Influence of abscisic acid on polyphenol oxidase browning potential in avocado

Bower, J.P.; Cutting, J. G. M.

doi:10.1080/02571862.1988.10634248

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…In Arabidopsis, AtHAB1 gene expression may be regulated by a negative feedback loop mediated by ABA signaling (Schweighofer et al, 2004). In addition, ABA-dependent stress signaling may increase the activity of PPOs, stimulating browning (Bower and Cutting, 1988). Based on these observations, we suggest that ABA signaling is suppressed in the latter stages of berry maturation, when skin browning has not been initiated.…”

Section: Effects Of Aba/ethephon Treatments On Phytohormone Metabolismmentioning

confidence: 82%

Effects of Abscisic Acid/Ethephon Treatments on Berry Development and Maturation in the Yellow-green Skinned ‘Shine Muscat’ Grape

et al. 2019

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Abscisic acid (ABA) and ethylene are well-known phytohormones that are involved in the maturation of grape berries and other fruits. However, the process of yellow-green skinned grape berry maturation is not well understood due to difficulties in determining grape maturity from changes in skin color. Skin browning during maturation is a major commercial problem in some yellow-green skinned grape cultivars including 'Shine Muscat'. To resolve this issue, a better understanding of the mechanisms involved in grape maturation and skin-browning is needed. We treated 'Shine Muscat' grape clusters at the veraison stage (45-50 DAFB) with spray applications of ABA or ethephon. These treatments produced darker colors and increased the transresveratrol and flavonol contents of berry skins. The ABA and ethephon treatments significantly increased the severity of skin browning. Changes in the expression of genes involved in polyphenol biosynthesis and oxidation were consistent with increases in polyphenols and the severity of browning in berry skins. The expression of VvACO2 and VvYUC1 genes, which are involved in ethylene and auxin biosynthesis, respectively, were upregulated in berries with brown skins. Although ABA treatment also increased the size of the berries, the effect of ethephon treatment on berry maturation was similar to, or greater than, that of ABA treatment. In berry skins, the expression of VvACO3, which is involved in phytohormone biosynthesis, increased significantly in response to ABA treatment. Overall, the changes in gene expression produced by ABA and ethephon treatments differed. Therefore, different mechanisms may regulate the physiological responses to ABA and ethephon, although both treatments accelerate berry maturation.

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Section: Effects Of Aba/ethephon Treatments On Phytohormone Metabolismmentioning

confidence: 82%

Effects of Abscisic Acid/Ethephon Treatments on Berry Development and Maturation in the Yellow-green Skinned ‘Shine Muscat’ Grape

et al. 2019

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“…The impact of vibration and large amplitude accelerations (Steyn et al, 2011;Pretorius & Steyn, 2012) alongside interfacial stresses (Pretorius & Steyn, 2019;Li & Thomas, 2014) associated with poor riding quality of road infrastructure (Ruiz-Altisent & Ortiz-Canavate, 1992) on tomatoes, are known to reduce the shelf-life markedly (Pretorius and Steyn, 2016;Workneh, 2017). Temperature and relative humidity are also crucial factors to consider (Toerien, 1986;Bower, 1988;Vorster et al, 1990), but are more easily controlled and maintained during transportation and storage. Instrumentation and power requirements for monitoring fresh produce transported over extended distances remain challenging despite advancements in sensor technologies (Steyn, 2017).…”

Section: Introductionmentioning

confidence: 99%

smAvo: Packhouse optimization using smart avocadoes in South Africa

Broekman

Steyn

2021

Computers and Electronics in Agriculture

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Influence of abscisic acid on polyphenol oxidase browning potential in avocado

Cited by 2 publications

References 8 publications

Effects of Abscisic Acid/Ethephon Treatments on Berry Development and Maturation in the Yellow-green Skinned ‘Shine Muscat’ Grape

Effects of Abscisic Acid/Ethephon Treatments on Berry Development and Maturation in the Yellow-green Skinned ‘Shine Muscat’ Grape

smAvo: Packhouse optimization using smart avocadoes in South Africa

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