Effects of pre-harvest gibberellic acid spray on endogenous hormones and fruit quality of kumquat (<i>Citrus japonica</i>) fruits

Cai, Nan; Chen, Chuying; Wan, Chunpeng; Chen, Jinyin

doi:10.1080/01140671.2020.1806084

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…Research has shown that auxin is involved in the formation of the abscission layer and plays a role in delaying plant organ abscission [19]. 2,4-D is a growth regulator that belongs to the auxin class and has been used in citrus and other fruit trees to retain fruit and delay fruit abscission [20][21][22]. One of the ways in which GA inhibits fruit ripening and senescence is by suppressing the accumulation of 1-aminocyclopropane-1-carboxylic acid (ACC), a precursor of ethylene biosynthesis, thereby inhibiting ethylene production [23].…”

Section: Discussionmentioning

confidence: 99%

Response of Abscission Zone of Blue Honeysuckle (Lonicera caerulea L.) Fruit to GA3 and 2,4-D Spray Application

Ren,

Zhang,

Chen

et al. 2023

Agronomy

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The nutritional value of blue honeysuckle (Lonicera caerulea L.) fruit is abundant; however, its production faces challenges due to a short harvesting period and fruit drop issues. In this study, the effects and potential mechanisms of two different plant growth regulators, GA3 (Gibberellins acid) and 2,4-D (2,4-Dichlorophenoxyacetic acid), on blue honeysuckle fruit abscission and abscission layer formation were investigated. The main cultivated variety of blue honeysuckle, ‘Berel’, was used as the experimental material. GA3 and 2,4-D were sprayed on the plants from the veraison. The anatomical structure of the fruit abscission zone (FAZ) was observed after treatment. Key enzymes involved in cell wall degradation, pectinase, cellulase, polygalacturonase, and pectin methylesterase, were analyzed for their activities. Furthermore, the gene expression levels of cell wall detachment-related genes CX1, CX2, PL20, PE, and key genes for gibberellin and ethylene synthesis GA2OX1, GA1, ACO, and ACO3 were examined. The results indicated that the application of GA3 and 2,4-D could delay the formation of the abscission layer. In the FAZ treated with GA3 and 2,4-D at 5 DAT, the activity of key enzymes involved in cell wall degradation decreased, the expression of genes related to cell wall degradation enzymes and key genes for ethylene synthesis was inhibited, and the drop of fruit reduced. In conclusion, exogenous application of GA3 and 2,4-D suppresses the abscission of ‘Berel’ blue honeysuckle fruit, likely through the inhibition of cell wall degradation and abscission layer formation.

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Section: Discussionmentioning

confidence: 99%

Response of Abscission Zone of Blue Honeysuckle (Lonicera caerulea L.) Fruit to GA3 and 2,4-D Spray Application

Ren,

Zhang,

Chen

et al. 2023

Agronomy

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“…The study found that exogenous use of GA 3 often affects fruit quality by affecting the content of endogenous hormones. For example, exogenous use of GA 3 increased endogenous GA 3 content in citrus and inhibited the rate of fruit browning (Cai et al, 2021). Liu et al (2011) found that exogenous GA 3 could regulate the growth of tiller buds by changing the endogenous ABA, IAA, and ZR contents of rice plants.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Joint metabolome and transcriptome analysis of the effects of exogenous GA3 on endogenous hormones in sweet cherry and mining of potential regulatory genes

Chen

et al. 2022

Front. Plant Sci.

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Gibberellin (GA) is an important phytohormone that can participate in various developmental processes of plants. The study found that application of GA3 can induce parthenocarpy fruit and improve fruit set. However, the use of GA3 affects endogenous hormones in fruits, thereby affecting fruit quality. This study mainly investigates the effect of exogenous GA3 on endogenous hormones in sweet cherries. The anabolic pathways of each hormone were analyzed by metabolome and transcriptome to identify key metabolites and genes that affect endogenous hormones in response to exogenous GA3 application. Results showed that exogenous GA3 led to a significant increase in the content of abscisic acid (ABA) and GA and affected jasmonic acid (JA) and auxin (IAA). At the same time, the key structural genes affecting the synthesis of various hormones were preliminarily determined. Combined with transcription factor family analysis, WRKY genes were found to be more sensitive to the use of exogenous GA3, especially the genes belonging to Group III (PaWRKY16, PaWRKY21, PaWRKY38, PaWRKY52, and PaWRKY53). These transcription factors can combine with the promoters of NCED, YUCCA, and other genes to regulate the content of endogenous hormones. These findings lay the foundation for the preliminary determination of the mechanism of GA3’s effect on endogenous hormones in sweet cherry and the biological function of WRKY transcription factors.

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Orange Colour Formation and Pigment Variation on Tropical Tangerine Peel by Precooling and Degreening

Efendi¹,

S.²,

Budiarto³

et al. 2022

Asian J. of Plant Sciences

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Effects of pre-harvest gibberellic acid spray on endogenous hormones and fruit quality of kumquat (Citrus japonica) fruits

Cited by 3 publications

References 38 publications

Response of Abscission Zone of Blue Honeysuckle (Lonicera caerulea L.) Fruit to GA3 and 2,4-D Spray Application

Response of Abscission Zone of Blue Honeysuckle (Lonicera caerulea L.) Fruit to GA3 and 2,4-D Spray Application

Joint metabolome and transcriptome analysis of the effects of exogenous GA3 on endogenous hormones in sweet cherry and mining of potential regulatory genes

Orange Colour Formation and Pigment Variation on Tropical Tangerine Peel by Precooling and Degreening

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