Compost as a soil supplement increases the level of antioxidant compounds and oxygen radical absorbance capacity in strawberries.
Compost as a soil supplement significantly enhanced levels of ascorbic acid (AsA) and glutathione (GSH) and ratios of AsA/dehydroascorbic acid (DHAsA) and GSH/oxidized glutathione (GSSG) in fruit of two strawberry (Fragaria x ananassa Duch.) cultivars, Allstar and Honeoye. The peroxyl radical (ROO(*)) as well as the superoxide radical (O(2)(*)(-)), hydrogen peroxide (H(2)O(2)), hydroxyl radical (OH(*)), and singlet oxygen ((1)O(2)) absorbance capacity in strawberries increased significantly with increasing fertilizer strength and compost use. The planting medium (compost) x fertilizer interaction for phenolics and flavonoids was significant. Fruit from plants grown in full-strength fertilizer with 50% soil plus 50% compost and 100% compost yielded fruit with the highest levels of phenolics, flavonol, and anthocyanin content. A positive relationship between antioxidant activities and contents of AsA and GSH and ratios of AsA/DHAsA and GSH/GSSG existed in fruit of both strawberry cultivars. Correlation coefficients for the content of antioxidant components versus antioxidant activity [against ROO(*), O(2)(*)(-), H(2)O(2), OH(*), or (1)O(2)] ranged from r( )()= 0.7706 for H(2)O(2) versus GSH/GSSH in cv. Allstar to r = 0.9832 for O(2)(*)(-) versus total flavonoids in cv. Allstar.
Fruit Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, US Department of Agriculture, Beltsville, Maryland 20705-2350, USA. wangs@ba.ars.usda.gov
Shiow Y
SY
Wang
Hsin-Shan
HS
Lin
D000872:Anthocyanins / Q000032:analysis; D000975:Antioxidants / Q000032:analysis* / Q000737:chemistry*; D001205:Ascorbic Acid / Q000032:analysis; D005308:Fertilizers; D005419:Flavonoids / Q000032:analysis; D031985:Fragaria / Q000737:chemistry* / Q000254:growth & development; D005638:Fruit / Q000737:chemistry*; D005978:Glutathione / Q000032:analysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry; D010545:Peroxides / Q000737:chemistry; D010636:Phenols / Q000032:analysis; D017382:Reactive Oxygen Species / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D013481:Superoxides / Q000737:chemistry
D000872:Anthocyanins; D000975:Antioxidants; D005308:Fertilizers; D005419:Flavonoids; D010545:Peroxides; D010636:Phenols; D017382:Reactive Oxygen Species; D012987:Soil; D013481:Superoxides; C049375:perhydroxyl radical; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D005978:Glutathione; D001205:Ascorbic Acid