Abstract

CASIERRA-POSADA, Fánor; PENA-OLMOS, Jaime E  and  ULRICHS, Christian. Basic growth analysis in strawberry plants (Fragaria sp.) exposed to different radiation environments. Agron. colomb. [online]. 2012, vol.30, n.1, pp.25-33. ISSN 0120-9965.

The present study sought to understand how quantity and quality of light affect growth and development in strawberry plants. Plants were grown in a greenhouse in Tunja, Colombia, under different light quality regimes provided by polypropylene films (yellow, green, blue, transparent, red, and a control without plastic film cover). These colored filters also provided different shading levels to plants. The authors measured growth parameters and calculated various indices commonly used in basic plant growth analysis. Plastic light filters were placed 1 m above crop foliage and were kept in place from initial transplanting until final harvest. Net assimilation rate was reduced under colored filters, but not under the transparent film or the film-free control. Green cover induced an increase in leaf area ratio, root to shoot ratio, leaf weight ratio, and specific leaf area. Harvest index and absolute and relative growth rate were reduced in plants grown under green film. The growth response of strawberry plants was the consequence of the combined effect of light quantity and quality. Results also showed the striking influence of green light on strawberry growth.

Keywords : shading; light spectrum; light quantity; photomorphogenesis; colored films.

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