Ammonium reduces oxalate accumulation in different spinach (Spinacia oleracea L.) genotypes by inhibiting root uptake of nitrate

被引:14
作者
Liu, Xiaoxia [1 ]
Lu, Lingli [1 ,2 ]
Chen, Qiuhui [1 ]
Ding, Wenya [3 ]
Dai, Peibin [1 ]
Hu, Yan [1 ]
Yu, Yan [1 ]
Jin, Chongwei [1 ,2 ]
Lin, Xianyong [1 ,3 ]
机构
[1] Zhejiang Univ, Coll Nat Resource & Environm Sci, MOE Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China
[2] Zhejiang Univ, Coll Environm & Resource Sci, Key Lab Subtrop Soil Sci & Plant Nutr Zhejiang Pr, Hangzhou 310058, Zhejiang, Peoples R China
[3] Zhejiang Univ, Agr Expt Stn, Hangzhou 310058, Zhejiang, Peoples R China
基金
国家高技术研究发展计划(863计划);
关键词
Ammonium; Genotype; Nitrate; Oxalate accumulation; Spinach; ASCORBIC-ACID; NITROGEN-SOURCE; PLANTS; ASSIMILATION; REDUCTION; NUTRIENTS; KINETICS; NITRITES; ATRIPLEX; TISSUES;
D O I
10.1016/j.foodchem.2014.06.122
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Excessive accumulation of oxalate negatively affects nutritional value of many vegetables, such as spinach (Spinacia oleracea L). Mixed solution of ammonium and nitrate could effectively reduce oxalate accumulation, while the mechanism involved remains unknown. High (Heizhenzhu) and low (Weilv) oxalate-accumulated spinach genotypes were used in this study to investigate the association of oxalate accumulation and root uptake of nitrogen. Exposure of increasing nitrate or mixed-nitrogen (nitrate:ammonium = 1:1) significantly increased leaf total and soluble oxalate contents. In contrast, increasing ammonium did not result in elevation of leaf oxalate. Correlation analysis confirmed that leaf oxalate accumulation was positively associated with root uptake of nitrate but not ammonium. Moreover, addition of ammonium significantly reduced nitrate uptake rate, and subsequently decreased leaf oxalate accumulation. The results suggest that oxalate synthesis in spinach leaves is associated with its root uptake of nitrate, and ammonium is able to reduce oxalate accumulation by inhibiting uptake of nitrate. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:312 / 318
页数:7
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