Abscisic acid (ABA) mediates seed maturation and adaptive responses to environmental stress. In Arabidopsis, the ABA-INSENSITIVE1 (ABI1) protein phosphatase 2C is required for proper ABA responsiveness both in seeds and in vegetative tissues.

Arabidopsis thaliana abscisic acid insensitive 1-1 (abi1-1) is a dominant mutant that is insensitive to the inhibition of germination and growth by the plant hormone, abscisic acid (ABA). The mutation severely decreases the catalytic activity of the …

The Arabidopsis ABI1 and ABI2 genes encode two protein serine/threonine phosphatases 2C (PP2C). These genes have been originally identified by the dominant mutations abi1--1 and abi2--1, which reduce the plant's responsiveness to the hormone abscisic acid (ABA).

2003年4月23日 · Arabidopsis thaliana abscisic acid insensitive 1-1 (abi1-1) is a dominant mutant that is insensitive to the inhibition of germination and growth by the plant hormone, abscisic acid (ABA). The mutation severely decreases the catalytic activity of the ABI1 type 2C protein phosphatase (PP2C).

Here, we demonstrate that ABI1, a key component of clade A PP2Cs in ABA signal transduction pathway, directly interacts with the C-terminal R domain of AHA2 and dephosphorylates Thr 947, which decreases PM H + extrusion and negatively regulates primary root …

2001年12月25日 · To assess stomatal insensitivity of the abi1-1 and abi2-1 mutants to ABA, we performed a gas-exchange analysis of ABA response in these mutants versus wild-type Ler plants. The change in conductance was calculated as the change in slope of the conductance versus time graph.

2015年10月20日 · Here, we report that ABI1 (ABA-INSENSITIVE 1) can interact with the U-box E3 ligases PUB12 and PUB13, but is ubiquitinated only when it interacts with ABA receptors in an in vitro assay. A...

Arabidopsis abi1-1 and abi2-1 phosphatase mutations reduce abscisic acid-induced cytoplasmic calcium rises in guard cells. Elevations in cytoplasmic calcium ( [Ca (2)+] (cyt)) are an important component of early abscisic acid (ABA) signal transduction.

2009年10月23日 · Our results reveal the structural basis of the mechanism of (+)-ABA-dependent inhibition of ABI1 by PYL1 in ABA signalling. The phytohormone ABA has central roles in the adaptation of vegetative...

2015年10月20日 · Here, we report that ABI1 (ABA-INSENSITIVE 1) can interact with the U-box E3 ligases PUB12 and PUB13, but is ubiquitinated only when it interacts with ABA receptors in an in vitro assay. A mutant form of ABI1-1 that is unable to interact with PYLs is more stable than the wild-type protein.