Biotechnology Gene Functions

Genes	Function	Mutants	Function
PP2C/ ABI1	negative regulator of ABA signaling	abi1-2 / abi1-3	enhanced response to ABA/ limited effect on drought avoidance
PP2C/ ABI2	negative regulator of ABA signaling
PP2CA	negative regulator of ABA signaling	hab1-1	ABA hypersensitive inhibition of seed germination/ enhanced ABA-mediated stomatal closure
PP2C/ HAB1	negative regulator of ABA signaling/ strongly induced by ABA	hab1-1 abi1-2/ hab1-1 abi1-3	strongly increased response to ABA/ stomatal closure/ reduced transcriptional water loss/ reduced water consumption
ABA	response to drought/ salt/ cold stress/ stomatal closure/ changes of ion fluxes and osmoregulation/ affects more than 1000 gene expression under stress	ABA-deficient/ ABA/insensitive	wilty phenotype
FCA	RNA-binding protein: ABA-binding receptor/ flowering control	fca-1	no affect on seed germination/ stomatal response
RPK1	plasma membrane receptor/ ABA signaling	era1/ abh1/fry1/ hab1/sad1/gcr1	ABA hypersensitive
Ca++	ABA signal transduction	abi1-1/ abi1-1 R1 to R7	enhanced response to ABA
cyclic ADP-ribose	ABA signal transduction	ScaBP5 (SOS3-like calcium binding protein 5) mutant	hypersensitive to ABA
reactive oxygen	ABA signal transduction	PKS3 (protein kinase 3) mutant	hypersensitive to ABA
nitric oxide	ABA signal transduction	rbohD/F	reduced ABA sensitivity
phosphoinositide	ABA signal transduction	rpk1	reduced ABA sensitivity
phosphatidic acid	ABA signal transduction	rcn1	reduced ABA sensitivity
sphingosine 1-phosphate	ABA signal transduction	ost1	reduced ABA sensitivity
ABI5/ ABF/AREB/AtBZIP	transcription factors/ ABA responsive element-binding proteins	abi5	reduced ABA sensitivity
ABI3/ VP1/ B3	transcription factors/ domain proteins/ ABA signaling	abi3	reduced ABA sensitivity
ABI4/AP2/ MYC/ MYB/ HD/ZIP	transcription factors/ domain proteins/ ABA signaling	abi4	reduced ABA sensitivity