| Popis: |
Diethylaminoethanol (DAE), a neutralizing amine used to prevent corrosion of steam condensate lines, was found to cause chlorosis in young leaves of chrysanthemum, tomato, corn and bean. Sensitivity of corn and chrysanthemum to DAE was cultivar-dependent; chrysanthemum cultivar ‘Indianapolis White’ was sensitive to low concentrations of DAE, while ‘Bonnie Jean’, ‘Velvet Ridge’ and ‘Mistletoe’ were less so, and corn ‘3XD50’ was sensitive to DAE while ‘Ohio 28’ was not. The presence of latent chrysanthemum chlorotic mottle viroid (ChCMV-L) increased the sensitivity of ‘Bonnie Jean’ and ‘Velvet Ridge’ to DAE. Infection of tomatoes with mild or severe strains of potato spindle tuber viroid (PSTV) resulted in increased sensitivity to DAE under conditions of environmental stress. Leaves of chrysanthemum exhibiting DAE-induced chlorosis contained higher, but nontoxic, levels of iron and other minerals than those from non-DAE-treated plants. The importance of the presence of DAE in steam-treated growth media and steam-generated humidity is discussed. |
