Table I.

ABA biosynthesis mutants with position of the lesions in the pathway and functions of the wild-type proteins

MutantSpeciesBiochemical StepEnzymeReferences
aba1/npq2/los6 1-a ArabidopsisEpoxidation of zeaxanthinZeaxanthin epoxidase (ZEP) Karssen et al. (1983); Rock and Zeevaart (1991a); Niyogi et al. (1998); Xiong et al. (2002)
aba2 Nicotiana plumbaginifolia Epoxidation of zeaxanthinZEP Marin et al. (1996)
osaba1 Rice (Oryza sativa)Epoxidation of zeaxanthinZEP Agrawal et al. (2001)
vp14 Maize (Zea mays)Oxidative cleavage of neoxanthin or violaxanthinNCED Schwartz et al. (1997b); Tan et al. (1997)
not(notabilis)Tomato (Lycopersicon esculentum)Oxidative cleavage of neoxanthin or violaxanthinNCED Burbidge et al. (1999)
aba2/gin1/isi4/sis4 ArabidopsisOxidation of xanthoxin to abscisic aldehydeShort-chain alcohol dehydrogenase Léon-Kloosterziel et al. (1996); Schwartz et al. (1997a); Laby et al., 2000; Rook et al. (2001); Cheng et al. (2002)
flc TomatoOxidation of abscisic aldehyde to ABAMolybdenum cofactor (MoCo) sulfurase Sagi et al. (2002)
aba3/los5/gin5 ArabidopsisOxidation of abscisic aldehyde to ABAMoCo sulfurase Léon-Kloosterziel et al., (1996); Schwartz et al. (1997a); Xiong et al. (2001); Cheng et al. (2002)
sit TomatoOxidation of abscisic aldehyde to ABAAldehyde oxidase Okamoto et al. (2002)
aba1 N. plumbaginifolia Oxidation of abscisic aldehyde to ABAMoCo sulfurase? Akaba et al. (1998)
nar2A Barley (Hordeum vulgare)Oxidation of abscisic aldehyde to ABAMoCo synthesis Walker-Simmons et al. (1989)
aao3 ArabidopsisOxidation of abscisic aldehyde to ABAAbscisic aldehyde oxidase (AAO3) Seo et al. (2000b)
  • F1-a In several cases, allelic mutants that were isolated by different laboratories have been assigned different gene symbols.