scholarly journals Characterisation of indigenous apple accessions with respect to polymorphism of ACS1 and ACO1 genes

2021 ◽  
Vol 26 (52) ◽  
pp. 151-157
Author(s):  
Slađana Marić ◽  
Ivana Glišić ◽  
Nebojša Milošević ◽  
Sanja Radičević ◽  
Milena Đorđević ◽  
...  
Keyword(s):  
Acc Oxidase ◽  
Acc Synthase ◽  
Restriction Enzymes ◽  
Enzymatic Digestion ◽  
Apple Fruit ◽  
Pcr Product ◽  
Signalling Molecule ◽  
Genes Encoding ◽  
Breeding Programmes ◽  
Important Position

Ethylene is the simplest signalling molecule with a hormone-like function that plays a major role in many developmental processes, including ripening of climacteric apple fruit. The allelic polymorphisms of ACS1 and ACO1 genes, encoding for ACC synthase and ACC oxidase, which catalyse the last two steps in the ethylene biochemical pathway, were analysed in nineteen indigenous apple accessions grown in individual growers' orchards in the regions of central and southwestern Serbia. A polymorphism was detected using the polymerase chain reaction (PCR) for the ACS1 gene and the additional enzymatic digestion of the PCR product with BamH1 and RsaI for the ACO1 gene. The ACS1-1 and ACS1-2 alleles of the ACS1 gene, as well as the a and c alleles of the ACO1 gene were identified. The polymorphisms observed upon PCRs and digestion with restriction enzymes were generated in two genotypes for both genes, i.e. the ACS1 gene - ACS1-1/1 and ACS1-1/2, and the ACO1 gene - aa and ac. Out of nineteen apple accessions, sixteen were homozygous for the allele ACS1-1 and three were heterozygous (ACS1-1/2); regarding the ACO1 genotype, fourteen were homozygous for the allele a and five were heterozygous (ac allelic constitution). The molecular survey in the current study provides an increase in the number of apple accessions with potential to be used as parents in breeding programmes, aiming to obtain high quality cultivars that retain fruit texture during long storage. Therefore, the heterozygous accessions for the ACS1 gene - 'J-LuN/1', 'Kraljica' and 'Šumatovka', may have an important position in future breeding programmes.

scholarly journals Synergistic Effects of the Combined Application of MCP and Low O2 on Apple Fruit Ripening

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1143D-1144
Author(s):  
Mehar Asif ◽  
Prabodh Trivedi ◽  
Theophanes Solomos ◽  
Autar Mattoo
Keyword(s):  
Fruit Ripening ◽  
Similar Pattern ◽  
Synergistic Effects ◽  
Acc Oxidase ◽  
Acc Synthase ◽  
Apple Fruit ◽  
Single Application ◽  
Combined Application ◽  
Putative Receptor

We have studied the effects of MCP and low O2, applied singly and in combination, on apple fruit ripening at 1, 7, and 18 °C. The single application of 2 ppm MCP is more effective in delaying the onset of the C2H4 climacteric than is 1% O2. However, the combined application has a much larger effect than the single applications of either MCP or 1% O2. For instance, at 7 °C, the onset of the C2H4 climacteric occurs at 15, 50, and 90–95 days for the controls, 1% O2 and 2 ppm MCP, respectively, whereas the combined application of 2 ppm MCP and 1% O2 suppressed the initiation of the C2H4 climacteric for 200 days, the duration of the experiment. The retardation of the climacteric onset by the treatments is associated with the suppression of ACC-synthase (ACS1) and the putative receptor ERS1. The accumulation of their transcripts is critically dependent on the rate of C2H4 evolution. As expected, the combined application of MCP and 1% O2 completely suppressed the expression of both genes. Yet when the fruits were transferred to 18 °C in air, they ripened normally. A similar pattern of inhibition in response to the above treatments was also observed with a C2H4-dependent MAPK. The expression of ETR1, ETR2 and ACC-oxidase was not affected by the treatments. The nature of this strong effect of the combined application of MCP and low O2 is not clear. It should be pointed out that MCP does not inhibit the induction of hypoxic proteins such as ADH.

scholarly journals Systemic Resistance in Arabidopsis Induced by Rhizobacteria Requires Ethylene-Dependent Signaling at the Site of Application

1999 ◽  
Vol 12 (8) ◽  
pp. 720-727 ◽  
Author(s):  
Marga Knoester ◽  
Corné M. J. Pieterse ◽  
John F. Bol ◽  
Leendert C. Van Loon
Keyword(s):  
Pseudomonas Syringae ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Signal Transduction Pathway ◽  
Acc Oxidase ◽  
Acc Synthase ◽  
Systemic Resistance ◽  
Essentially Normal ◽  
Genes Encoding ◽  
Ethylene Insensitivity

Root colonization of Arabidopsis thaliana by the nonpathogenic, rhizosphere-colonizing, biocontrol bacterium Pseudomonas fluorescens WCS417r has been shown to elicit induced systemic resistance (ISR) against Pseudomonas syringae pv. tomato (Pst). The ISR response differs from the pathogen-inducible systemic acquired resistance (SAR) response in that ISR is independent of salicylic acid and not associated with pathogenesis-related proteins. Several ethylene-response mutants were tested and showed essentially normal symptoms of Pst infection. ISR was abolished in the ethylene-insensitive mutant etr1-1, whereas SAR was unaffected. Similar results were obtained with the ethylene-insensitive mutants ein2 through ein7, indicating that the expression of ISR requires the complete signal-transduction pathway of ethylene known so far. The induction of ISR by WCS417r was not accompanied by increased ethylene production in roots or leaves, nor by increases in the expression of the genes encoding the ethylene biosynthetic enzymes 1-aminocyclopropane-1-carboxylic (ACC) synthase and ACC oxidase. The eir1 mutant, displaying ethylene insensitivity in the roots only, did not express ISR upon application of WCS417r to the roots, but did exhibit ISR when the inducing bacteria were infiltrated into the leaves. These results demonstrate that, for the induction of ISR, ethylene responsiveness is required at the site of application of inducing rhizobacteria.

scholarly journals Low Oxygen and Elevated Carbon Dioxide Atmospheres Inhibit Ethylene Biosynthesis in Preclimacteric and Climacteric Apple Fruit

1997 ◽  
Vol 122 (4) ◽  
pp. 542-546 ◽  
Author(s):  
James R. Gorny ◽  
Adel A. Kader
Keyword(s):  
Enzyme Activity ◽  
Mrna Level ◽  
Acc Oxidase ◽  
Acc Synthase ◽  
Transcript Abundance ◽  
Ethylene Biosynthesis ◽  
Apple Fruit ◽  
Low Oxygen ◽  
Rate Limiting Step

Autocatalytic C2H4 biosynthesis in preclimacteric apple fruit (Malus domestica Borkh. `Golden Delicious') was prevented by storage in atmospheres of 20% CO2-enriched air (17% O2 + 63% N2) or 0.25% O2 (balance N2). In preclimacteric fruit, both treatments inhibited C2H2 biosynthesis by suppressing expression of ACC synthase (ACC-S) at the mRNA level. ACC oxidase (ACC-O) mRNA abundance and in vitro enzyme activity also were impaired by these treatments. However, the conversion of ACC to C2H4 never became the rate limiting step in C2H4 biosynthesis. C2H4 biosynthesis also was effectively inhibited in climacteric apple fruit kept in air + 20% CO2 or 0.25% O2. Climacteric apples also exhibited suppressed expression of ACC-S at the mRNA level, while ACC-O transcript abundance, enzyme activity, and protein abundance were reduced only slightly. ACC-S is the key regulatory enzyme of C2H4 biosynthesis and is the major site at which elevated CO2 and reduced O2 atmospheres inhibit C2H4 biosynthesis, irrespective of fruit physiological maturity. Chemical names used: 1-aminocyclopropane-1-carboxcylic acid (ACC).

scholarly journals Elevated CO2 and/or Low O2 Atmospheres Influence ACC Synthase and ACC Oxidase during Long-term Storage of `Golden Delicious' Apple Fruit

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 782C-782
Author(s):  
James R. Gorny ◽  
Adel A. Kader
Keyword(s):  
Blot Analysis ◽  
Acc Oxidase ◽  
Acc Synthase ◽  
Ethylene Biosynthesis ◽  
Apple Fruit ◽  
Long Term Storage ◽  
Golden Delicious ◽  
Compare And Contrast

The objective of this study was to compare and contrast the mode of action by which elevated carbon dioxide and/or reduced oxygen atmospheres inhibit ethylene biosynthesis. `Golden Delicious' apple fruit were placed at 0C in one of the following four atmospheres: 1) air; 2) air + 5% CO2; 3) 2% O2 + 98% N2; or 4) 2% O2 + 5% CO2 + 93% N2 and then sampled monthly for 4 months. Ethylene biosynthesis rates and in vitro ACC synthase activities were closely correlated in all treatments. In vitro ACC synthase activity and ethylene biosynthesis rates were lowest in fruit treated with 5% CO2 + 2% O2, while air-treated fruit had the highest ethylene biosynthesis rate and in vitro ACC synthase activity. Fruit treated with air + 5% CO2, or 2% O2 + 98% N2, had intermediate ethylene and in vitro ACC synthase activities. In vitro ACC oxidase was significantly different among treatments, but not as closely correlated with the ethylene biosynthesis rate as in vitro ACC synthase activity. Western blot analysis of the ACC oxidase protein was performed to determine if activity differences among treatments were correlated with the amount of enzyme present in vivo. ACC synthase and ACC oxidase mRNA transcript of abundance was determined via Northern blot analysis. Results will be discussed regarding how ethylene biosynthesis is inhibited at the molecular level by elevated CO2 and/or reduced O2.

scholarly journals Induction of Phytohormones and Differential Gene Expression in Citrus Flowers Infected by the Fungus Colletotrichum acutatum

2004 ◽  
Vol 17 (12) ◽  
pp. 1394-1401 ◽  
Author(s):  
Katherine A. Lahey ◽  
Rongcai Yuan ◽  
Jacqueline K. Burns ◽  
Peter P. Ueng ◽  
L. W. Timmer ◽  
...  
Keyword(s):  
Gene Expression ◽  
Differential Gene Expression ◽  
Acc Oxidase ◽  
Acc Synthase ◽  
Colletotrichum Acutatum ◽  
Young Fruit ◽  
Fruit Drop ◽  
Significant Difference ◽  
Genes Encoding ◽  
Differential Gene

Colletotrichum acutatum infects citrus petals and induces premature fruit drop and the formation of persistent calyces. The accumulation of hormones and other growth regulators, and differential gene expression in affected flowers and young fruit, was examined following fungal infection. Ethylene evolution increased threefold and indole-3-acetic acid (IAA) accumulation was as much as 140 times. Abscisic acid (ABA) levels showed no significant response. After infection, both trans- and cis-12-oxo-phytodienoic acid increased 8- to 10-fold. No significant difference of trans-jasmonic acid (JA) was observed in citrus flower petals or pistils. However, a fivefold increase of cis-JA was detected. The amount of salicylic acid (SA) was elevated twofold in affected petals, but not in pistils. Northern blot analyses revealed that the genes encoding ACC oxidase or ACC synthase, and 12-oxo-phytodienoic acid (12-oxo-PDA) reductase, were highly expressed in affected flowers. The genes encoding auxin-related proteins also were upregulated. Application of 2-(4-chlorophenoxy)-2-methyl-propionic acid (clofibrate; a putative auxin inhibitor), 2,3,5-triiodobenzolic acid (an auxin transport inhibitor), or SA after inoculation significantly decreased the accumulation of the gene transcripts of auxin-responsive, GH3-like protein and 12-oxo-PDA reductase, but resulted in higher percentages of young fruit retention. The results indicate that imbalance of IAA, ethylene, and JA in C. acutatum-infected flowers may be involved in symptom development and young fruit drop.

scholarly journals Genetical polymorphism of acc synthase and ACC oxidase in Apple selections bred in Cacak

Genetika ◽  
2005 ◽  
Vol 37 (3) ◽  
pp. 225-233 ◽  
Author(s):  
Sladjana Maric ◽  
Radovan Boskovic ◽  
Zarko Tesovic ◽  
Milan Lukic
Keyword(s):  
Restriction Analysis ◽  
Acc Oxidase ◽  
Acc Synthase ◽  
Restriction Enzymes ◽  
Storage Life ◽  
Research Centre ◽  
Allelic Polymorphism ◽  
Gene Encoding ◽  
Fruit Storage ◽  
Oxidase Gene

The work on breeding new apple cultivars, of improved quality and longer storage life has been going on for a long time at the Fruit and Grape Research Centre in Cacak. As a result nine promising apple selections, that show the range of fruit storage capability (J/l/7, J/l/20, J/2/12, J/2/14, J/ll/31, J/54/53/59, J/60/7/63, Sumatovka 1 O.P. and Sumatovka 2 O.P.), were singled out. Fruit ripening is genetically programmed, complex physiological process with the important role of plant hormone ethylene. Allelic polymorphism of the genes encoding ACC synthase and ACC oxidase, enzymes on ethylene biosynthetic pathway, was studied in promising apple selections and compared to their storage life. Polymorphism was detected by the polymerase chain reaction (PCR method) and restriction analysis with 6 restriction enzymes. Two alleles of the gene encoding ACC synthase (ACS1-1 and ACS1-2), three alleles of the ACC oxidase gene (a, b and n) were identified and a positive test for early seedling selection, the fruits of which will be characterized by long storage life, was indicated.

scholarly journals Volatile Ester Suppression and Recovery following 1-Methylcyclopropene Application to Apple Fruit

2006 ◽  
Vol 131 (5) ◽  
pp. 691-701 ◽  
Author(s):  
Alejandra Ferenczi ◽  
Jun Song ◽  
Meisheng Tian ◽  
Konstantinos Vlachonasios ◽  
David Dilley ◽  
...  
Keyword(s):  
Ethylene Production ◽  
Acc Oxidase ◽  
Acc Synthase ◽  
Apple Fruit ◽  
Expression Of Genes ◽  
Ester Formation ◽  
Golden Delicious ◽  
Alcohol Acyltransferase ◽  
Ester Biosynthesis ◽  
Exogenous Ethylene

The effect of 1-methylcyclopropene (1-MCP) on biosynthesis of volatiles and fruit ripening in apple (Malus ×domestica Borkh.) was investigated using `Golden Delicious', `Jonagold', and `Redchief Delicious' fruit. Application of 1-MCP to `Golden Delicious' at the preclimacteric stage effectively inhibited ripening as determined by decreased expression of genes for 1-amino-1-cyclopropane carboxylic acid (ACC) oxidase (ACO), and ACC synthase, ACO protein content, climacteric ethylene production, respiration, and volatile ester biosynthesis. Exogenous ethylene applied after 1-MCP treatment did not induce ethylene production, respiration, or volatile production. Activity for alcohol acyltransferase, which catalyzes the final step in ester formation, was demonstrable for 1-MCP-treated fruit, indicating no strict limitation on ester formation is imposed by this enzyme and that ester formation in 1-MCP-treated apple fruit is at least partially limited by reduced substrate synthesis. Once volatile ester formation had been suppressed by 1-MCP, the recovery of volatile synthesis required ≈3 weeks for `Jonagold' and 4 weeks for `Delicious' when held in air at 22 °C. For the first 2 months of storage at 0 °C in air, `Jonagold' and `Delicious' required ≈3 weeks holding at 22 °C for volatile biosynthesis to initiate; after 5 months in refrigerated storage, volatile formation was evident at the time of removal from cold storage. For `Jonagold' fruit held in controlled atmosphere (CA) storage for 2, 5, and 7 months at 0 °C, at least 3 weeks holding at 22 °C were required for volatile formation to begin to recover. The maximal amount of volatile formation was reduced 50% by 1-MCP relative to nontreated control fruit. CA storage had a similar impact on maximal volatile formation. The marketing of 1-MCP-treated fruit soon after treatment might result in the delivery of fruit to the consumer with little likelihood of recovery of volatile ester formation prior to consumption.

scholarly journals Preharvest Fruit Drop in Huanglongbing-affected ‘Valencia’ Sweet Orange

2019 ◽  
Vol 144 (2) ◽  
pp. 107-117 ◽  
Author(s):  
Lisa Tang ◽  
Shweta Chhajed ◽  
Tripti Vashisth
Keyword(s):  
Sweet Orange ◽  
Acc Oxidase ◽  
Pectate Lyase ◽  
Acc Synthase ◽  
Ethylene Biosynthesis ◽  
Cell Wall Modification ◽  
Expression Levels ◽  
Fruit Drop ◽  
Genes Encoding ◽  
Calyx Abscission

For field-grown ‘Valencia’ sweet orange (Citrus sinensis) affected by Huanglongbing [HLB (Candidatus Liberibacter asiaticus (CLas)], trees that displayed more severe HLB symptoms (severe trees) had 74% fruit drop before harvest; however, the drop rate for less symptomatic trees (mild trees) was 45%. For mature fruit (3 weeks before harvest) still attached to the branches, 60% of them from severe trees were “loose fruit” [fruit detachment force (FT) < 6 kgf]. In contrast, only 13% of the attached fruit from the mild trees were loose. Overall, fresh weight and size of loose fruit were lower than “tight fruit” (FT > 6 kgf). Irrespective of the symptom levels of trees, the concentrations of glucose, fructose, and inositol in juice of loose fruit were the same or larger than those of tight fruit, suggesting that the shortage of carbohydrates is not the dominant cause of HLB-associated preharvest fruit drop. Expression levels of the cell wall modification genes encoding cellulase (endo-1,4-β-glucanase), polygalacturonase, and pectate lyase were greater in the calyx abscission zones of loose fruit compared to tight fruit, indicating that cell separation was occurring in the former at the time of collection. No differences in the expression levels of genes encoding the ethylene biosynthesis enzymes, including 1-aminocyclopropane-1-carboxylic acid (ACC) synthase (ACS) and ACC oxidase (ACO), and an ethylene-responsive transcription factor 1 (ERF1) were observed in tissues of loose and tight fruit. Interestingly, ACS, ACO, and EFR1 expressions were lower in calyx abscission zones and in leaves of the severe trees compared with those of mild trees, suggesting an ostensible, HLB-dependent reduction in ethylene biosynthesis and/or signaling close to harvest time. However, the role of ethylene in HLB-associated preharvest fruit drop remains to be determined. The results leave open the possibility of early ethylene production and action before the initiation of fruit abscission.

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