Feeding behavior explains the different effects of cabbage on MEAM1 and MED cryptic species of Bemisia tabaci

• 来源期刊: 中国昆虫科学（英文版）
• 年，卷（期）: 2020,（6）
• 所属期刊栏目: Original articles
• 页码范围: 1276-1284
• 页数: 9页
• 语种: 英文
• DOI: 10.1111/1744-7917.12739

摘要

MEAM1 (Middle East-Asia Minor 1,"B" biotype) and MED (Mediterranean,"Q" biotype) are the two most destructive cryptic species of the Bemisia tabaci complex on the planet.Our previous studies have shown that MEAM 1 outcompetes MED on cabbage;the underlying mechanism is unknown.In the Brassicaceae family,the glucosinolatemyrosinase defense system plays a crucial role in deterring feeding,inhibiting growth,and causing acute toxicity against a wide range of generalist herbivores.In the present study,we first compared the survival of MEAM 1 and MED exposed to sinigrin (a glucosinolate) and myrosinase (an enzyme that degrades glucosinolates);we found that survival of both species was high in response to sinigrin alone but was near zero in response to sinigrin + myrosinase.We then used electropenetrography (electrical penetration graphs,EPG) to assess the feeding behaviors of MEAM1 and MED whiteflies on cabbage.The EPG results revealed that the mean duration of each potential drop (pd,indicating an intracellular puncture) was substantially longer for MED than MEAM 1 on cabbage,indicating that the exposure to the toxic hydrolysates of glucosinolate and myrosinase is greater for MED than for MEAM1.We therefore conclude that differences in penetrating behaviors may help explain the different effects of cabbage on MEAM1 and MED whitefly species.