Zhongxian Lu, Xiaochan He and Hongxing Xu
Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences (ZAAS), Hangzhou, PR China
In Zhejiang province, China rice crops are often infested with the rice black streak dwarf virus (RBSDV) transmitted by the small brown planthopper (sBPH), Laodelphax striatellus. These infected plants are usually stunted, have more tillers and darker green leaves. The RBSDV and the sBPH have multiple hosts that include maize, barley and wheat which act as source to perpetuate transmission in China.
We found that the brown planthopper (BPH), which is not a vector of the virus, survives better on RBSDV infected plants. BPH on the infected plants have significantly higher nymphal survival rates, heavier and higher egg hatchability (See Table 1).
Table 1: Comparison of fitness characters of BPH reared on healthy and virus infected rice plants under 28C, 12D:12L.
|Nymphal survival (%)||85.9||95.6||0.025|
|Weight of adults (mg/female)||1.28||1.53||0.003|
|Egg hatchability (%)||56.4||89.4||0.002|
Since in Zhejiang province there is usually high RBSDV infected plants in the first crop of hybrid rice, these virus infected plants can make further contributions towards the increase of BPH in the later season. A reason for BPH to have higher fitness is possibly the higher nitrogen accumulation in the leaves of the diseased plants. This is being investigated in ZAAS.