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Overexpression of geraniol synthase induces heat stress susceptibility in Nicotiana tabacum
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Overexpression of geraniol synthase induces heat stress susceptibility in Nicotiana tabacum
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Journal Article
Overexpression of geraniol synthase induces heat stress susceptibility in Nicotiana tabacum
2019
Overview
Monoterpene alcohols function in plant survival strategies, but they may cause self-toxicity to plants due to their hydrophobic and highly reactive properties. To explore the role of these compounds in plant stress responses, we assessed transgenic tobacco plants overexpressing the monoterpene alcohol geraniol synthase (GES plants). Growth, morphology and photosynthetic efficiency of GES plants were not significantly different from those of control plants (wild-type and GUS-transformed plants). While GES plants’direct defenses against herbivores or pathogens were similar to those of control plants, their indirect defense (i. e., attracting herbivore enemy Nesidiocoris tenuis) was stronger compared to that of control plants. However, GES plants were susceptible to cold stress and even more susceptible to extreme heat stress (50°C), as shown by decreased levels of sugar metabolites, invertase activity and its products (Glc and Fru), and leaf starch granules. Moreover, GES plants showed decreased transcription levels of the WRKY33 transcription factor gene and an aquaporin gene (PIP2). The results of this study show that GES plants exhibit enhanced indirect defense ability against herbivores, but conversely, GES plants exhibit hypersensitivity to heat stress due to suppressed sugar metabolism and gene regulation for thermal stress tolerance.
Publisher
Springer Science + Business Media,Springer Berlin Heidelberg,Springer Nature B.V
Subject
/ Alcohol
/ Alcohols
/ Arabidopsis Proteins - genetics
/ Arabidopsis Proteins - metabolism
/ Biomedical and Life Sciences
/ cold
/ Ecology
/ Forestry
/ Gene Expression Regulation, Plant
/ genes
/ geraniol
/ leaves
/ Phosphatidylinositol 4,5-diphosphate
/ Phosphoric Monoester Hydrolases - genetics
/ Phosphoric Monoester Hydrolases - metabolism
/ Plants, Genetically Modified - genetics
/ Plants, Genetically Modified - metabolism
/ Starch
/ Sugar
/ sugars
/ Tobacco
/ Toxicity
/ Transcription Factors - genetics
