Role of Silica in Plants, Absorption and Deposition of Silica by Four Varieties of Sorghum

Abstract

To study absorption and deposition of silica by four varieties of sorghum, plants were grown in an open field and gathered at regular 3-week intervals throughout the growing season. Silica content of leaf sheaths and leaves of all varieties continuously increased throughout the season. Stems and seeds remained low and constant in silica content. The silica content of roots decreased during the first 3 to 6 weeks; thereafter a slight increase was observed. Generally, roots had a higher silica content than had been expected. There was a considerable variation in rate and amount of silica absorbed by the four varieties. Spur feterita absorbed the most and Dwarf yellow milo the least. Plants resistant to insects or diseases had a higher silica content at most stages than corresponding susceptible varieties.