Related Experiment Video
Updated: Feb 11, 2026

Blast Quantification Using Hopkinson Pressure Bars
Published on: July 5, 2016
Functional Interactions Between Major Rice Blast Resistance Genes, Pi-ta and Pi-b, and Minor Blast Resistance
Xinglong Chen1, Yulin Jia1, Melissa H Jia1
1First and sixth authors: Department of Plant Pathology, China Agricultural University, Beijing, China 100193; and first, second, third, fourth, and fifth authors: U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Dale Bumpers National Rice Research Center (DB NRRC), Stuttgart, AR 72160.
Abstract:
Major blast resistance (R) genes confer resistance in a gene-for-gene manner. However, little information is available on interactions between R genes. In this study, interactions between two rice blast R genes, Pi-ta and Pi-b, and other minor blast resistance quantitative trait loci (QTLs) were investigated in a recombinant inbred line (RIL) population comprising 243 RILs from a Cybonnet (CYBT) × Saber (SB) cross. CYBT has the R gene Pi-ta and SB has Pi-b. Ten differential isolates of four Magnaporthe oryzae races (IB-1, IB-17, IB-49, and IE-1K) were used to evaluate disease reactions of the 243 RILs under greenhouse conditions. Five resistance QTLs were mapped on chromosomes 2, 3, 8, 9, and 12 with a linkage map of 179 single nucleotide polymorphism markers. Among them, qBR12 (Q1), was mapped at the Pi-ta locus and accounted for 45.41% of phenotypic variation while qBR2 (Q2) was located at the Pi-b locus and accounted for 24.81% of disease reactions. The additive-by-additive epistatic interaction between Q1 (Pi-ta) and Q2 (Pi-b) was detected; they can enhance the disease resistance by an additive 0.93 using the 0 to 9 standard phenotyping method. These results suggest that Pi-ta interacts synergistically with Pi-b.
More Related Videos
Related Concept Videos
The Buckingham Pi Theorem
Determination of Pi Terms
The theorem indicates that the...
PI Controller: Design
Polygenic Traits
Resistivity
Resistance

