Strain-Dependent Temperature-Sensitive Phase in Crown Gall Tumorigenesis

Publisher Website
Google Scholar
Abstract
The effect of high temperature treatments on the early stages of crown gall tumorigenesis in sunflowers was investigated. Treatments of 32 C initiated at various times during the first ten days after infection had a similar effect on tumors induced by Agrobacterium tumefaciens strains B6 and C58. Tumor growth was sensitive to 32 C until 60 to 72 hours after infection and was stimulated by 32 C after that time. Therefore, the “inception phase” for both C58 and B6-induced tumors ends between 60 to 72 hours after infection. In contrast, B6 and C58 tumors varied in their response to 37 C treatments during the first 168 hours after infection. Both C58 and B6 tumors were sensitive to 37 C during the first 72 hours; however, B6 tumors became resistant to 37 C after 96 hours, whereas C58-induced tumors remained sensitive until 144 to 168 hours after infection.