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MAPPING GENE FOR BACTERIAL BLIGHT (RPG4 LOCUS) IN SOYBEAN

FARHATULLAH^1*, ROBIN W. GROOSE², RAZIUDDIN¹, M. AKMAL¹ AND MIAN INAYATULLAH¹

Abstract: Rpg4 gene in soybean. Rpg4 also confers resistance to Pseudomonas syrinagae pv. tomato strains expressing the avirulence gene-avrD. The genetic linkage studies reported here were undertaken to advance the construction of the classical genetic map of soybean. Hybridizations were made in the green house and the F₂ generation was produced and classified. Data were tested by chi-square for single-factor segregation and recombination estimates were computed with computer program, Linkage-1. The Rpg4 locus is controlling bacterial blight resistance to Pseudomonas syrinagae pv. glycinea race 4 segregated independently of the y12, y23, fr1, y13, pb, y9, fr2, Fr3, w1, w4 and y10. The chi-square for the Rpg4 and y9 indicated linkage. The recombination frequency between the Rpg4 and y9 loci was estimated at 29.2 + 8.5 cM.

¹KP Agricultural University, Peshawar, Pakistan

²University of Wyoming, Laramie, USA

^*Corresponding author: e-mail: aliawaisj@hotmail.com