3 h	seed hydropriming at 20 °C for 3 h
A	α-amylase activity
ABA	abscisic acid
ABA-glc	glucose conjugated abscisic acid
ABS/CSm	energy absorption by antennas
ANOVA	analysis of variance
butenolide	2(5H)-furanone
But 1	seed treatment with 10−6 M butenolide
But 2	seed treatment with 10−5 M butenolide
But 3	seed treatment with 10−4 M butenolide
DA	dehydrogenase activity
das	days after sowing
DIo/CSm	energy dissipation from PSII (energy lost as heat), where CSm is the cross section of the sample
DW	dry weight
EL	electrolyte leakage
ETo/CSm	energy used for electron transport
FW	fresh weigh
IAA	indole-3-acetic acid
KIN	kinetin
PAR	photosynthetic active radiation
PI	performance index of PSII normalised for equal absorption (PI/ABS)
PSII	photosystem II
QA	primary quinone acceptor of PSII
RC/CSm	number of active reaction centres
TRo/CSm	excitation energy trapped in PSII (energy transferred to a reaction centre)
VPD	coefficient of the vegetative phase development
VPDi	index of the vegetative phase development