The 19 th Annual Environmental Chemistry
نویسنده
چکیده
Insect herbivory induces the production of defensive plant compounds that can poison or reduce the growth of their attackers. Previous studies have shown that plants supplemented with silicon (Si) have increased tolerance to both abiotic and biotic stresses including herbivores. This tolerance has been mainly associated with the accumulation of Si bodies in plant tissues, but the effect of Si on other plant resistant mechanisms has been explored in only a few systems. This study tested the effect of Si supplementation on herbivore-induced defense responses in tomato and corn plants. Si-supplemented plants and their respective controls (without Si) were exposed to herbivory by the fall armyworm (FAW) larvae Spodoptera frugiperda. The plant defense response was tested by counting the density of trichomes and by measuring the activity of two defensive proteins, polyphenol oxidase (PPO) and trypsin proteinase inhibitor (trypsin PI). Our results show that tomato plants supplemented with Si had higher number of glandular trichomes and higher PPO activity when fed upon by the FAW larvae compared with non-supplemented controls. In corn, Si-treated plants also had higher activity of trypsin PI upon FAW feeding but the density of trichomes did not change. We conclude that Si boosts defenses upon insect herbivory in both Si-accumulators and non Si-accumulator plants. Si supplementation may be a promising practice to reduce the use of pesticides in agricultural systems. This research was funded by the Northeast Sustainable Agriculture, Research and Education program (NESARE). A Novel Process for Reclaiming Marketable Raw Materials from Hydraulic Fracturing Wastes Ajemigbitse Moses and Fred Cannon a Civil and Environmental Engineering, Pennsylvania State University *Corresponding author: [email protected]
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تاریخ انتشار 2016