Abnormal stomatal behavior and root resistance, and hormonal imbalance in three wilty mutants of tomato

Tal, Moshe; Nevo, Yoram

doi:10.1007/bf00486182

Cited by 137 publications

(79 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the wild-type levels of ABA were substantially lower in Pk fruit than they were in leaves, regardless of the developmental stage. Furthermore, leaf ABA levels were lower in sit(RR) than in flc(RR), and lower in flc(AC) than in not(AC), as was previously reported (Tal and Nevo, 1973;Taylor and Tarr, 1984). Plant growth was generally reduced in the ABA-deficient plants (Supplemental Fig.…”

Section: Aba Deficiency Leads To a Reduction In Plant And Organ Sizesupporting

confidence: 77%

“…1) and that the severity of the shoot phenotypes of the ABA mutants has been correlated with the magnitude of ABA reduction (Tal and Nevo, 1973;Taylor and Tarr, 1984). This apparent contradiction suggests that cuticle formation in fruits is less correlated with ABA levels than it is in leaves, and indeed, the levels of ABA in Pk stage fruits were substantially lower than those of leaves.…”

Section: Aba Deficiency Has Distinctly Different Effects On Tomato Frmentioning

confidence: 99%

“…The mutation in sitiens (sit) affects an aldehyde oxidase that catalyzes the last step of the ABA synthesis pathway (Harrison et al, 2011), while flacca (flc) has a mutation in a molybdenum cofactor sulfurase that is required for the activation by sulfuration of the molybdenum cofactor of aldehyde oxidase (Sagi et al, 2002). The severity of the phenotypes of these mutants correlates with the ABA concentrations in shoots of the 5-week-old plants: not has the mildest phenotype and the highest level of ABA, while sit has the most severe phenotype and the lowest ABA levels (Tal and Nevo, 1973;Taylor and Tarr, 1984).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Cuticle Biosynthesis in Tomato Leaves Is Developmentally Regulated by Abscisic Acid

et al. 2017

View full text Add to dashboard Cite

The expansion of aerial organs in plants is coupled with the synthesis and deposition of a hydrophobic cuticle, composed of cutin and waxes, which is critically important in limiting water loss. While the abiotic stress-related hormone abscisic acid (ABA) is known to up-regulate wax accumulation in response to drought, the hormonal regulation of cuticle biosynthesis during organ ontogeny is poorly understood. To address the hypothesis that ABA also mediates cuticle formation during organ development, we assessed the effect of ABA deficiency on cuticle formation in three ABA biosynthesis-impaired tomato mutants. The mutant leaf cuticles were thinner, had structural abnormalities, and had a substantial reduction in levels of cutin. ABA deficiency also consistently resulted in differences in the composition of leaf cutin and cuticular waxes. Exogenous application of ABA partially rescued these phenotypes, confirming that they were a consequence of reduced ABA levels. The ABA mutants also showed reduced expression of genes involved in cutin or wax formation. This difference was again countered by exogenous ABA, further indicating regulation of cuticle biosynthesis by ABA. The fruit cuticles were affected differently by the ABA-associated mutations, but in general were thicker. However, no structural abnormalities were observed, and the cutin and wax compositions were less affected than in leaf cuticles, suggesting that ABA action influences cuticle formation in an organdependent manner. These results suggest dual roles for ABA in regulating leaf cuticle formation: one that is fundamentally associated with leaf expansion, independent of abiotic stress, and another that is drought induced.

show abstract

Section: Aba Deficiency Leads To a Reduction In Plant And Organ Sizesupporting

confidence: 77%

Section: Aba Deficiency Has Distinctly Different Effects On Tomato Frmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Cuticle Biosynthesis in Tomato Leaves Is Developmentally Regulated by Abscisic Acid

et al. 2017

View full text Add to dashboard Cite

show abstract

“…This results from high stomatal conductance and has also been shown to involve decreased root hydraulic conductance. These effects can also be prevented by applying ABA (Imber & Tal 1970;Tal & Nevo 1973;Koornneef et al 1982;Bradford 1983). Accordingly, the inhibited shoot growth of ABAdeficient mutants of tomato and Arabidopsis has been attributed to shoot water deficits (Bradford 1983;Neill, McGaw & Horgan 1986;Nagel, Konings & Lambers 1994;Léon-Kloosterziel et al 1996).…”

Section: Reassessment Of the Role Of Aba In Shoot Growth Of Tomato Anmentioning

confidence: 99%

Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Sharp

2002

Plant Cell & Environment

409

248

View full text Add to dashboard Cite

Shoot and root growth are differentially sensitive to water stress. Interest in the involvement of hormones in regulating these responses has focused on abscisic acid (ABA) because it accumulates in shoot and root tissues under water-limited conditions, and because it usually inhibits growth when applied to well-watered plants. However, the effects of ABA can differ in stressed and non-stressed plants, and it is therefore advantageous to manipulate endogenous ABA levels under water-stressed conditions. Studies utilizing ABA-deficient mutants and inhibitors of ABA synthesis to decrease endogenous ABA levels, and experimental strategies to circumvent variation in plant water status with ABA deficiency, are changing the view of the role of ABA from the traditional idea that the hormone is generally involved in growth inhibition. In particular, studies of several species indicate that an important role of endogenous ABA is to limit ethylene production, and that as a result of this interaction ABA may often function to maintain rather than inhibit shoot and root growth. Despite early speculation that interaction between these hormones may influence many of the effects of water deficit, this topic has received little attention until recently.

show abstract

“…The wilty phenotype expressed by ABA-deficient mutants was considered to be at least partially the consequence of increased resistance to water movement in the roots (Tal and Nevo, 1973;Nagel et al, 1994). Treatment of the roots with ABA resulted in a reversion of the mutant phenotype back to the wild type in conjunction with an increase in plant hydraulic conductance.…”

Section: Dlscusslonmentioning

confidence: 99%

NaCI Reduces Indole-3-Acetic Acid Levels in the Roots of Tomato Plants Independent of Stress-Induced Abscisic Acid

Dunlap¹,

Binzel²

1996

Plant Physiology

View full text Add to dashboard Cite

Indole-3-acetic acid (IAA) was measured in leaves and roots of tomato (Lycopersicon esculentum) genotypes subjected to salt stress. An abscisic acid (ABA)-deficient mutant of tomato (sitiens), the genetic parent (Rheinlands Ruhm, RR), and a commercial variety (Large Cherry Red, LCR) of tomato were treated with 50 to 300 mM NaCl in nutrient culture. Both LCR and RR had significantly higher levels of IAA in the roots compared with that in sitiens prior to treatment. The initial levels of IAA in the roots of LCR and RR declined by nearly 75% after exposure to NaCl, whereas those in roots from the sitiens mutant remained unchanged. IAA levels in the leaves of all genotypes remained unchanged or increased slightly in response to NaCl. ABA was highest in leaves from the normal genotypes after exposure to NaCl. ABA levels in the roots of sitiens were similar to the levels in the normal genotypes, whereas levels in the leaves were only 10% of the levels found in normal genotypes regardless of the salt treatment. Treatment of LCR and sitiens with exogenous ABA increased the ABA levels in leaves and roots, but there were no measurable changes in endogenous IAA. Therefore, the reduction in IAA appears to result from an ABA-independent effect of NaCl on IAA metabolism in the roots of stressed plants.

show abstract

Abnormal stomatal behavior and root resistance, and hormonal imbalance in three wilty mutants of tomato

Cited by 137 publications

References 29 publications

Cuticle Biosynthesis in Tomato Leaves Is Developmentally Regulated by Abscisic Acid

Cuticle Biosynthesis in Tomato Leaves Is Developmentally Regulated by Abscisic Acid

Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

NaCI Reduces Indole-3-Acetic Acid Levels in the Roots of Tomato Plants Independent of Stress-Induced Abscisic Acid

Contact Info

Product

Resources

About