Abstract
ABSTRACT Sucrose is an important carbon source for plant tissue repairing and also a signal involved in defense responses to against insect herbivores. Allocation of sucrose toward to undamaged tissues is an herbivory tolerance mechanism. Sucrose transporters (SUTs) are key factors to control sucrose flow in plants. In this study, herbivory effects caused by rice leaffolder [Cnaphalocrocis medinalis (Guenée)] on OsSUT4 expressions were investigated in rice plants, and the results showed OsSUT4 expression was significantly upregulated by larvae infestation and mechanical wounding. The wounding-induced OsSUT4 expression was not systemically demonstrated in undamaged leaves. The larval chewing-induced OsSUT4 expression was obviously reduced by blocking jasmonic acid (JA) and abscisic acid (ABA) biosynthesis. In addition to JA and ABA, data showed H2O2 generated in wounded tissues also role a signal in the regulatory pathway of herbivore-induced OsSUT4 expressions. Our finding provide insights for further study in signal network of herbivory-induced sucrose translocation.
Highlights
Insect herbivores are one of the serious problems resulting in worldwide crop losses
Herbivory effects caused by rice leaffolder [Cnaphalocrocis medinalis (Guenée)] on OsSUT4 expressions were investigated in rice plants, and the results showed OsSUT4 expression was significantly upregulated by larvae infestation and mechanical wounding
The results showed that the total soluble sugar and sucrose contents of the 3rd leaf of wounded seedlings were decreased after larvae were removed for 24 h compared to that of non-treated seedlings, the difference was not statistically significant (Figure 1)
Summary
Insect herbivores are one of the serious problems resulting in worldwide crop losses. Plant defense against insect pests is an important trait for crop improvement. Wounding causes cell death and water loss at the injured sites, and damaged plants are infected by pathogens through these wounds (Consales et al 2012; Cui et al 2013; Savatin et al 2014). Defense responses and repair mechanisms are important for protecting plants against insect herbivores. Carbohydrates are needed as energy and carbon structure sources to locally repair wounded tissues at injured sites. Quilliam et al (2006) indicated that photosynthetic products accumulated near the injured area of Arabidopsis, implying that wounded sites were strong carbohydrate sinks. Carbohydrate transported away from injured sites and moved to undamaged organs for later growth recovery has been observed in herbivore attacked tobacco (Schwachtje et al 2006)
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