Night break treatment using different light sources promotes or delays growth and flowering of Eustoma grandiflorum (Raf.) Shinn.
Night break treatment using different light sources promotes or delays growth and flowering of Eustoma grandiflorum (Raf.) Shinn.
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DOI：
10.2503/jjshs1.77.69
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发表时间：
2008-01-01
影响因子：
--
通讯作者：
Kunitake, Toshihiro
中科院分区：
文献类型：
--
作者：
Yamada, Asuka;Tanigawa, Takahiro;Kunitake, Toshihiro
以洋桔梗‘Neilpeach Neo’为试材，研究不同光源对洋桔梗生长和开花的影响。使幼苗在温室中生长，并使用远红荧光灯、植物生长荧光灯、日光型荧光灯或白炽灯进行夜间休息处理，或者在未处理的条件下生长（对照）。在每种光源下，植株顶部的光合光子通量密度（PPFD）为5 μ mol·m（-2）·s（-1）。光源的红光（660+/-30 nm）：远红光（730+/-30 nm）比率分别为0.01、0.43、5.00和0.65。在远红光荧光灯下，从种植到开花的时间为46天，而对照为66天。白炽灯和植物生长荧光灯也缩短了花的萌芽时间，但日光型荧光灯比对照推迟花萌芽4天。不同的光源条件对花芽分化后的开花时间影响不大或没有影响。远红型荧光灯、白炽灯和植物生长型荧光灯均减少了第一小花花期主茎上的节数，而日光型荧光灯则增加了节数。远红光灯和白炽灯促进了节间的伸长，日光灯使节间长度减小。此外，一个红色的荧光灯与R：FR比为105延迟花萌芽和开花，并增加了植物的节数与对照相比，无论在7月和8月的长日照长度。因此，认为采用适当的光源进行长日照处理，可以控制洋桔梗的生长和开花时间。
Night break treatment was applied to Eustoma grandiflorum 'Neilpeach Neo' using different light sources to investigate growth and flowering responses. The seedlings were grown in a greenhouse and treated with night break treatment using a far-red fluorescent lamp, a plant growth fluorescent lamp, a daylight-type fluorescent lamp or an incandescent lamp, or were grown under non-treated conditions (control). Photosynthetic photon flux density (PPFD) at the top of the plant was 5 mu mol.m(-2).s(-1) under each light source. The red (660+/-30 nm): far-red (730+/-30 nm) ratio of the light sources was 0.01, 0.43, 5.00, and 0.65, respectively. The time from planting to flower budding was 46 days for plants grown under a far-red light fluorescent lamp, compared with 66 days in the control. The incandescent lamp and plant growth fluorescent lamp also reduced the time to flower budding; however, the daylight-type fluorescent lamp delayed flower budding by 4 days compared with the control. The light source regimes had little or no effect on the time to flowering after flower budding. The far-red fluorescent lamp, incandescent lamp and plant growth fluorescent lamp reduced the number of nodes on the main stem at the anthesis of the first floret, while the daylight-type fluorescent lamp increased the number of nodes. The far-red fluorescent lamp and incandescent lamp promoted internode elongation, while the daylight-type fluorescent lamp reduced internode length. Moreover, a red fluorescent lamp with a R: FR ratio of 105 delayed flower budding and flowering, and increased the number of nodes of the plants as compared with the control, regardless of the long day lengths in July and August. Thus, it is considered that the growth and flowering time of Eustoma grandiflorum can be controlled by long-day treatment carried out with the proper type of light source.