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Plant Cell, Vol. 12, 2033-2046, November 2000, Copyright © 2000, American Society of Plant Physiologists

A Single Amino Acid Difference Distinguishes Resistant and Susceptible Alleles of the Rice Blast Resistance Gene Pi-ta

Gregory T. Bryana, Kun-Sheng Wua, Leonard Farralla, Yulin Jiaa, Howard P. Hersheya, Sean A. McAdamsa, Kristina N. Faulka, Gail K. Donaldsona, Renato Tarchinia, and Barbara Valenta
a DuPont Agricultural Products, P.O. Box 80402, Wilmington, Delaware 19880-0402

Correspondence to: Barbara Valent, barbara.s.valent{at}usa.dupont.com (E-mail), 302-695-4509 (fax)

The rice blast resistance (R) gene Pi-ta mediates gene-for-gene resistance against strains of the fungus Magnaporthe grisea that express avirulent alleles of AVR-Pita. Using a map-based cloning strategy, we cloned Pi-ta, which is linked to the centromere of chromosome 12. Pi-ta encodes a predicted 928–amino acid cytoplasmic receptor with a centrally localized nucleotide binding site. A single-copy gene, Pi-ta shows low constitutive expression in both resistant and susceptible rice. Susceptible rice varieties contain pi-ta– alleles encoding predicted proteins that share a single amino acid difference relative to the Pi-ta resistance protein: serine instead of alanine at position 918. Transient expression in rice cells of a Pi-ta+ R gene together with AVR-Pita+ induces a resistance response. No resistance response is induced in transient assays that use a naturally occurring pi-ta– allele differing only by the serine at position 918. Rice varieties reported to have the linked Pi-ta2 gene contain Pi-ta plus at least one other R gene, potentially explaining the broadened resistance spectrum of Pi-ta2 relative to Pi-ta. Molecular cloning of the AVR-Pita and Pi-ta genes will aid in deployment of R genes for effective genetic control of rice blast disease.




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