Effect of ammonium : nitrate nutrient ratio on nitrate and glucosinolate contents of hydroponically-grown rocket salad (Eruca saliva Mill.)(Soil Chemistry and Mineralogy)
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概要
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The effect of the ammonium-nitrogen (NH^+_4-N) to nitrate-nitrogen (NO^-_3-N) ratio on NO^-_3 and glucosinolate (GSL) contents in rocket salad (Eruca sativa Mill.) was investigated. Rocket salad plants were provided with five nutrient solutions with the same total nitrogen (N) level (10mmol L^<-1>), but with different (0, 25, 50, 75 and 100) percent mole ratios of NH^+_4 to NO^-_3-nitrogen (PMR-N). Rocket growth (height and dry weight [DW] of the leaves and roots) was severely inhibited at a PMR-N of 100. The leaves were withered and showed chlorotic and necrotic phenomena from NH^+_4 toxicity. Leaf NO^-_3 and sulfate (SO^2-_4) contents sharply decreased with increasing PMR-N. Six GSLs including glucoraphanin, 4-(β-D-glucopyranosyldisulfanyl) butyl GSL, glucoerucin, glucobrassicin, dimeric 4-mercaptobutyl GSL and 4-methoxyglucobrassicin were identified from rocket salad by their retention times using high-pressure liquid chromatography and confirmed using electrospray ionization mass spectrometry (ESI-MS). An unknown compound (m/z 414 as desulfo-GSL) only appeared at a PMR-N of 100. This compound together with the other GSLs appears to be involved in detoxification of NH^+_4 toxicity. Total GSL content in the leaves ranged from 9 to 13μmol kg^<-1> DW, with the highest content occurring at a PMR-N of 50 and the lowest value at a PMR-N of 100. In contrast, total GSL content in the roots ranged from 31 to 48 (μmol kg^<-1> DW, with the lowest value occurring at PMR-Ns of 50 and 100. The four GSLs glucoraphanin, 4-(β-D-glucopyranosyldisulfanyl)butyl GSL, glucoerucin and dimeric 4-mercaptobutyl GSL were the major compounds in the leaves, whereas glucoerucin was found in great quantities in the roots.
- 社団法人日本土壌肥料学会の論文
著者
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Kim Sun-ju
Memuro Upland Farming Research Station National Agricultural Research Center For Hokkaido Region
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Kawaharada Chiami
Obihiro University of Agriculture and Veterinary Medicine
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ISHII Gensho
National Agricultural Research Center for Hokkaido Region
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KIM Sun-Ju
Department of Upland Agriculture, National Agricultural Research Center for Hokkaido Region (NARCH)
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ISHII Gensho
Department of Crop Breeding, National Agricultural Research Center for Hokkaido Region
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Kim S‐j
Chiba Univ. Chiba Jpn
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Kim Sun-ju
Department Of Crop Breeding National Agricultural Research Center For Hokkaido Region
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Kim Sun-ju
Graduate School Of Science And Technology Chiba University
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Ishii Gensho
Department Of Crop Breeding National Agricultural Research Center For Hokkaido Region
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Kim Sun-ju
Department Of Upland Agriculture National Agricultural Research Center For Hokkaido Region (narch)
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Kim Sun‐ju
Memuro Upland Farming Research Station National Agricultural Research Center For Hokkaido Region
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