Examination of Ontario adapted dry bean varieties for tolerance towards common pathotypes of Soybean Cyst Nematode
Citation
Mcilveen E., Gillard C., Larsen, JL. and Wally OSD. Examination of Ontario adapted dry bean varieties for tolerance towards common pathotypes of Soybean Cyst Nematode (2023) Canadian Pulse Research Workshop, WIndsor, ON, Canada.
Plain language summary
Soybean cyst nematode (Heterodera glycines, SCN) is the most damaging pest on soybean production in North America. SCN has spread throughout soybean producing areas, including heavy infestations in Southern Ontario, that often overlap with dry bean producing areas. SCN can also infect dry beans and cause similar phenotypic symptoms of those observed on soybeans such as reduced plant height, reduction in pod number and seed size. SCN pathotypes (HG types) have been shifting in soybean producing areas largely due to deployment of genetic resistance, in particular plant introduction (PI) 88788 resistance. SCN population virulence is referred to the female index, which is based on the number of cysts seen on the genetic resistance divided by the number of cysts on a susceptible control plant. A female index on PI88788 greater than 10% is considered HG type 2, which is quickly becoming one of the most common HG types in Southern Ontario. We assessed the SCN reaction of Ontario adapted dry bean cultivars of various market classes towards infection towards the most common SCN populations found in these growing regions, HG0 and HG2, grown and inoculated under controlled conditions. The roots soaked to gently remove the soil followed by vigorous rinsing over a fine sieve to collect the cysts. Female index was then calculated for each cultivar, compared to susceptible soybeans and a resistance panel to confirm HG type. Values for individual cultivars and overall market classes were analyzed to determine overall SCN tolerance.
Abstract
Soybean cyst nematode (Heterodera glycines, SCN) is the most damaging pest on soybean production in North America. SCN has spread throughout soybean producing areas, including heavy infestations in Southern Ontario, that often overlap with dry bean producing areas. SCN can also infect dry beans and cause similar phenotypic symptoms of those observed on soybeans such as reduced plant height, reduction in pod number and seed size. SCN pathotypes (HG types) have been shifting in soybean producing areas largely due to deployment of genetic resistance, in particular plant introduction (PI) 88788 resistance. SCN population virulence is referred to the female index, which is based on the number of cysts seen on the genetic resistance divided by the number of cysts on a susceptible control plant. A female index on PI88788 greater than 10% is considered HG type 2, which is quickly becoming one of the most common HG types in Southern Ontario. We assessed the SCN reaction of Ontario adapted dry bean cultivars of various market classes towards infection towards the most common SCN populations found in these growing regions, HG0 and HG2, grown and inoculated under controlled conditions. The roots soaked to gently remove the soil followed by vigorous rinsing over a fine sieve to collect the cysts. Female index was then calculated for each cultivar, compared to susceptible soybeans and a resistance panel to confirm HG type. Values for individual cultivars and overall market classes were analyzed to determine overall SCN tolerance.