Distribution of Boron in Cells of Dicotyledonous Plants in Relation to Growth.

Abstract

Boron determinations were made on intracellular fractions of mung bean and sunflower separated by differential centrifugation. Mitochondria and "microsomes" were found to be lower in boron content than nuclei, plastids and dialyzed supernatant fractions. The boron of the non-dialyzable supernatant fraction of sunflower did not change in response to decreasing amounts of available boron. The boron content of the dialysable portion of the supernatant fraction, however, declined when supplies of available boron declined and it finally reached zero in this fraction when the plants exhibited pronounced boron deficiency symptoms.