Phenolic Acids - Possible Involvement in Regulating Growth and Alternate Fruiting in Olive Trees.

Lavee, S.; Harshemesh, H.; Avidan, N.

doi:10.17660/actahortic.1986.179.46

Cited by 18 publications

(16 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Total phenolic compounds in leaf samples, showed significant differences between ON-and OFF-trees parallel to the data from Mert et al 40 . However, the analysis here could not detect gene homologue(s) to those of chlorogenic acid metabolism, which has been considered to have a probable role in olive flower induction and AB [41][42][43] . RNA-Seq results showed no significant differences between ON-and OFF-trees in terms of DPPH presence and enzymes which are involved in flavonoid biosynthesis such as flavonoid 3′,5′-methyltransferase, flavonol 3-O-glucosyltransferase and flavonoid 3′-monooxygenase.…”

Section: Discussionmentioning

confidence: 56%

Differential expression of genes in olive leaves and buds of ON- versus OFF-crop trees

Dastkar

Soleimani

Jafary

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Alternate bearing (AB) refers to the tendency of trees to have an irregular crop load from 1 year (ON) to the next year (OFF). Despite its economic importance, it is not fully understood how gene networks and their related metabolic pathways may influence the irregular bearing in olive trees. To unravel molecular mechanisms of this phenomenon in olive (cv. Conservalia), the whole transcriptome of leaves and buds from ON and OFF-trees was sequenced using Illumina next generation sequencing approach. The results indicated that expressed transcripts were involved in metabolism of carbohydrates, polyamins, phytohormones and polyphenol oxidase (POD) related to antioxidant system. Expression of POD was increased in leaf samples of ON- versus OFF-trees. The expression pattern of the greater number of genes was changed more in buds than in leaves. Up-regulation of gene homologues to the majority of enzymes that were involved in photorespiration metabolism pathway in buds of ON-trees was remarkable that may support the hypotheses of an increase in photorespiratory metabolism in these samples. The results indicated changes in expression pattern of homologous to those taking part of abscisic acid and cytokinin synthesis which are connected to photorespiration. Our data did not confirm expression of homologue (s) to those of chlorogenic acid metabolism, which has been addressed earlier that have a probable role in biennial bearing in olive. Current findings provide new candidate genes for further functional analysis, gene cloning and exploring of molecular basses of AB in olive.

show abstract

Section: Discussionmentioning

confidence: 56%

Differential expression of genes in olive leaves and buds of ON- versus OFF-crop trees

Dastkar

Soleimani

Jafary

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…As a consequence, there was an increase in the total content of phenolic compounds in shoot tissues from seedlings treated with the lowest concentration of sedaxane, but not at the highest dose. However, there were substantial changes in the concentrations of individual phenolic acids in relation to fungicide application: In particular, there was a considerable increase in caffeic acid in treated plants, which may be of interest in view of its weak auxin-like effect ( Lavee et al, 1986 ; Ishikura et al, 2001 ; Nagasawa et al, 2016 ). The main precursor of lignin in the cell wall of gramineous plants is p -coumaric acid, and a greater abundance of it in sedaxane-treated plants could contribute to more intense cell activity and division.…”

Section: Discussionmentioning

confidence: 99%

Biostimulant Effects of Seed-Applied Sedaxane Fungicide: Morphological and Physiological Changes in Maize Seedlings

et al. 2017

View full text Add to dashboard Cite

Most crops are routinely protected against seed-born and soil-borne fungal pathogens through seed-applied fungicides. The recently released succinate dehydrogenase inhibitor (SDHI), sedaxane®, is a broad-spectrum fungicide, used particularly to control Rhizoctonia spp., but also has documented growth-enhancement effects on wheat. This study investigates the potential biostimulant effects of sedaxane and related physiological changes in disease-free maize seedlings (3-leaf stage) at increasing application doses (25, 75 and 150 μg a.i. seed-1) under controlled sterilized conditions. We show sedaxane to have significant auxin-like and gibberellin-like effects, which effect marked morphological and physiological changes according to an approximate saturation dose-response model. Maximum benefits were attained at the intermediate dose, which significantly increased root length (+60%), area (+45%) and forks (+51%), and reduced root diameter as compared to untreated controls. Sedaxane enhanced leaf and root glutamine synthetase (GS) activity resulting in greater protein accumulation, particularly in the above-ground compartment, while glutamate synthase (GOGAT) activity remained almost unchanged. Sedaxane also improved leaf phenylalanine ammonia-lyase (PAL) activity, which may be responsible for the increase in shoot antioxidant activity (phenolic acids), mainly represented by p-coumaric and caffeic acids. We conclude that, in addition to its protective effect, sedaxane can facilitate root establishment and intensify nitrogen and phenylpropanoid metabolism in young maize plants, and may be beneficial in overcoming biotic and abiotic stresses in early growth stages.

show abstract

“…However, past studies have given contrasting result regarding correlations between chlorogenic acid levels and developmental changes such as vegetative versus reproductive growth. For example, higher levels of chlorogenic acid were found in leaves of flowering olive trees versus nonflowering tree but exogenous application of chlorogenic acid had no effect on floral differentiation [45][46][47][48]. High levels of chlorogenic acid were found in Lonicera japonica flowers, but in Asparagus officinalis, flowering was closely related to decreases in chlorogenic acid levels.…”

Section: Discussionmentioning

confidence: 99%

Inducing Flushing in Citrus Cultivars and Changes in Polyphenols Associated With Bud Break and Flowering

Malik¹,

Pérez²,

Kunta³

2015

Horticulture

View full text Add to dashboard Cite

The presence of leaves in citrus inhibit axillary bud break which were released, in several citrus cultivars, as soon as leaves were removed. Since even the presence of small petiole alone was as effective in inhibiting bud growth in Satsuma trees as the whole leaf, this indicates that the supply of sugars or photosynthesis play little role in regulating bud break in Owari Satsuma trees. It appears that physical injury through complete defoliation may trigger hormonal stimulation that in turn initiates the metabolic processes leading to bud break. Majority of bud break from defoliation developed vegetative growth, but, as anticipated, chilling treatment in defoliated plants resulted in majority of buds breaking into flowers. Since differentiation of buds into vegetative or reproductive structures occur in the absence of leaves it indicates that in grapefruit, and possibly other citrus cultivars, metabolic processes leading to flowering occur within the resting bud tissue. Changes in the levels of specific polyphenols occur when buds begin to sprout as vegetative shoot, marked by increase in chlorogenic acid and naringenin levels. When buds develop into reproductive structures then such developmental change accompany dramatic rise in the levels of hesperidin, naringenin, and Apigenin-7-glucoside. In general, the results clearly show a strong inhibition of axillary bud sprouting even with the presence of a small portion of the leaf. Very distinct changes in the levels of specific polyphenols were associated with bud sprouting to vegetative shoot and when it develops into flower.

show abstract

Phenolic Acids - Possible Involvement in Regulating Growth and Alternate Fruiting in Olive Trees.

Cited by 18 publications

References 0 publications

Differential expression of genes in olive leaves and buds of ON- versus OFF-crop trees

Differential expression of genes in olive leaves and buds of ON- versus OFF-crop trees

Biostimulant Effects of Seed-Applied Sedaxane Fungicide: Morphological and Physiological Changes in Maize Seedlings

Inducing Flushing in Citrus Cultivars and Changes in Polyphenols Associated With Bud Break and Flowering

Contact Info

Product

Resources

About