Sequential analysis of nuclei transformation in stem nodulation sites ofSesbania rostrata Bbem (Leguminosae) during infection by specificrhizobium

This paper is a sequential analysis of qualitative and quantitative nuclear evolution inSesbania rostrata (Leguminosae) stem nodules. Before infection, the nuclei of the root primordia (nodulation site) cells show a 2G level of DNA. Immediately upon infection, the cells cease their mitotic activity and the nuclei begin synthesizing DNA up to a 32C level after the onset of the infection. The increase in the diameter of the nuclei of the infected cells is concomitant with the rise in the level of DKA. In the final phase of the evolution of these nodules, the nuclei of the infected cells undergo degenerative changes.