关键词: 白背飞虱, 水稻品种, 取食行为, 抗性, 刺吸电位技术

Abstract: 【Aim】 To elucidate the resistance mechanisms of different rice varieties (i.e., Fengyuanyou 272, R9810-T, Huahuiyihao, Minghui 63, Manuogu and Rathu Heenati) against the white-backed planthopper, Sogatella furcifera. 【Methods】 Electronic penetration graph (EPG) was used to record the feeding behavior of S. furcifera on the seedlings of these six rice varieties at the 3rd leaf stage. Nine non-phloem variables and 22 phloem variables based on typical EPG waveforms were considered in the analysis. 【Results】 During 8 h recordings, the total time of non-penetration waveform (np) on Rathu Heenati was the longest , followed by that on Manuogu, their total time of np had significant difference, and both of them were significantly longer than that on the other four varieties (P<0.05). The total time of pathway waveform (Nc) on Rathu Heenati (8 523.41 s) was 1.24 times longer than that on susceptible variety Minghui 63. S. furcifera spent significantly less time on Rathu Heenati for phloem sap ingestion (N4-b) than other varieties. All the EPG variables on Huahuiyihao or R9810-T had no significant difference from those of susceptible variety Minghui 63 (P≥0.05). Longer average duration of watery salivation (N4-a) followed by long time of sap ingestion was recorded on Fengyuanyou 272. 【Conclusion】 It was inferred that antixenosis components and resistance factors out of or in the phloem region might prevent this insect pest from feeding on Rathu Heenati. Only antixenosis components might restrict S. furcifera to feed on Manuogu. However, Huahuiyihao and R9810-T might not possess obvious resistance to S. furcifera, and Fengyuanyou 272 might be a more susceptible variety than Minghui 63. Combined with the correlation between feeding behavior of insect vector and transmission of persistent plant viruses, these results also provide some information for control of Southern rice black-streaked dwarf virus (SRBSDV) by using S. furcifera-resistant rice varieties.

Key words: Sogatella furcifera, rice varieties, feeding behavior, resistance, electronic penetration graph (EPG)