Exogenous ABA promotes resistance to Sitobion avenae (Fabricius) in rice seedlings

Abstract

BackgroundOver the course of evolution, plants have developed various sophisticated defense mechanisms to resist pests and diseases. The phytohormone abscisic acid (ABA) has an important role in the growth and development of plants and confers tolerance to selected abiotic stressors, such as drought. Prior studies have shown that ABA promotes the deposit of callose in response to piercing/sucking insect pests. The English grain aphid, Sitobion avenae Fabricius, causes huge losses in rice and is especially harmful to rice seedlings.ResultsExogenous ABA promoted growth and reduced the feeding behavior of S. avenae nymphs in rice. Our results suggested that enhanced trichome density and increased expression of related genes may be associated with rice resistance to aphids. An analysis of volatiles revealed the production of seven compounds associated with pest resistance.ConclusionThese results indicate that ABA reduces aphid feeding in rice. Our findings provide a basis for understanding ABA‐mediated defense responses in rice and provide insights on more environmentally‐friendly approaches to control.