Studies on selective herbicide, CMMP (solan) III

A consideration on the mode of action of CMMP

Abstract

A study was conducted to obtain some informations on the mode of action of CMMP (solan).
(1) First of all, 50% inhibitive concentrations of CMMP on fresh weight of several kinds of plant were investigated.
It appeared that Japanese honewort was the most resistant of all plants tested. Descending order was as follows: Japanese honewort (9.5%)>carrot (6.1%)>tomato (2.5%)>egg plant (0.08%)> tobacco (0.04%).
(2) Referring to above result, Hill reaction and cyclic or non cyclic photophosphorylation were investigated on several kinds of plants. In consequence, both of susceptible and resistant plants for CMMP were inhibited of Hill reaction and photophosphorylation.
(3) Therefore it can not be considered that the selectivity of CMMP is caused by different actions on cyclic photophosphorylation.
For this reason, the cosideration on selective action of this herbicide reported by COLBY is denied.
(4) Chloroplast in guard cell was observed in detail after spraying with CMMP. In CMMP susceptible plants, chloroplast disappeared by destructing (as if melting) day by day and in resistant plants it was as same as the check.
(5) In cosequence, sclective action of CMMP might be caused by resistant activity for chloroplast destruction of this herbicide.