Basipetal transport of various substances through half-inch stem sections of healthy and aster yellows virus-infected Nicotiana rustica L. var. humilis was determined. The effects of infection by three strains of the virus, dwarf, severe, and Tulelake were observed on the transport of 14C-labeled
The isouition and partial purification of succinyl CoA synthetase from Nicotiana tabacum is described. Enzynio activity had a pH optimum of pH 7.0 and apparent Km values for succinic acid. ATF and MgCl(2) . are 3.5 × 10(-2) 5.7 × 10(-3) and 4.0 × 10(-3) M, respectively. The euzyme is specific in