Hubei Engineering Research Center for Pest Forewarning and Management, College of Agriculture, Yangtze University, Jingzhou, Hubei, China.
Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China.
J Econ Entomol. 2019 Dec 9;112(6):2790-2796. doi: 10.1093/jee/toz199.
Tomato yellow leaf curl virus (TYLCV), a begomovirus (genus Begomovirus) is the causal agent of tomato yellow leaf curl disease (TYLCD), which causes severe damage to tomato (Solanum lycopersicum) crops throughout tropical and subtropical regions of the world. TYLCV is transmitted by the whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) in a circulative and persistent manner. Our previous studies showed that tomato flavonoids deter B. tabaci oviposition, but the effects of tomato flavonoids on the settling and feeding behavior of B. tabaci and on its transmission of TYLCV are unknown. Using two near-isogenic tomato lines that differ greatly in flavonoid levels, we found that high flavonoid production in tomato deterred the landing and settling of B. tabaci. Moreover, electrical penetration graph studies indicated that high flavonoid levels in tomato reduced B. tabaci probing and phloem-feeding efficiency. As a consequence, high flavonoid levels in tomato reduced the primary and secondary spread of TYLCV. The results indicate that tomato flavonoids provide antixenosis resistance against B. tabaci and that the breeding of such resistance in new varieties could enhance TYLCD management.
番茄黄曲叶病毒（TYLCV），是双生病毒科（Begomovirus）的番茄黄曲叶病毒属（Begomovirus）的成员，是引起番茄黄曲叶病（TYLCD）的病原体，该病害会对全世界热带和亚热带地区的番茄（Solanum lycopersicum）作物造成严重损害。TYLCV 通过粉虱烟粉虱（Bemisia tabaci）（半翅目：粉虱科）以循回和持久的方式传播。我们之前的研究表明，番茄类黄酮可以阻止烟粉虱产卵，但番茄类黄酮对烟粉虱的着落和取食行为及其传播 TYLCV 的影响尚不清楚。利用在类黄酮水平上差异很大的两个近等基因番茄品系，我们发现番茄中类黄酮的大量产生会阻止烟粉虱的降落和着落。此外，电穿透图研究表明，番茄中类黄酮水平的升高降低了烟粉虱的探测和韧皮部取食效率。因此，番茄中类黄酮水平的升高降低了 TYLCV 的初次和再次传播。结果表明，番茄类黄酮为烟粉虱提供了抗生性抗性，在新品种中培育这种抗性可以增强 TYLCD 管理。
