A Comparison of the Boron Requirements of Intact Tomato Plants and Excised Tomato Roots grown in Sterile Culture

A method is described by which boron deficiency in excised tomatoroots was obtained. Lack of boron caused complete inhibitionof growth after three days in sterile culture. The boron concentrationsupporting 50 per cent of the maximum root-growth response issimilar to that giving a 50 per cent growth response with intactplants of the same variety. These results are discussed withregard to the function of boron in plant growth.