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Open AccessArticle

Growing Conditions Affect the Phytochemical Composition of Edible Wall Rocket (Diplotaxis erucoides)

1
Instituto de Conservación y Mejora de la Agrodiversidad Valenciana (COMAV), Universitat Politècnica de València, 46022 Valencia, Spain
2
Facultade de Ciências Exatas e da Engenharia, Universidade da Madeira, 9000-082 Funchal, Portugal
*
Author to whom correspondence should be addressed.
Agronomy 2019, 9(12), 858; https://doi.org/10.3390/agronomy9120858
Received: 20 November 2019 / Revised: 4 December 2019 / Accepted: 6 December 2019 / Published: 7 December 2019
Wall rocket (Diplotaxis erucoides) is a wild vegetable with the potential to become a crop of high antioxidant quality. The main bioactive compounds include ascorbic acid (AA), sinigrin, and a high content of total phenolic compounds (TP). It also accumulates nitrates. Since these compounds are affected by environmental conditions, adequate crop management may enhance its quality. Eleven accessions of wall rocket were evaluated under field and greenhouse conditions during two cycles (winter and spring) and compared to Eruca sativa and Diplotaxis tenuifolia crops. The three species did not differ greatly. As an exception, sinigrin was only identified in wall rocket. For the within-species analysis, the results revealed a high effect of the growing system, but this was low among accessions. The highest contents of AA and TP were obtained under field conditions. In addition, the levels of nitrates were lower in this system. A negative correlation between nitrates and antioxidants was determined. As a counterpart, cultivation in the field–winter environment significantly decreased the percentage of humidity (87%). These results are of relevance for the adaptation of wall rocket to different growing conditions and suggest that the field system enhances its quality. The low genotypic differences suggest that intra-species selections in breeding programs may consider other aspects with greater variation. View Full-Text
Keywords: ascorbic acid; Diplotaxis erucoides; field; greenhouse; new crops; nitrates; sinigrin ascorbic acid; Diplotaxis erucoides; field; greenhouse; new crops; nitrates; sinigrin
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Guijarro-Real, C.; Adalid-Martínez, A.M.; Aguirre, K.; Prohens, J.; Rodríguez-Burruezo, A.; Fita, A. Growing Conditions Affect the Phytochemical Composition of Edible Wall Rocket (Diplotaxis erucoides). Agronomy 2019, 9, 858.

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