Abstract

PANIAGUA-PARDO, Guillermo et al. Effect of high intensity led light on the germination and growth of broccoli seedlings (Brassica oleracea L.). Polibotánica [online]. 2015, n.40, pp.199-212. ISSN 1405-2768.

Given its nutritional value and health benefits by having anticancer compounds, broccoli (Brassica oleracea L.) has become an important crop in vegetables, therefore it is necessary to increase their consumption and production by Mexican society. This research evaluated the effect of high-intensity LED light of different wavelengths (red, blue and green), on germination and growth of broccoli seedling for 10 days, evaluating the variables germination rate (VG), germination percentage (PGF), average length of hypocotyl (LMH), fresh (PF) and dry weight (PS) of seedling, in search of alternative lighting for production in controlled environment. Exposure times of red, blue and green light of high-intensity LEDs were 12, six and three hours, with a complementary time for the last two treatments with white LED light. A completely randomized experimental design was used with four replications of 30 seeds per experimental unit. Statistically significant differences between treatments for evaluated variables were obtained: red light treatments showed the highest values of VG, where the red for 12 hours was the best with increases of 25% versus control. The LMH variable for the green treatment of 12 hours had an increase of 39% compared to control, becoming the best. On the other hand in PF variable, the greatest weight was presented in green treatment for 12 hours with an increase against the control of 16%. Finally in PS variable, the greatest weight was presented in red treatment for 12 hours with an increase against the control of 6%. These results showed that the physiological responses produced by exposure to different wavelengths of high intensity LED light in broccoli seed, varied according to the exposure time and type of wavelength used, in addition this type of lighting proved to be a viable option to improve the physiological quality of broccoli.

Keywords : broccoli; LED; growth; germination; physiology.

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