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  • 2020-Hao Zhou-MRes

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The effects of exogenous monoterpenes on drought response in tomato

Research output: ThesisMaster's Thesis

Unpublished

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The effects of exogenous monoterpenes on drought response in tomato. / Zhou, Hao.
Lancaster University, 2020. 70 p.

Research output: ThesisMaster's Thesis

Harvard

APA

Zhou, H. (2020). The effects of exogenous monoterpenes on drought response in tomato. [Master's Thesis, Lancaster University]. Lancaster University. https://doi.org/10.17635/lancaster/thesis/876

Vancouver

Zhou H. The effects of exogenous monoterpenes on drought response in tomato. Lancaster University, 2020. 70 p. doi: 10.17635/lancaster/thesis/876

Author

Zhou, Hao. / The effects of exogenous monoterpenes on drought response in tomato. Lancaster University, 2020. 70 p.

Bibtex

@mastersthesis{9859ba48760947bf97c6fc837dc812e6,
title = "The effects of exogenous monoterpenes on drought response in tomato",
abstract = "Interactions between biogenic monoterpenes and drought stress remain poorly understood and characterised. Even the nature of the response of biogenic monoterpene emissions to water limitation is controversial, possibly depending on the severity, intensity and duration of the drought. Whether monoterpenes regulate plant physiological response to drought stress is currently unknown. In this research, 6-week-old Ailsa Craig wild-type (WT) and ABA-deficient (notabilis) tomatoes were either well-watered or exposed to deficit irrigation (by watering pots with 25% of daily evapotranspiration) in a factorial combination with selected-monoterpenes applied exogenously as a foliar spray. Both genotypes showed similar physiological and biochemical responses to water deficit. Compared to well-watered controls, drought stress significantly reduced net photosynthesis rate and stomatal conductance, increased hydrogen peroxide (H2O2) and malondialdehyde (MDA) concentrations, and also significantly inhibited PSII maximum (Fv{\textquoteright}/Fm{\textquoteright}) and operating (φPSII) efficiency under severe stress. Drought stress significantly increased foliar abscisic acid (ABA) accumulation in WT plants, whereas notabilis remained ABA-deficient. Applying exogenous monoterpenes decreased net photosynthesis and stomatal conductance of WT plants under moderate drought conditions. Although foliar H2O2 content (a proxy of oxidative stress) was not affected by exogenous monoterpenes, their application significantly decreased the production of MDA (which indicates damage caused by drought-induced oxidative stress). The monoterpene spray also significantly inhibited ABA accumulation under severe stress, possibly by interfering with the methylerythritol (MEP) pathway and thereby reducing production of ABA precursors. Although exogenous monoterpenes increased plant antioxidative capacity by reducing lipid peroxidation, this did not appear to protect photosynthetic activities as the PSII efficiencies or net photosynthesis rate were not affected. That these effects were not observed in notabilis suggests that monoterpenes have ABA-dependent impacts on plant photosynthetic biochemistry.",
keywords = "Biogenic Volatile Organic Compounds (BVOCs), Drought stress, Oxidative Stress, Monoterpenes, Hydrogen Peroxide, Lipid peroxidation, Tomato (Solanum lycopersicum L.)",
author = "Hao Zhou",
year = "2020",
month = feb,
day = "15",
doi = "10.17635/lancaster/thesis/876",
language = "English",
publisher = "Lancaster University",
school = "Lancaster University",

}

RIS

TY - GEN

T1 - The effects of exogenous monoterpenes on drought response in tomato

AU - Zhou, Hao

PY - 2020/2/15

Y1 - 2020/2/15

N2 - Interactions between biogenic monoterpenes and drought stress remain poorly understood and characterised. Even the nature of the response of biogenic monoterpene emissions to water limitation is controversial, possibly depending on the severity, intensity and duration of the drought. Whether monoterpenes regulate plant physiological response to drought stress is currently unknown. In this research, 6-week-old Ailsa Craig wild-type (WT) and ABA-deficient (notabilis) tomatoes were either well-watered or exposed to deficit irrigation (by watering pots with 25% of daily evapotranspiration) in a factorial combination with selected-monoterpenes applied exogenously as a foliar spray. Both genotypes showed similar physiological and biochemical responses to water deficit. Compared to well-watered controls, drought stress significantly reduced net photosynthesis rate and stomatal conductance, increased hydrogen peroxide (H2O2) and malondialdehyde (MDA) concentrations, and also significantly inhibited PSII maximum (Fv’/Fm’) and operating (φPSII) efficiency under severe stress. Drought stress significantly increased foliar abscisic acid (ABA) accumulation in WT plants, whereas notabilis remained ABA-deficient. Applying exogenous monoterpenes decreased net photosynthesis and stomatal conductance of WT plants under moderate drought conditions. Although foliar H2O2 content (a proxy of oxidative stress) was not affected by exogenous monoterpenes, their application significantly decreased the production of MDA (which indicates damage caused by drought-induced oxidative stress). The monoterpene spray also significantly inhibited ABA accumulation under severe stress, possibly by interfering with the methylerythritol (MEP) pathway and thereby reducing production of ABA precursors. Although exogenous monoterpenes increased plant antioxidative capacity by reducing lipid peroxidation, this did not appear to protect photosynthetic activities as the PSII efficiencies or net photosynthesis rate were not affected. That these effects were not observed in notabilis suggests that monoterpenes have ABA-dependent impacts on plant photosynthetic biochemistry.

AB - Interactions between biogenic monoterpenes and drought stress remain poorly understood and characterised. Even the nature of the response of biogenic monoterpene emissions to water limitation is controversial, possibly depending on the severity, intensity and duration of the drought. Whether monoterpenes regulate plant physiological response to drought stress is currently unknown. In this research, 6-week-old Ailsa Craig wild-type (WT) and ABA-deficient (notabilis) tomatoes were either well-watered or exposed to deficit irrigation (by watering pots with 25% of daily evapotranspiration) in a factorial combination with selected-monoterpenes applied exogenously as a foliar spray. Both genotypes showed similar physiological and biochemical responses to water deficit. Compared to well-watered controls, drought stress significantly reduced net photosynthesis rate and stomatal conductance, increased hydrogen peroxide (H2O2) and malondialdehyde (MDA) concentrations, and also significantly inhibited PSII maximum (Fv’/Fm’) and operating (φPSII) efficiency under severe stress. Drought stress significantly increased foliar abscisic acid (ABA) accumulation in WT plants, whereas notabilis remained ABA-deficient. Applying exogenous monoterpenes decreased net photosynthesis and stomatal conductance of WT plants under moderate drought conditions. Although foliar H2O2 content (a proxy of oxidative stress) was not affected by exogenous monoterpenes, their application significantly decreased the production of MDA (which indicates damage caused by drought-induced oxidative stress). The monoterpene spray also significantly inhibited ABA accumulation under severe stress, possibly by interfering with the methylerythritol (MEP) pathway and thereby reducing production of ABA precursors. Although exogenous monoterpenes increased plant antioxidative capacity by reducing lipid peroxidation, this did not appear to protect photosynthetic activities as the PSII efficiencies or net photosynthesis rate were not affected. That these effects were not observed in notabilis suggests that monoterpenes have ABA-dependent impacts on plant photosynthetic biochemistry.

KW - Biogenic Volatile Organic Compounds (BVOCs)

KW - Drought stress

KW - Oxidative Stress

KW - Monoterpenes

KW - Hydrogen Peroxide

KW - Lipid peroxidation

KW - Tomato (Solanum lycopersicum L.)

U2 - 10.17635/lancaster/thesis/876

DO - 10.17635/lancaster/thesis/876

M3 - Master's Thesis

PB - Lancaster University

ER -