By: Young, Leigh Ann; Sisler, Edward C.
Dicamba (3,6.dichloro-o-anisic acid) at concentrations of 10-5M and 10-3M accelerated the loss of chlorophyll from tobacco and stimulated ethylene production. CO + + (10-3M) suppressed the production of ethylene at both 105M and 103M dicamba. Co+ + inhibited the accelerated loss of chlorophyll at lO-5M dicamba but not at lO-3M. Ag+ ion and 2,5.norbornadiene. it is concluded that dicamba causes chlorophyll ba but not at 10-3M. Dicamba at lO-5M and 10-4M caused an induction of chlorophyllase which was suppressed by Co++ lon, Ag+ lon, and 2,5.norbornadiene. it is concluded that dicamba causes chlorophyll degradation in part by its ability to stimulate ethylene production and partly by some other unknown means. INTRODUCTION
Dicamba is a substituted benzoic acid herbicide. These herbicides closely resemble the phenoxy auxins in their auxin and herbicidal activity. Dicamba causes tobacco leaves to "yellow" more rapidly than nontreated leaves. After dicamba application, the leaves turn yellow in 4 to 6 days giving the leaves the appearance of being riper than they are.
Dicamba (3,6.dichloro-o-anisic acid) at concentrations of 10-5M and 10-3M accelerated the loss of chlorophyll from tobacco and stimulated ethylene production. CO + + (10-3M) suppressed the production of ethylene at both 105M and 103M dicamba. Co+ + inhibited the accelerated loss of chlorophyll at lO-5M dicamba but not at lO-3M. Ag+ ion and 2,5.norbornadiene. it is concluded that dicamba causes chlorophyll ba but not at 10-3M. Dicamba at lO-5M and 10-4M caused an induction of chlorophyllase which was suppressed by Co++ lon, Ag+ lon, and 2,5.norbornadiene. it is concluded that dicamba causes chlorophyll degradation in part by its ability to stimulate ethylene production and partly by some other unknown means. INTRODUCTION
Dicamba is a substituted benzoic acid herbicide. These herbicides closely resemble the phenoxy auxins in their auxin and herbicidal activity. Dicamba causes tobacco leaves to "yellow" more rapidly than nontreated leaves. After dicamba application, the leaves turn yellow in 4 to 6 days giving the leaves the appearance of being riper than they are.
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