Abstract
The soybean cyst nematode (SCN), Heterodera glycines, is a serious economic threat to soybean-producing regions worldwide. A new SCN population (called race X12) was detected in Shanxi province, China. Race X12 could reproduce on all the indicator lines of both race and Heterodera glycines (HG) type tests. The average number of females on Lee68 (susceptible control) was 171.40 with the lowest Female Index (FI) 61.31 on PI88788 and the highest FI 117.32 on Pickett in the race test. The average number of females on Lee68 was 323.17 with the lowest FI 44.18 on PI88788 and the highest FI 97.83 on PI548316 in the HG type test. ZDD2315 and ZDD24656 are elite resistant germplasms in China. ZDD2315 is highly resistant to race 4, the strongest infection race in the 16 races with FI 1.51 while being highly sensitive to race X12 with FI 64.32. ZDD24656, a variety derived from PI437654 and ZDD2315, is highly resistant to race 1 and race 2. ZDD24656 is highly sensitive to race X12 with FI 99.12. Morphological and molecular studies of J2 and cysts confirmed the population as the SCN H. glycines. This is a new SCN race with stronger virulence than that of race 4 and is a potential threat to soybean production in China.
Highlights
The soybean cyst nematode (SCN), Heterodera glycines, is a serious economic threat to soybean-producing regions worldwide
Virulence evaluation of race X12 using race and Heterodera glycines (HG) type tests: To show the virulence of race X12, we evaluated it with indicator lines of both race and HG type tests
A new race of SCN H. glycines: Race X12, was detected in a soybean field heavily infected with SCN in Shanxi province, China, during our survey on the diversity and distribution of H. glycines races in the Huang-Huai Rivers Valley (Lian et al, 2006)
Summary
The soybean cyst nematode (SCN), Heterodera glycines, is a serious economic threat to soybean-producing regions worldwide. Morphological and molecular studies of J2 and cysts confirmed the population as the SCN H. glycines. This is a new SCN race with stronger virulence than that of race 4 and is a potential threat to soybean production in China. ZDD2315 is an elite resistant germplasm in China with few SCN populations parasitizing on it. ZDD2315 is highly resistant to race 4, the strongest infection race while susceptible to race X12 This indicates that race X12 is a new race with some new virulent genes which makes it different from race 4. Some other elite resistant lines, such as ZDD2315 and ZDD24656, were used to test the virulence of race X12. The results of this article may be helpful for navigating the use of resistance in soybean breeding programs and the future control of the SCN population
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