1-qL	The fraction of closed PSII reaction centres based on the “lake” model
1O2	Singlet oxygen
3chl	Triplet state of chlorophyll
Fm′	Maximum chlorophyll a fluorescence in the light-adapted leaf
Fo	Minimum chlorophyll a fluorescence in the dark-adapted leaf
Fo′	Minimum chlorophyll a fluorescence in the light-adapted leaf
Fs	Steady-state photosynthesis
Fv′/Fm′	Efficiency of the open PSII reaction centers
Fv/Fm	Maximum efficiency of PSII photochemistry
Fv/Fo	Efficiency of the oxygen-evolving complex on the donor side of PSII
GLI	Growth light intensity
H2O2	Hydrogen peroxide
HIPVs	Herbivore-induced plant volatiles
HLI	High light intensity
L3	Third-instar larvae
LHCII	Light-harvesting complexes of PSII
MDS	Mildly drought-stressed
NPQ	Non-photochemical quenching (dissipation of excitation energy as heat)
O2•−	Superoxide anion radical
OEC	Oxygen-evolving complex
PPFD	Photosynthetic photon flux density
PSII	Photosystem II
QA	Quinone A
qp	Photochemical quenching (fraction of open PSII reaction centers representing also the redox state of quinone A)
RCs	Reaction centers
ROS	Reactive oxygen species
SDs	Standard deviations
SPs	Saturating pulses
VOCs	Volatile organic compounds
WW	Well-watered
ΦNO	Quantum yield of non-regulated energy loss in PSII
ΦNPQ	Quantum yield of regulated non-photochemical energy loss in PSII
ΦPSII	Effective quantum yield of PSII photochemistry