Short Communication Effects of S-Ethyl-N,N-Dipropylthiocarbamate (EPTC) on Normal and Dwarf Seedlings of Zea mays L.

Summary Gibberellin-deficient dwarf maiz, mutane seedlingt ar aest leas tet timen mors sensitive to eEPTC (S-ethyl-N,N-dipropylthiocarbamate phytotoxicit tha norman)y maizel Level. osf reduce d glutathione and the enzyme cytosolis ancd microsoma glutathionl S-transferase (importane in tht e detoxication of th e herbicide ar)e no significantlt differeny in dwart anf d norma maizel Ou. datr a suggest that EPT C phytotoxicit is relatey d to alteration ins gibberelli metabolisn inm maiz plantse . The phvtotoxi modc oef actio on f th e herbicid EPTe C ha oftes been hypothesizen d as being involve idn the regulatio onf photosynthesis th, e metabolis omf lipids protein, s and nuclei acidc (LAVAL-MARTIs et alN 1983. DUTK; anA d KOMIVE 1983S BART; eAt al . 1983; WILKINSO et alN 1977. ASHTO; etN al 1977). Recen. studiest however, indicate, d that EPT alterC gibberellis (GA biosynthesin) (WILKINSOs 1983)N an, reduced thse levels and change ths e distributio of totan anl d endogenou gibberellin-liks substancee s