Growth in length of the embryonic radicles of sweet sorghum plantlets (sorghum bicolor subsp. bicolor), resulted from caryopsis germination on paper filter substrate, exposed to different types of light

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Article Title:	Growth in length of the embryonic radicles of sweet sorghum plantlets (sorghum bicolor subsp. bicolor), resulted from caryopsis germination on paper filter substrate, exposed to different types of light
Authors:	Iulian O. Stana, Dorina Cachiţă – Cosma
Affiliation:	”Vasile Goldis” West University of Arad, România Institute of Life Sience, ”Vasile Goldiş”, West University of Arad, România
Abstract:	In this study, we used sorghum caryopsis (Sorghum bicolor subsp. bicolor), to investigate the radicle system formation developming of plantlets, as their germination and growth occurred on filter paper, iluminated with natural, or different colors of fluorescent light. Sorghum plantlets, generated from zygotic embryos, in the first 10 days of germination, can be used as experimental models in a series of studies regarding the plant physiology. The development of embryonic radicles exposed to natural light, continuous darkness or in fluorescent light – different colors – different wavelengths, mark an increase of radicles length, which is dependent on the applied light regime. The most significant increase of radicles length had occurred in samples kept in continuous darkness, or illuminated 16h/day with green or blue fluorescent light. Percentage values recoreded for this parameter (compared to white fluorescent light samples, considered as reference lot) are higher with 75, respectively 45%, exceeding the average increase of embryonic radicles in samples exposed for 10 days to continuous darkness. Obviously, radices dry weight biomass of these variants register an increase, but only by 27-28%.
Keywords:	Sorghum, germination, radilcles, lenght, light
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