Silicon content of the rice plant as a factor influencing its resistance to infection by the blast fungus, Piricularia oryzae

Volk, R.J.; Kahn, R.P.; Weintraub, R.L.

Phytopathology 48(4): 179-184

1958


ISSN/ISBN: 0031-949X
Accession: 025455150

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Abstract
A quantitative study has been made of the relationship between the silicon content of leaves of Caloro rice and their susceptibility to infection by Piricularia oryzae Cav. Silicon content and susceptibility are related inversely. The susceptibility of each leaf is greatest as it emerges; with advancing age the susceptibility diminishes until virtually complete resistance is attained. Both the silicon content and the degree of susceptibility of the leaf at any moment are related to the amount of silicate available to the roots. It is hypothesized that the silicon combines with 1 or more components of the cell wall to form a complex relatively resistant to attack by the extracellular enzymes of Piricularla, and so diminishes hyphal penetration into the leaf.