分光特性の異なるランプでの長日処理がブドウ「ピオーネ」の新梢生長に及ぼす影響

Abstract

The effect of long-day treatment with five lamps of different spectral characteristics on shoot growth of one-year-old own-rooted 'Pione' grapevines was investigated. Photon flux density (PFD) in each wavelength of physiologically active radiation (300-800 nm), red light (R, 600-700 nm), and far-red light (FR, 700-800 nm) emitted from the following five lamps : silica, blue-light, white-light, homolux (for plant growing) and red-light were determined. All lamps were lit just before sunset and daylength was prolonged to 16 hr for 11 weeks as from mid- August. Shoot elongation, number of nodes and leaf area per shoot, were significantly larger in vines exposed to lamps of homolux, red-light and silica as compared to the control vines, which were grown under natural daylength. Shoot growth of vines exposed to the white-light lamp was intermediate between those exposed to homolux and natural daylength, whereas in vines exposed to the blue-light lamp grew almost as well as the control vines. PFD (μmol·m-2·s-1) within the wavelength of red light of homolux, red-light and silica lamps were 0.157, 0.506 and 0.703, respectively. Nevertheless, these 3 lamps promoted shoot growth. PFD of red light emitted from the white-light and homolux lamps was almost the same, but white-light lamp had no peak at 660nm. R/FR (600-700 nm/700-800 nm) photon flux ratios also differed among the lamps, ranging from 0.50 to 19.46. Based on the results, the relationship between shoot growth of grapevines and spectral characteristics of each lamp is discussed in Japanese.