A aná lis e quí mic a do exs uda to rad icu lar do sor go res ult ou na ide nti fic açã o da qui non a sor gol eon a 1 e da dii dro qui non a 2, como seu s pri nci pai s con sti tui nte s. Em tes tes in vit ro , uma sol uçã o a 20 M do exs uda to cau sou red uçã o de 13, 1% no cre sci mento rad icu lar de Lac tuc a sat iva L.Em um sis tem a de cul tur a hid rop ôni co rec ircul ant e, o exs uda to rad icu lar pro duz ido por qua tro pla nta s de sor go cau sou uma red uçã o de 62, 4% na áre a fol iar da alf ace , 33 dia s apó s o pla nti o.Palavra s chav e: alelopat ia, Sorghum bicolor , sor gol eon a, Lac tuc a sat iva . ABS TRA CTChe mic al cha rac ter iza tio n and all elo pat hic effects of rad icu lar exu dat es of pla nts of sor ghu m ove r let tuc e lea ves A che mic al ana lys is of the Sor ghu m bic olo r roo t exu dat e lea d to the ide nti fic ati on of the qui non e sor gol eon e 1 and the cor res pon din g dih ydroqu ino ne 2 as the maj or com pon ent s. An in vit ro essa y hav e sho wn tha t at the con cen tra tio n of 20 M thi s exu dat e cau sed a 13. 1% red uct ion on the rad icu lar gro wth of Lac tuc a sat iva L. In a rec ircul ati ng hyd rop oni c cul tur e sys tem , the exu dat e pro duc ed by the roo ts of fou r pla nts of sor ghu m cau sed a 62. 4% red uct ion on the let tuc e lea f are a aft er 33 day s of pla nti ng.Key words : allelo pha thy , Sor ghu m bic olo r, sor gol eon e, Lac tuc a sat iva .
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