Effects of Red-light Intensity during Long-day Treatment on Flowering and Cut Flower Quality in Eustoma grandiflorum Cultivars for Early-autumn Shipment

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  • トルコギキョウの初秋出し栽培における開花と切り花品質に及ぼす赤色光長日処理の光量と品種間差
  • トルコギキョウ ノ ショシュウ ダシ サイバイ ニ オケル カイカ ト キリバナ ヒンシツ ニ オヨボス セキショクコウ チョウジツ ショリ ノ コウリョウ ト ヒンシュ カンサ

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Abstract

Long-day treatment by pre-dawn lighting (6 h) was applied to Eustoma grandiflorum cultivars to investigate flowering responses and cut flower qualities for early-autumn shipment. Seedlings were irradiated by using bulb-type red-light fluorescent lamps, that R : FR ratio was 8.8, with photon flux density (PFD) of red-light (660±30 nm) of 0.1, 0.2 or 0.5 μmol·m−2·s−1. Control plants were grown under ambient day conditions of 14–15 h without long-day treatment. The times from planting to flower budding under long-day treatments were significantly longer than that of the controls. However, there was no significant difference among the times from planting to flower budding in each treatment. Long-day treatment with the highest red-light intensity showed the greatest increase in the number of nodes on the main stem at anthesis of the first floret. The stem lengths of plants grown under long-day treatment with red-light intensities above 0.2 μmol·m−2·s−1 were significantly longer than that of the control. Long-day treatment using bulb-type red-light fluorescent lamps was applied to 11 Eustoma cultivars. Compared with those of control plants, the times from planting to flower budding under long-day treatment were longer in 9 cultivars and the number of nodes on the main stem at anthesis of the first floret was increased to a maximum of 2.4 in 10 cultivars. Moreover, cut flower length under the long-day treatment was 11.3 cm longer at maximum and cut flower weights were increased in 9 cultivars at harvest (at anthesis of the third floret) compared with those of the controls. The increase in the number of nodes on the main stem under long-day treatment was significantly correlated with the days to flowering in the controls.<br>

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