Bioassimilation behaviour of tomato seedling cultivars under different sources of artificial light

  • Eva María Almansa /
  • Antonio Espín /
  • Rosa María Chica /
  • María Teresa Lao
Journal ar
Australian Journal of Crop Science
  • Volumen: 8
  • Número: 6
  • Fecha: 01 enero 2014
  • Páginas: 873-880
  • ISSN: 18352707 18352693
  • Tipo de fuente: Revista
  • Tipo de documento: Artículo
  • Editorial: Southern Cross Publishing and Printing Pty
The behaviour of fifteen tomato cultivars under different lights was carried out and quality of seedlings (biomass, plant structure, water status, carbohydrates starvation), was studied. The lamps used were compact fluorescent (184 W·m-2), high efficiency fluorescent (140 W·m-2) and tubular don's bulb fluorescent (108 W·m-2). The trial was carried out in a culture chamber with the temperature and relative humidity continuously controlled (34 °C and 55% RH, respectively) and continuous light for 30 days. Experimental design consisted of three lighting treatments with 10 replications for each variety and treatments. Spectral radiation of artificial lighting sources was measured at canopy level. Fractions mass (leaves, stems and roots) were weighed fresh and dry. The total fresh weight: total dry weight relationship, sugars and starch concentration were quantified. Cultivars did not show the same behaviour under light treatments. The maximum response in biomass production of cultivars is obtained under high efficiency fluorescent treatment (16.56 W·m-2 PAR). For all cultivars, the relationship between total fresh weight and total dry weight presented the lowest value under high efficiency fluorescent treatment (low ratio, grate hardening). Starch quantity was higher than sugars for all treatments. 'Ikram' cultivar has the greatest capacity to synthesize carbohydrates in all treatments. Plants, under lighting with high efficiency fluorescents, show the highest quality (leaf mass is lower; root partitioning is unaffected with greater hardening and the highest amounts of total carbohydrates synthesized).

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