Proceedings Volume 2010 (format .pdf) - SimpBTH

EXPERIMENTS ON LASER RADIATION INFLUENCE ON THEDEVELOPMENT AND GROWTH OF SEEDLINGS OF EGGPLANT(SOLANUM MELONGENA SP.-VARIETY" DRAGAICA")DANAILA GUIDEA SILVANA M.¹, ESOFINA RISTICI², BURNICHIFLOAREA³,MARIAN RISTICI², PETRU NICULIŢĂ¹,DRAGHICI MIHAELA¹, DUMITRU CATALIN¹¹U.Ş.A.M.V. Bucuresti – Faculty of Biotechnology ;²4R OPTICS SRL. Bucuresti³Research and Development Station for Vegetables Growing BuzauABSTRACTAdditional red light illumination produced by laser diodes in continuous and differentexposure times, was applied to „eggplant” seeds (Solanum melongena sp.) from Romanian type“Dragaica”.Sets of seeds were irradiated once in the first day of the experiment at different energydoses by changing exposure time. Thus, four dry seed lots were irradiated at different doses during theperiod from 2009 and 2010 corresponding variants V1-V4 (5-20 minutes). The experimental resultswere analyzed in parallel with a control group of seeds that did not treated with red laser diodes.The capacity of germination and the growth rithm were studied for all seeds of eggplantSolanum melongena-variety "Dragaica by the determining the germination rates every two days for 3weeks.Results have shown a percentage of germination higher than that for the control group ofseeds (75%) for all repetitions of variant V4 (95%), with the time exposure of 20 minutes (1.53 joules /cm ²). In the treatment was used red light produced by 19 laser diodes.To seedlings of eggplants resulted from seeds irradiated in an experimental series S1-2010were made observations on the dynamics of formation of true leaves at 14 and 30 days after the onsetof germination, compared with control group seedlings.Key words: laser radiation, germination seeds, plant growth, eggplant.INTRODUCTIONBodies known plant can not grow in the absence of light. In fact, light iselectromagnetic radiation with wavelengths in the range 400 nm - 750nm. In nonprotectedareas, light reaching the plants is generated by the sun, while in protectedareas light is generated by sources with certain spectral characteristics (Anghel, S.,et al., 1999; Călugăreanu M., et al., 1999;).Light is to plants, both a source of energy and information. It is a sourceof energy for photosynthesis and a source of information for photoperiodism (night/ day), phototropism (light direction) and photomorphogenesis (quantity andquality of light). The light in the spectral range 640 nm - 660nm is very importantconsidering that chlorophyll absorbs strongly in this range. Red field - about 660-670nm, is important to the absorption bands of chlorophylls, a 'and' b ' ( Quail,P.,H.,1991).31