Abscisic Acid Elicits the Water-Stress Response in Root Hairs of <i>Arabidopsis thaliana</i>

Schnall, Jennifer A.; Quatrano, Ralph S.

doi:10.1104/pp.100.1.216

Cited by 78 publications

(46 citation statements)

References 20 publications

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“…I GUS expression in the root meristematic zone by exogenous ABA. In addition, ACT?/ GUS was fully active in lateral root primordia, which is consistent with Schnall and Quatrano's (1992) observation that exogenous ABA inhibits Arabidopsis root elongation but does not affect lateral root initiation. Both endogenous and exogenously applied cytokinins are also known to inhibit root growth (Medford et al, 1989;Su and Howell, 1992).…”

Section: Exogenous Hormones Alter the Pattern Of Act7/gus Expressionsupporting

confidence: 76%

The Arabidopsis ACT7 Actin Gene Is Expressed in Rapidly Developing Tissues and Responds to Several External Stimuli

et al. 1996

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ACT7 encodes one of the six distinct and ancient subclasses of actin protein in the complex Arabidopsis actin gene family. We determined the sequence and structure of the Arabidopsis tbaliana ACT7 actin gene and investigated its tissue-specific expression and regulation. The ACT7 mRNA levels varied by 128-fold among severa1 different tissues and organs. The highest levels of ACT7 mRNA were found in rapidly expanding vegetative organs, the lowest in pollen. A translational fusion with the 5 ' end of ACT7 (1.9 kb) joined to the P-glucuronidase reporter gene was strongly and preferentially expressed in all young, developing vegetative tissues of transgenic Arabidopsis plants. ACT7 was the only Arabidopsis actin gene strongly expressed in the hypocotyl and seed coat. Although no p-glucuronidase expression was seen in developing ovules or immature seeds, strong expression was seen in dry seeds and immediately after imbibition in the entire seedling. ACT7was the only Arabidopsis actin gene to respond strongly to auxin, other hormone treatments, light regime, and wounding, and may be the primary actin gene responding to externa1 stimuli. The ACT7 promoter sequence contains a remarkable number of motifs with sequence similarity to putative phytohormone response elements.Cellular morphogenesis in plants is constrained by rigid cell walls that limit expansion, restrict shape, and prevent migration. Thus, morphogenesis is in part a function of asymmetric cell division and expansion. A number of studies have suggested that these processes are controlled by a dynamic cytoskeleton that consists of dozens of interacting proteins and responds to both developmental and environmental cues (Lloyd, 1991). Actin is a major component of the plant cytoskeleton and is thought to be required for correct cell-division plate alignment and synthesis, cellshape determination, cell-polarity establishment, cytoplasmic streaming, organelle movement, and tip growth (Staiger and Schliwa, 1987;Staiger and Lloyd, 1991;Meagher and Williamson, 1994

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Section: Exogenous Hormones Alter the Pattern Of Act7/gus Expressionsupporting

confidence: 76%

The Arabidopsis ACT7 Actin Gene Is Expressed in Rapidly Developing Tissues and Responds to Several External Stimuli

et al. 1996

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“…Previously, a couple of reports had described certain responses of Arabidopsis roots to drought stress. It was reported that, in response to drought, root hairs become bulbous and shortening (Schnall and Quatrano, 1992) or short, tuberized, hairless roots form in soilgrown Arabidopsis (Vartanian et al, 1994). We tried to repeat these observations under our experimental conditions where seedlings were grown on agar plates with low water potential.…”

Section: Root Response To Drought and Osmotic Stressmentioning

confidence: 99%

Identification of Drought Tolerance Determinants by Genetic Analysis of Root Response to Drought Stress and Abscisic Acid

et al. 2006

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Drought stress is a common adverse environmental condition that seriously affects crop productivity worldwide. Due to the complexity of drought as a stress signal, deciphering drought tolerance mechanisms has remained a major challenge to plant biologists. To develop new approaches to study plant drought tolerance, we searched for phenotypes conferred by drought stress and identified the inhibition of lateral root development by drought stress as an adaptive response to the stress. This drought response is partly mediated by the phytohormone abscisic acid. Genetic screens using Arabidopsis (Arabidopsis thaliana) were devised, and drought inhibition of lateral root growth (dig) mutants with altered responses to drought or abscisic acid in lateral root development were isolated. Characterization of these dig mutants revealed that they also exhibit altered drought stress tolerance, indicating that this root response to drought stress is intimately linked to drought adaptation of the entire plant and can be used as a trait to access the elusive drought tolerance machinery. Our study also revealed that multiple mechanisms coexist and together contribute to whole-plant drought tolerance.

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“…Seedling growth of abi3 plants is slightly less sensitive to ABA-inhibition than wild type, but abi1 and abi2 seedling growth is not inhibited by ABA at concentrations resulting in 50-70% inhibition of wild type seedling growth (Finkelstein and Somerville, 1990). This difference is apparent in both shoot and root growth, even at the level of individual root hair elongation (Schnall and Quatrano, 1992). While mutations in ABI3, ABI4 and ABI5 primarily affect gene expression during seed maturation, all three genes are also expressed in vegetative tissues (Finkelstein et al, 1998;Rohde et al, 1999;Finkelstein and Lynch, 2000a) suggesting they may play a role in vegetative ABA response.…”

Section: Seedling Growthmentioning

confidence: 99%

Abscisic Acid Biosynthesis and Response

Finkelstein¹,

Rock

2002

The Arabidopsis Book

191

141

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Abscisic Acid Elicits the Water-Stress Response in Root Hairs of Arabidopsis thaliana

Cited by 78 publications

References 20 publications

The Arabidopsis ACT7 Actin Gene Is Expressed in Rapidly Developing Tissues and Responds to Several External Stimuli

The Arabidopsis ACT7 Actin Gene Is Expressed in Rapidly Developing Tissues and Responds to Several External Stimuli

Identification of Drought Tolerance Determinants by Genetic Analysis of Root Response to Drought Stress and Abscisic Acid

Abscisic Acid Biosynthesis and Response

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