Functional characterization of a chemical defoliant that activates fruit cluster Leaf defoliation in ‘Fuji’ apple trees

Lee, Changhee; Seo, Seung In; Kwon, Ojun; Park, Man; Kim, Wonchan; Kang, Sang-Jae

doi:10.1007/s13765-016-0218-z

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…In addition, ethylene is a key compound that plays an important role in the response of plants to a variety of stress conditions [8]. Under hypoxic condition, plants produce increased level of the enzyme 1-aminocyclopropane-1-carboxylic acid (ACC) synthase that converts the substrate S-adenosyl-L-methionine (SAM) to ACC, whereas the study of Lee et al [9] demonstrated that recombinant ACC synthase can also convert SAM into ACC for the production of ethylene. Upon oxidation, the substrate ACC is converted to ethylene by ACC oxidase [8,10].…”

Section: Introductionmentioning

confidence: 99%

Pseudomonas veronii KJ mitigates flood stress-associated damage in Sesamum indicum L.

2018

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Physiological characteristics of terrestrial plants are severely affected by waterlogging stress, leading to low photochemical efficiency of leaves and retarded growth and development. Plant growth-promoting rhizobacteria contain the acdS gene, which encodes for the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase. ACC deaminase cleaves the substrate ACC to produce aketobutyrate and ammonia and mitigates the adverse effect of prolonged water stress. The aim of this study was to characterize ACC deaminase-producing rhizobacteria and evaluate their effects on sesame (Sesamum indicum L.) under waterlogging stress condition. The rhizobacterium Pseudomonas KJ was characterized on the basis of sequencing of the partial 1501 bp fragment of 16S rDNA amplicon and confirmed as Pseudomonas veronii KJ. ACCsupplemented minimal medium revealed the phenotypic identification of acdS gene. The nucleotide sequence (1001 bp) of ACC deaminase gene of P. veronii KJ was also confirmed. We used P. veronii KJ as a bioinoculant in waterlogging stress and monitored the growth and developmental characteristics of sesame plants, including leaf chlorophyll fluorescence signals, concentration of chlorophyll, root and shoot length, and fresh and dry biomass in stressed versus unstressed plants. Plants treated with P. veronii KJ significantly (P B 0.05) mitigated the waterlogging stress-related damage. Thus, the rhizobacterium Pseudomonas veronii KJ may be considered as a commendable addition to the consortium of beneficial microbes for its ability to reduce waterlogging stress-related damage in sesame plants.

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Section: Introductionmentioning

confidence: 99%

Pseudomonas veronii KJ mitigates flood stress-associated damage in Sesamum indicum L.

2018

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Pneumatic Defoliation Enhances Fruit Skin Color and Anthocyanin Pigments in ‘Picnic’ Apples

Win¹,

Lee²,

Kim³

et al. 2023

Agronomy

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Apple skin color is essential for market value. Therefore, this study evaluated the efficiency of pneumatic defoliation (PD) on the enhancement of red skin color and anthocyanin pigments in ‘Picnic’ apples. Three weeks before harvesting, apple trees were treated with PD with low- (0.7 bar) and high- (0.9 bar) air pressure at a tractor driving speed of 2 km/h. Undefoliated trees served as controls. Higher leaf defoliation and leaf damage rates were observed in the high-PD treatment than those in the low-PD treatment. Photosynthetically active radiation inside the canopies was the highest in trees subjected to high-pressure PD than in those that underwent low-pressure PD and the controls. At harvest, the fruit color (a*) value, red-colored area, and anthocyanin content in the fruit skin were the highest in the high-PD treatment, intermediate in the low-PD treatment, and the lowest in the control treatments. Additionally, a higher expression of anthocyanin biosynthetic genes was observed in both defoliation treatments, especially under high PD. However, except for higher flesh firmness under low PD, the L* and b* values and fruit quality indices (fruit weight, starch pattern index, titratable acidity, soluble solids content, and sunburn occurrence) were not significantly affected by either PD treatment. In conclusion, PD can be used to enhance skin coloration and anthocyanin pigments in apples; further PD with high air pressure achieved optimum red skin coloration in ‘Picnic’ apples.

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Reviewing the Tradeoffs between Sunburn Mitigation and Red Color Development in Apple under a Changing Climate

et al. 2023

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Orchard systems have drastically changed over the last three decades to high-density plantings that prioritize light interception that is evenly distributed throughout the entire canopy. These conditions allow the production of fruit with a high red color that meets consumer demands for uniformly colored fruit without external disorders. However, these systems also expose a higher proportion of fruit to full-sunlight conditions. In many semi-arid apple production regions, summer temperatures often exceed thresholds for the development of fruit sunburn, which can lead to >10% fruit losses in some regions and some years. To combat this, growers and researchers use sunburn mitigation strategies such as shade netting and evaporative cooling, which bring a different set of potential fruit quality impacts. Often, there is a tradeoff between red color development and fruit sunburn, particularly for strategies that affect light intensity reaching the fruit surface. In this paper, we review agronomic and environmental factors leading to reductions in red color and increases in sunburn incidence, along with advancements in management practices that help mitigate these issues. Furthermore, we also identify gaps in knowledge on the influence climate change might have on the viability of some practices that either enhance red color or limit sunburn for apple orchards in semi-arid environments. There is a need for cost-effective management strategies that reduce losses to sunburn but do not inhibit red color development in bicolor apple cultivars.

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Functional characterization of a chemical defoliant that activates fruit cluster Leaf defoliation in ‘Fuji’ apple trees

Cited by 4 publications

References 15 publications

Pseudomonas veronii KJ mitigates flood stress-associated damage in Sesamum indicum L.

Pseudomonas veronii KJ mitigates flood stress-associated damage in Sesamum indicum L.

Pneumatic Defoliation Enhances Fruit Skin Color and Anthocyanin Pigments in ‘Picnic’ Apples

Reviewing the Tradeoffs between Sunburn Mitigation and Red Color Development in Apple under a Changing Climate

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