title: Moderate water stress prevents the postharvest decline of ascorbic acid in spinach (Spinacia oleracea L.) but not in spinach beet (Beta vulgaris L.).
abstract: BACKGROUND
  Babyleaf salads such as spinach (Spinacia oleracea L.) and spinach beet (Beta vulgaris L. subsp. cicla var. cicla) are an important dietary source of antioxidants such as ascorbic acid (vitamin C). Such compounds may be important in disease prevention in consumers but the level of these compounds in leaves frequently declines after harvest. As such, methods to maintain antioxidant levels in fresh produce are being sought.
  
  
  RESULTS
  Irrigation deficits were used to apply water stress to S. oleracea and B. vulgaris plants. This treatment prevented postharvest decline of leaf ascorbic acid content in S. oleracea but not in B. vulgaris. Ascorbic acid levels in leaves at harvest were unaffected by the treatment in both species compared to well-watered controls.
  
  
  CONCLUSIONS
  We have shown that restricted irrigation provides a viable means to maintain leaf vitamin content after harvest in S. oleracea, an important finding for producers, retailers and consumers alike. © 2015 Society of Chemical Industry.
authors.affiliation: Fresh Produce Research Centre, Crop and Environment Sciences Department, Harper Adams University, Edgmond, Shropshire, TF10 8NB, UK.|Crop and Environment Sciences Department, Harper Adams University, Edgmond, Shropshire, TF10 8NB, UK.
authors.forename: Lars M
authors.initials: LM
authors.lastname: Mogren
authors.affiliation: Fresh Produce Research Centre, Crop and Environment Sciences Department, Harper Adams University, Edgmond, Shropshire, TF10 8NB, UK.
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Beacham
authors.affiliation: Crop and Environment Sciences Department, Harper Adams University, Edgmond, Shropshire, TF10 8NB, UK.
authors.forename: John P H
authors.initials: JP
authors.lastname: Reade
authors.affiliation: Fresh Produce Research Centre, Crop and Environment Sciences Department, Harper Adams University, Edgmond, Shropshire, TF10 8NB, UK.
authors.forename: James M
authors.initials: JM
authors.lastname: Monaghan
mesh_terms: D057914:Agricultural Irrigation; D000975:Antioxidants / Q000032:analysis* / Q000378:metabolism; D001205:Ascorbic Acid / Q000032:analysis* / Q000378:metabolism; D027461:Beta vulgaris / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism; D002338:Carotenoids / Q000032:analysis / Q000096:biosynthesis / Q000378:metabolism; D002734:Chlorophyll / Q000032:analysis / Q000096:biosynthesis / Q000378:metabolism; D000077194:Chlorophyll A; D000069599:Crop Production / Q000379:methods; D063427:Food Quality; D061353:Food Storage; D006801:Humans; D009753:Nutritive Value; D010860:Pigments, Biological / Q000032:analysis / Q000096:biosynthesis / Q000378:metabolism; D018515:Plant Leaves / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism; D012034:Refrigeration; D013045:Species Specificity; D018724:Spinacia oleracea / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010860:Pigments, Biological; D002734:Chlorophyll; D002338:Carotenoids; C037184:chlorophyll b; D001205:Ascorbic Acid; D000077194:Chlorophyll A
keywords: ascorbic acid; postharvest; spinach; spinach beet; water stress