USDA-ARS Crop Production and Pest Control Research Unit, MWA, West Lafayette, IN 47907, USA.
J Exp Bot. 2011 Aug;62(13):4521-31. doi: 10.1093/jxb/err160. Epub 2011 Jun 9.
Salivary secretions of neonate Hessian fly larvae initiate a two-way exchange of molecules with their wheat host. Changes in properties of the leaf surface allow larval effectors to enter the plant where they trigger plant processes leading to resistance and delivery of defence molecules, or susceptibility and delivery of nutrients. To increase understanding of the host plant's response, the timing and characteristics of the induced epidermal permeability were investigated. Resistant plant permeability was transient and limited in area, persisting just long enough to deliver defence molecules before gene expression and permeability reverted to pre-infestation levels. The abundance of transcripts for GDSL-motif lipase/hydrolase, thought to contribute to cuticle reorganization and increased permeability, followed the same temporal profile as permeability in resistant plants. In contrast, susceptible plants continued to increase in permeability over time until the entire crown of the plant became a nutrient sink. Permeability increased with higher infestation levels in susceptible but not in resistant plants. The ramifications of induced plant permeability on Hessian fly populations are discussed.
初生黑森瘿蚊幼虫的唾液分泌物与小麦宿主之间开始进行双向分子交换。叶片表面性质的变化使幼虫效应物能够进入植物内部，触发导致抗性和防御分子输送的植物过程，或导致敏感性和养分输送的植物过程。为了增加对寄主植物反应的理解，研究了诱导表皮通透性的时间和特征。抗性植物的通透性是短暂的且面积有限，仅持续足够长的时间来输送防御分子，然后基因表达和通透性恢复到侵染前的水平。被认为有助于角质层重组和通透性增加的 GDSL 基元脂肪酶/水解酶的转录本丰度与抗性植物的通透性呈相同的时间模式。相比之下，易感植物的通透性随着时间的推移持续增加，直到植株的整个冠层都成为养分的汇。在易感植物中，渗透率随侵染水平的升高而升高，但在抗性植物中则不然。讨论了诱导植物通透性对黑森瘿蚊种群的影响。
