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Ammonium improves iron nutrition by decreasing leaf apoplastic pH of sunflower plants(Helianthus annuus L.cv.Frankasol)

查看全文 作　　者：ZOU Chunqin & ZHANG Fusuo Key Laboratory of Plant-Soil Interactions, Ministry of Education;Key Laboratory of Plant Nutrition, Ministry of Agriculture;of China Department of Plant Nutrition, China Agricultural University, Beijing 100094, China Correspondence should be addressed to Zhang Fusuo (e-mail: zhangfs@ cau.edu.cn) 高影响力作者 出　　处：《Chinese Science Bulletin》索引2003年第48卷第20期,共6页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant No.30000103);the Fund of Doctoral Station ofthe Ministry of Education of China(Grant No.20010019014). 摘　　要：The effect of nitrogen form on pH and concentration of soluble iron (Fe) in leaf apoplast was investigated in hydrophonically grown sunflower plants (Helianthus annuus L. cv. Frankasol), and the mechanism underlying the improved Fe nutrition by ammonium (NH4) supply was also elucidated. Ammonium supply ameliorated Fe nutrition of plants grown without Fe through decreasing apoplastic pH and increasing soluble Fe concentration in apoplastic fluid of young leaves. The soluble Fe concentration in apoplastic fluid and cell sap of young leaves, and xylem exudates of NH4 fed-plants was higher than that of nitrate (NO3) fed-plants, and no typical Fe-deficiency chlorosis in young leaves was observed in NH4 fed plant without Fe supply. The apoplastic pH was 6.15 and 5.94 in young leaves of Fe-deficient plants fed respectively with NO3 and NH4, while in Fe-sufficient plants, the apoplastic pH was 6.43 with NO3, and 5.50 with NH4 supply. In primary leaves, the apoplastic pH was around 6.25 irrespective of nitrogen form and Fe supply. The pH of xylem exudate was 5.72 in Fe-deficient plants fed with NO3 and 5.49 with NH4. Iron nutrition increased the pH of xylem exudate by 0.27 and 0.16 unit under NO3 and NH4 supply respectively. 关 键 词：向日葵 铁营养学 非原质体 pH值 氮 铵 赋存形态 植物生理学
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