Table 3.

Crosstalk events associated with serotonin in plant signaling.

Signaling response	Response	Reference
PIN efflux family proteins	Differential expression, SER elicits auxin like action	71,220
Jasmonic acid	Induces JA synthesis, JA mutants [COI 1 and JAR 1) exhibit reduced SER sensitivity	215
Reactive oxygen species	SER induced ROS surge and its differential redistribution in roots	215
Ethylene	Positive regulator for root development. Etr 1 mutant with poor sensitivity to SER	215
Free radical species [ROS, RNS, singlet oxygen]	Induces localized hypersensitive response toward biotic stress	221
Methyl jasmonate [exogenous]	Induces SER biosynthesis genes to overexpress	222
ABA [exogenous]	Induces SER biosynthesis genes to overexpress	222
Biotic stress [aphid infestation]	Induction of Trp decarboxylase gene in response to aphid infestation in leaves	223
Thermal stress	Redistribution of SER in cells accompanied by polar redistribution in root tips	30
Biotic stress	SER mediates insect infestation-mediated defense signaling	179
Plant defense	Activity of SER N-acetyltransferase [SNAT] is essential for downstream MEL accumulation and fungal defense	224
Triggering of flowering and MEL accumulation	Knockout analysis of Arabidopsis SER N-acetyltransferase [SNAT] reveals its role in flowering and MEL accumulation	225
Seed development and organogenesis	RNAi silencing of SER N-acetyltransferase [SNAT] isogenes reduce MEL accumulation and reduce seed development in rice.	226