Expedited delivery of Phytophthora QTL and how they impact yield;
Anne Dorrance ( The Ohio State University) ($264030). The Project Manager's email is firstname.lastname@example.org.
Key Words: Phytophthora sojae, Phytophthora Root Rot
Phytophthora sojae is the most prominent root pathogen of soybeans produced under saturated soil conditions, including irrigation. If a cultivar with no or little resistance is planted, the results can be greater than 50% yield loss. This proposal focuses on partial resistance (field resistance also formerly known as tolerance) which is more durable than Rps genes and will provide protection to soybeans even when the Rps genes are not effective to some P. sojae populations. This team is completing a large QTL mapping project where QTLs will be mapped in 8 of 9 sources of partial resistance. For this study, we are proposing to: • Continue to identify better sources of partial resistance; • Fine map the QTLs previously identified and transfer these QTLs into high yielding adapted soybean germplasm in Maturity Groups (MGs) II; • Develop QTLs to determine which of these loci have the most consistent expression across environments; and • Perform functional analysis of the genes underlying the QTLs to determine which genes are the key contributors to the expression of this resistance. These four goals will contribute to our basic understanding of how this resistance functions in soybeans but will also expedite the development of varieties and elite germplasm with high levels of partial resistance to P. sojae and therefore reduce losses realized by the producer.
This project is funded by United Soybean Board