The Effect of Boron Deficiency on Callose Formation and 14c Translocation in Bean (Phaseolus Vulgaris L.) and Cotton (Gossypium Hirsutum L.)

Callose accumulated in the tissues of boron deficient bean and cotton plants, the extent and distribution of which depended on the species. Sieve plates in the phloem of boron deficient bean were characterized by heavy plugs of callose, while the sieve plates of boron deficient cotton were essentially unaffected. Translocation of 14C was, however, drastically reduced in both plants. It is suggested that callose deposition in boron deficient plants is a secondary effect of cellular damage.