Premium
Importance of plant species and external silicon concentration to active silicon uptake and transport
Author(s) -
Liang Yongchao,
Hua Haixia,
Zhu YongGuan,
Zhang Jie,
Cheng Chunmei,
Römheld Volker
Publication year - 2006
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2006.01797.x
Subject(s) - helianthus annuus , oryza sativa , silicon , xylem , botany , chemistry , sunflower , biology , horticulture , biochemistry , organic chemistry , gene
Summary• Here, we characterized silicon (Si) uptake and xylem loading in Oryza sativa , Zea mays , Helianthus annuus and Benincase hispida in a series of hydroponic experiments. Both active and passive Si‐uptake components co‐exist in all the plants tested. The active component is the major mechanism responsible for Si uptake in O. sativa and Z. mays . • By contrast, passive uptake prevails in H. annuus and B. hispida at a higher external Si concentration (0.85 m m ), while the active component constantly exists and contributes to the total Si uptake, especially at a lower external Si concentration (0.085 m m ). • Short experiments showed that Si uptake was significantly suppressed in O. sativa and Z. mays by metabolic inhibitors or low temperature, regardless of external Si concentrations. By contrast, Si uptake in H. annuus and B. hispida was inhibited more significantly by metabolic inhibitors or low temperature at lower (for example, 0.085 m m ) than at higher (for example, 1.70 m m ) external Si concentrations. • It can be concluded that both active and passive Si‐uptake components co‐exist in O. sativa , Z. mays , H. annuus and B. hispida , with their relative contribution being dependent much upon both plant species and external Si concentrations.