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Title: THE INFLUENCE OF SILICON ON COMPONENTS OF RESISTANCE TO RICE BLAST

Author
item SEEBOLD, K - UNIV. OF FLORIDA
item KUCHAREK, T - UNIV. OF FLORIDA
item DATNOFF, L - UNIV. OF FLORIDA
item MARCHETTI, MARCO

Submitted to: Silicon in Agriculture Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 7/1/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The addition of silicon (Si) to Si-deficient soils has been shown to reduce the epidemic rate of blast, caused by Magnaporthe grisea, in blast- susceptible and partially resistant cultivars of rice. Four cultivars of rice with differential susceptibilities to race IB-49 of M. grisea were fertilized with three rates of calcium silicate fertilizer and inoculated with the pathogen to test the effects of Si on the components of resistanc that influence the epidemic rate. The following components of resistance to blast were examined: incubation period, latent period, infection efficiency, lesion size, rate of lesion expansion, diseased leaf area, and number of spores per lesion were reduced. Lesion size and sporulation per lesion were reduced by 30-45 percent at the highest rate of Si. Thus, Si appears to slow the epidemic rate of blast by limiting lesion size and spore production per lesion.