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The effect of salt stress (200 mM NaCl for 28 days) on physiological characteristics of Hibiscus rosa-sinensis, such as abscisic acid (ABA) content, electrolyte leakage, and photochemical efficiency in leaves, and its influence on biomass production, anthocyanin composition, and color expression of flowers were evaluated. Salinity significantly increased electrolyte leakage and ABA content in leaves and reduced the flower fresh weight. Chlorophyll fluorescence parameters were lower in salt stress condition, compared to control. Moreover, salt stress negatively affected the content of anthocyanins (mainly cyanidin-3-sophoroside), which resulted in a visually perceptible loss of color. The detailed anthocyanin composition monitored by HPLC-DAD-MS and the color variations by digital image analysis due to salt stress showed that the effect was more noticeable at the basal portion of petals. A forward stepwise multiple regression was performed for predicting the content of anthocyanins from appearance characteristics obtained by image analysis, reaching R-square values up to 0.90.
Depósi o de in es igación de la Uni e sidad de Se illa h ps://idus.us.es/ "This documen is he Accep ed Manusc ip e sion o a Published Wo k ha appea ed in inal o m in Jou nal o Ag icul u al and Food Chemis y, copy igh © Ame ican Chemical Socie y a e pee e iew and echnical edi ing by he publishe . To access he inal edi ed and published wo k see h ps://doi.o g/10.1021/j 502444u ."