Details

Autor(en) / Beteiligte

• Liu, Zhao-dong
• Wang, Hai-cui
• Xu, Ren-kou

Titel

The effects of root surface charge and nitrogen forms on the adsorption of aluminum ions by the roots of rice with different aluminum tolerances

Ist Teil von

• Plant and soil, 2016-11, Vol.408 (1/2), p.43-53

Ort / Verlag

Cham: Springer

Erscheinungsjahr

2016

Quelle

Springer LINK 全文期刊数据库

Beschreibungen/Notizen

• Aim Our objectives were to compare effects of root charge properties on Al adsorption by the roots of rice that differed in Al-tolerance, and to examine effects of different nitrogen forms on charge properties of rice roots and Al adsorption. Methods Streaming potential and chemical methods were used to measure root zeta potential and investigate Al chemical forms adsorbed on the roots of rice obtained from solution culture experiments. Results Rice roots of the Al-sensitive variety Yangdao-6 carried greater negative charge than the Al-tolerant variety Wuyunjing-7, which meant the roots of Yangdao-6 adsorbed more exchangeable and complexed Al. When both rice varieties were grown in $NH_4^ + $-containing nutrient solutions, there were less functional groups and lower negative surface charge on their roots, which reduced Al adsorption compared to the rice grown in $NO_3^ - $ containing nutrient solutions. The decline in nutrient solution pH due to $NH_4^ + $ uptake by rice roots was responsible for the reduced numbers of functional groups and the lower negative surface charge on the roots compared to the rice grown in $NO_3^ - $ containing solutions. Conclusions Integrated root surface charge, as expressed by zeta potential, played an important role in Al adsorption by the roots of rice with different Al-tolerance.