Different LED light spectra's and nano-chelated potassium affect the quality traits of Dolce Vita cut roses in soilless culture condition.

Roses are classified as neutral day plants, but high light and cool temperatures produce high quality flowers in roses. As light quantity, the light quality and its special spectra can affect the flower yield and quality. This research aimed to study of the effect of LED light (control (sunlight), blue and red spectra's) and nano-chelated potassium at three levels (0, 1.

Melatonin treatment maintains nutraceutical properties of pomegranate fruits during cold storage.

In this study, the mechanism activated by melatonin treatment at 100 µM for maintaining nutraceutical properties in pomegranate fruits during storage at 4 °C for 120 days was investigated. Our results showed that the higher G6PDH and 6PGDH activities in pomegranate fruits treated with melatonin may be responsible for sufficient supply of intracellular NADPH. Also, higher AA and GSH accumulation in pomegranate fruits treated with melatonin may ascribe to higher APX and GR activities coincided with lower AAO activity.

Employing exogenous melatonin applying confers chilling tolerance in tomato fruits by upregulating ZAT2/6/12 giving rise to promoting endogenous polyamines, proline, and nitric oxide accumulation by triggering arginine pathway activity.

In the present study, the mechanisms employed by exogenous melatonin applying for conferring chilling tolerance in tomato fruits during storage at 4 °C for 28 days were investigated. Conferring chilling tolerance in tomato fruits in response to exogenous melatonin applying at 100 µM may arise from upregulating SlZAT2/6/12 giving rise to triggering CBF1 gene expression. Employing higher arginine pathway activity in tomato fruits by exogenous melatonin applying demonstrating by higher endogenous polyamines accumulation arising from higher ornithine decarboxylase (ODC) and arginine decarboxylase (ADC) genes expression and enzymes activity, higher endogenous proline accumulation arising from higher pyroline 5-carboxylate synthetase (P5CS) and ornithine aminotransferase (OAT) genes expression and enzymes activity accompanying by lower proline dehydrogenase (PDH) gene expression and enzyme activity and higher endogenous nitric oxide (NO) accumulation arising from higher nitric oxide synthase (NOS) gene expression and enzyme activity may be responsible for keeping safe membrane integrity.

Melatonin treatment attenuates postharvest decay and maintains nutritional quality of strawberry fruits (Fragaria×anannasa cv. Selva) by enhancing GABA shunt activity.

Fresh strawberry fruits as perishable commodities have a short postharvest life and are prone to postharvest fungal decay. In this study, the impact of 0, 1, 10, 100 and 1000μmol/L melatonin on attenuating fungal decay and maintaining nutritional quality of strawberry fruits was investigated during storage at 4°C for 12days. Melatonin treatment at 100μmol/L triggered HO accumulation, which result from higher superoxide dismutase (SOD) activity, associated with lower catalase (CAT) and ascorbate peroxidase (APX) activities, leading to fruits with lower decay.