Department of Botany, Ranchi Agricultural College, Bihar.
*Part of Thesis submitted for the Master of Science Degree to the University of Missouri, Columbia, U.S.A. in 1962.
Five soybean crosses were studied to detect any possible linkage of the single dominant gene for resistance with other qualitative and quantitative characters.
Three sources of the allele conditioning resistance were used in this study. One cross, Ralsoy X L6–2132A14, gave some evidence of linkage in the coupling phase between the Phytophthora resistant allele (Ps) and the allele for lateness in maturity (S). In this particular cross, lateness was dominant over earliness.
There was no evidence of any linkage for all the other combinations of plant and seed characteristics used in this study. With the exception of maturity in the cross Ralsoy X L6–2132A14, the present investigations do not indicate any difficulty in using the Ps allele (Phytophthora resistant allele) in breeding work.
