in okra accessions from Thailand might have a short-day requirement.

Flowering response to photoperiod in okra (Abelmoschus esculentus)

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