Abstract
The walnut leaves and the green walnut husk are been widely used in folk medicine. These vegetal materials have been reported as a source of bioactive molecules such as the phenolic compounds. In this research, there were analysed different quality parameters afferent to several walnut varieties, harvested from the germplasm collection located at S.C.D.P. Vâlcea, Romania. Romanian cultivars ‘Jupâneşti’, ‘Valrex’ and ‘Valmit’ and French one ‘Franquette’ were analyzed. The variation in bioactive compounds content from the walnut leaves and walnut husk at different developmental stages (from June to September) was investigated. The results showed that the content in polyphenols, flavonoids and tannins has significantly increased until the ripening stage, after that a decrease of the values of these parameters follows. Greater values of the three parameters were also observed at walnut leaves and green walnut husk of cultivars attacked by walnut blight, caused by the bacterium Xanthomonas arboricola pv. juglandis (Xaj). The findings of this study reveal the mode of variation in the content of polyphenols, flavonoids and tannins during the growing season of the walnut leaves and green walnut husk, emphasizing also the influence of Xaj. The results obtained demonstrated the potential of the walnut leaves and the green walnut husk as an economical source of antioxidant and antimicrobial agents.
 
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 In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 4, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue.
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Highlights
The common walnut (Juglans regia L.), known as English or Persian walnut, considered one of the oldest tree species, is important both from both economically and nutritionally, due to the quality of its fruits, the superior quality of the wood and its other organs
The evolution in time of the polyphenolic compounds content at the walnut leaves and the green walnut husk, both on healthy vegetal materials and attacked by Xanthomonas arboricola pv. juglandis (Xaj) is shown in Figs. 1 to 4
In 15 June 2018, the content of polyphenolic compounds was found between 2510 mg gallic acid equivalent/100 g of vegetal material ‘Franquette’ cv. and 7632 mg gallic acid equivalent/100 g of vegetal material ‘Jupâneşti’ cv
Summary
The common walnut (Juglans regia L.), known as English or Persian walnut, considered one of the oldest tree species, is important both from both economically and nutritionally, due to the quality of its fruits, the superior quality of the wood and its other organs. The walnut provides the raw material for many branches of industry. It is appreciated for its wood with high quality, having high strength, plasticity and finesse, being used in the manufacture of the luxury furniture, the sculpture, in the aircraft and car industry. The walnut is used as a medicinal plant. The walnut leaves juice is used as a vermifuge, as a tonic, as an ointment for varicose veins, as urine disinfectant. The homeopathy followers recommend the mesocarp for the treatment of acne, irritation, vomiting
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