Differences of reactive oxygen species metabolism in top, middle and bottom part of epicarp and mesocarp influence tomato fruit cracking

Physiological Mechanisms of Citrus Fruit Cracking: Study on Cell Wall Components, Osmoregulatory Substances, and Antioxidant Enzyme Activities

“…Higher POD activity in the pericarp could contribute to ROS scavenging and improve the resistance to cracking. However, this result is inconsistent with that of other studies on several other fruits, which indicated that POD activity was significantly higher in cracking-susceptible cultivars than in cracking-resistant cultivars and higher in cracked fruits than in normal fruits [ 12 , 35 ]. This may be attributed to the fact that in the previously studied fruits, POD primarily engages in cross-linking with cell wall phenolic components, resulting in increased POD activity and subsequent cell wall stiffening [ 36 , 37 ], thereby diminishing the mechanical properties of the fruit peel.…”

“…Furthermore, cellular senescence adapts more slowly to changes in external factors, such as moisture and light [ 12 ]. Previously, the SOD activity in the peel of a cracking-resistant variety of tomatoes was found to be higher than that of the cracking-susceptible variety [ 35 ]. Therefore, SOD plays a role in preventing the occurrence of fruit cracking.…”

“…POD is an oxidoreductase prevalent in fruit trees and plays a dual role in scavenging ROS and cross-linking the phenolic groups, which affects peel extensibility [ 35 , 36 ]. In this study, the POD activity in the pericarp of ‘Mingrijian’ decreased sharply before the occurrence of fruit cracking (75–115 days after flowering).…”

“…This suggests that during the critical period of fruit cracking, the intracellular activity of CAT increases to ease oxidative damage by ROS [ 18 , 39 ]. Moreover, the CAT activity was significantly higher in the cracking-susceptible tomato cultivar ‘LA1698’ than in the same tissues of the cracking-resistant cultivar ‘LA2683’ and was higher at the site where cracking occurred than in the fruit that did not crack [ 35 ]. The increase in CAT activity could be a defensive response against oxidative stress.…”

Aquaporins Involvement in the Regulation of Melon (Cucumis Melo L.) Fruit Cracking Under Different Nutrient (Ca, B and Zn) Treatments

“…Cracking is a physiopathy with a growing interest as can be seen in the numerous articles that have published in recent years for different fruits including cherries (Fresno and Munné-Bosch, 2021;Gutiérrez et al, 2021;Michailidis et al, 2020) tomato (Capel et al, 2017;Zhang et al, 2020), jujube (Hou et al, 2022;Li et al, 2020;Ren et al, 2017) or pomegranate (Chater and Garner, 2018;Davarpanah et al, 2018;Draie and Aboras, 2021). But also, one of the plants that can suffer cracking and it has a relevant economic impact is the melon, Cucumis melo L., a member of the Cucurbitaceae family that has a high economic impact in global market, being the fourth most important fruit in the world (De Campos et al, 2017).…”