Abstract
of the roots is increased because of the increased numbers of elements present. Although the hybrid showed a considerable advantage over one parent with respect to size and number of root structures, and a slight advantage over the other parent, the general pattern described above pertains to each line investigated. The anatomical developmental differences among the maize lines studied are expressed not only quantitatively but at different periods in plant development. Furthermore, anatomical features are generally correlated with morphological features. These facts suggest that in addition to whatever physiological factors are involved, structural features of the stems and roots are related to differences in absorption and distribution of radioactive phosphorus as revealed in correlated studies.
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