Effects of Salt Stress on Fruit Antioxidant Capacity of Wild (Solanum chilense) and Domesticated (Solanum lycopersicum var. cerasiforme) Tomatoes

Abstract

The effects of salt on the quality of fruits were investigated in order to compare the impact of salt on key fruit properties of the cultivated domesticated tomato species (Solanum lycopersicum) and its wild halophyte relative Solanum chilense. To this end, cherry tomato plants (S. lycopersicum var. cerasiforme) and from accession LA4107 (S. chilense) were maintained for 112 days in the absence or presence of NaCl (40 and 80 mM) in nutrient solution. Among others, salinity decreased fruit weight and increased total soluble solid (TSS) in S. lycopersicum but not in S. chilense. The fruit antioxidant capacity estimated by ferric reducing antioxidant power (FRAP) analysis was higher in S. chilense than in S. lycopersicum and increased in the former while it decreased in the latter in response to NaCl. Salinity increased the lycopene (LYC) content but decreased ß-carotene (b-CAR) concentration in the fruits of S. lycopersicum, while these compounds were not detected in the wild halophyte S. chilense. The oxidative status of salt-treated fruits was more tightly regulated in S. chilense than in S. lycopersicum. The two considered species, however, possess complementary properties and interspecific crosses may therefore be considered as a promising option for the improvement of salt-stress resistance in tomatoes.

Raw Extracts of Wild Plants Improve the Agronomic and Biochemical Quality of Tomato Fruits (Lycopersicum esculentum Mill.)

“…However, lycopene was cited in the literature for its antioxidant properties [21] [22] [23]. The results of the present study are close to those of [5] working on the effect of salt stress on the antioxidant quality of tomato fruits. The latter did show a significant correlation between the phenol content of tomato fruits and their DPPH and FRAP antiradical activities, but no correlation between these antiradical activities and the lycopene content of the fruits.…”

“…The latter did show a significant correlation between the phenol content of tomato fruits and their DPPH and FRAP antiradical activities, but no correlation between these antiradical activities and the lycopene content of the fruits. Nevertheless, as tomato is the primary source of lycopene for humans [8] [21] [5], results of this study showed that A. indica at 10% (Ai1) had a good effect on its accumulation in fruits. This extract also promotes the accumulation of sugars in the fruit.…”

“…In agronomy, fruit quality refers to its size and weight (market value), while in biochemistry, it refers to its phytomicronutrient content and its health benefits. Regarding tomato fruits, they contain a wide variety of health-promoting bioactive compounds such as phenols, lycopene, vitamin C, and β-carotene [4] [5]. These secondary metabolites, in addition to playing an important role in fruit coloration, organoleptic and nutritional quality, and allowing the plant to adapt to its fluctuating environment [6], possess antioxidant and protective properties towards certain degenerative diseases such as cancers and cardiovascular diseases [7] [4].…”

Comparison of Drought and Heat Resistance Strategies among Six Populations of Solanum chilense and Two Cultivars of Solanum lycopersicum

“…However, abiotic stress tolerance mechanisms remain largely unknown in this species compared to other wild tomato relatives [ 25 , 26 ]. Some studies investigated the physiological mechanisms underlying drought and salt tolerance in S. chilense , but they focused on one or a limited number of populations [ 23 , 25 , 27 , 28 , 29 , 30 , 31 , 32 ]. No study to date has investigated the resistance of this species to heat and the combination of drought and heat.…”

Respon Morfo-fisiologi Empat Genotipe Cabai Rawit (Capsicum frutescens L.) terhadap Cekaman Salinitas

“…Penelitian mengenai respon tanaman terhadap salinitas telah banyak dilakukan pada tanaman hortikultura dari famili Solanaceae, seperti pada kentang (Ahmed et al, 2020), terung (Sobir, et al, 2018), tomat (Martínez et al, 2020), paprika (Giorio et al, 2020), dan cabai (Mustafa et al, 2019). Akan tetapi, penelitian mengenai salinitas pada cabai berfokus pada spesies Capsicum annum L. sedangkan respon C. frutescens terhadap salinitas masih banyak berfokus pada morfologi.…”