Gibberellic acid inhibited chlorophyll degradation in post-harvest okras

Self Cite

Okra has been widely cultivated worldwide. Consumers appreciate its nutritional value and delicious taste. However, okra is very perishable after harvest because of rapid senescence and high susceptibility to mechanical injuries, which limits its storage life and reduces consumer acceptance. This study examined the influence of melatonin treatment on senescence process and endogenous plant signalling molecules in postharvest okras. The results indicated that melatonin treatment delayed senescence by increasing the endogenous melatonin content through upregulation of its biosynthetic genes. In addition, the treatment increased the contents of indole-3-acetic acid (IAA) and gibberellin (GA) due to the positive modulation of their metabolic and signalling genes. Furthermore, treated okras exhibited higher levels of γ-aminobutyric acid (GABA) but lower abscisic acid (ABA) content, contributing to the delayed senescence process compared to control. Overall, the findings suggested that melatonin postponed senescence in okras fruit by positively regulating endogenous signalling molecules such as melatonin, IAA, GABA, GA, and ABA.

Section: Discussionmentioning

confidence: 99%

Melatonin delayed senescence by modulating the contents of plant signalling molecules in postharvest okras

Shi,

Chen,

Dong

et al. 2024

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“…(2020) revealed that HRW treatment enhanced the growth of mung bean seedlings by stimulating elongation of hypocotyl and root cells via increasing GA and IAA content, suggesting that hydrogen acted upstream of IAA and GA biosynthesis during plant growth. Meanwhile, GA and IAA have been demonstrated their roles in inhibiting the senescence process in postharvest okras and strawberries, respectively ( Chen et al., 2014 ; Xiao et al., 2022 ). Therefore, to further reveal the crosstalk between hydrogen and GA or IAA, the biosynthetic and signalling pathways of these two phytohormones were investigated in okras after HRW treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have showed that ABA induced fruit senescence in postharvest sweet cherries ( Luo et al., 2014 ) and enhanced the resistance against chilling in harvested zucchini ( Carvajal et al., 2017 ). A tetracyclic diterpenoid hormone known as gibberellic acid (GA) has been reported to maintain fruit quality and prolong shelf life in postharvest okras ( Xiao et al., 2022 ), Chinese flowering cabbage ( Fan et al., 2021 ), persimmons ( Maurer et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-rich water treatment increased several phytohormones and prolonged the shelf life in postharvest okras

Dong

Cao²,

Zhou³

et al. 2023

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Hydrogen-rich water (HRW) treatment has been reported to delay the softening and senescence of postharvest okras, but its regulatory mechanism remains unclear. In this paper, we investigated the effects of HRW treatment on the metabolism of several phytohormones in postharvest okras, which act as regulatory molecules in fruit ripening and senescence processes. The results showed that HRW treatment delayed okra senescence and maintained fruit quality during storage. The treatment upregulated all of the melatonin biosynthetic genes such as AeTDC, AeSNAT, AeCOMT and AeT5H, contributing to the higher melatonin content in the treated okras. Meanwhile, increased transcripts of anabolic genes but lower expression of catabolic genes involved in indoleacetic acid (IAA) and gibberellin (GA) metabolism were observed in okras when treated with HRW, which was related to the enhanced levels of IAA and GA. However, the treated okras experienced lower abscisic acid (ABA) content as compared to the non-treated fruit due to the down-regulation of its biosynthetic genes and up-regulation of the degradative gene AeCYP707A. Additionally, there was no difference in γ-aminobutyric acid between the non-treated and HRW-treated okras. Collectively, our results indicated that HRW treatment increased levels of melatonin, GA and IAA, but decreased ABA content, which ultimately delayed fruit senescence and prolonged shelf life in postharvest okras.

“…The exogenous infusion of gibberellins speeds up and synchronises flowering and increases yield by stimulating cell elongation and division (Mauromicale and Ierna, 2000). To extend the shelf-life and quality of fresh fruits and vegetables, gibberellins have been used as a pre-harvest treatment to delay the degreening of okra fruits (Xiao et al, 2022) and the repining of tomato fruits (Li et al, 2019). The influence that the gibberellin treatment has on the quality of the crop after it has been harvested has received some attention.…”

Section: Gibberellinsmentioning

confidence: 99%

Effect of pre- and postharvest treatments on the quality and storage ability of fresh artichoke heads: opinion article

El-Mogy,

Rashed,

AlTurki

et al. 2024

Globe artichoke (Cynara cardunculus var. scolymus) is a perennial plant belonging to the Asteraceae family. The edible part of the globe artichoke plant (known as the head or bud) is the immature inflorescence before any sign of opening, the enlarged receptacle (bottom), as well as the tender bases of the bracts, which are used all over the world for fresh consumption or minimally processed (fresh-cut or ready to eat) (Pandino and Mauromicale, 2020). The best quality indexes for globe artichoke heads are free from discoloration, green, tightly closed bracts, tender, and free from any other defects (Mencarelli et al., 1993). After harvesting and during the handling processes and shipping, globe artichoke heads may lose their quality, which is represented by bracts wilting, opening, and yellowing (Ricci et al., 2013).In 2021, according to FAOSTAT, the global production of globe artichoke was 1470332 tones, harvested from 116350 ha. Additionally, the value of globe artichoke exports globally reached 62851000 US $, while the value of imports globally reached 73259000 US $. The European Union is the largest producer (55.6% of total world production, according to FAOSTAT in 2021) and consumer of globe artichokes, with Italy, Spain, and Egypt being the major producers (FAOSTAT, 2021). Other significant globe artichoke producing regions include Africa, the Americas, and Asia, with 21.1%, 14.7%, and 8.7% of global production, respectively.Additionally, the rising awareness of the health benefits of globe artichokes is also contributing to the market's growth. It has been well known that globe artichoke contains several antioxidants and health compounds, including polyphenols (