Exogén SA kezelések fényben és sötétben történő hatásának összehasonlító elemzése vad típusú és etilén receptor mutáns, Never-ripe paradicsom növények leveleiben

Abstract

Biotic stresses is caused in plants due to damage instigated by other organisms, like insects, disease (fungal, bacterial, and viral), which are major limitations to crop yield. The cellular response to biotic stress is an oxidative and nitrosative burst involving production of reactive oxygen species (ROS) and nitric oxide (NO). Salicylic acid (SA) is a natural phenolic compound, which accumulates under biotic stress and controls physiological and biochemical functions in plants. SA plays an important role in oxidative and nitrosative stress by modulating the activity of some antioxidant enzymes. Polyamines (PAs) are low molecular weight organic compounds acting as signal molecules by directly or indirectly involved in the biotic stress response pathway. The metabolism of PAs is regulated not just by SA but also by the gaseous phytohormone ethylene (ET), which is a key regulator in plant growth and developmental process as well as biotic stress response. Furthermore, ET and PAs may be an antagonistic relationship because they share a common biosynthetic precursor. However, plant immune defence also depends on the environmental factors such as light. Excess of light energy under stress conditions leads to oxidative stress, which may contribute to the initiation of cell death in tissues.