Can aluminium resistance and nitrogen utilization of rice be enhanced
simultaneously in acidic soils?
Xue Qiang Zhao and Ren Fang Shen
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008,
China, Email rfshen@issas.ac.cn
Abstract
There are many factors limiting plant growth in acidic soils. Aluminium toxicity and ammonium-nitrogen often coexist in acidic soils due to low pH and poor nitrification. Understanding the mechanisms responsible for aluminium-ammonium interaction can help improve agricultural production and maintain ecological stability in acidic soils. The effects of ammonium and nitrate on Al resistance, of aluminium on ammonium uptake, and the correlation between aluminium resistance and nitrogen utilization were investigated here. The results indicated that ammonium enhances aluminium resistance of rice compared with nitrate. Aluminium does not inhibit ammonium uptake of Al-resistant rice cultivar but does that of the Al-sensitive rice cultivar, and Al-resistant rice cultivar exhibits higher ammonium uptake rate under Al stress compared with the Al-sensitive cultivar. Al resistance in rice is positively correlated with ammonium utilization or negatively correlated with nitrate utilization. Based on these results, it is possible to increase aluminium resistance and nitrogen utilization at the same time in acidic soils through the development of Al-resistant and ammonium-preferring rice cultivars and the application of suitable types of nitrogen fertilizers.
Key Words
Ammonium, nitrate, preference, toxicity, indica, japonica.
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008,
China, Email rfshen@issas.ac.cn
Abstract
There are many factors limiting plant growth in acidic soils. Aluminium toxicity and ammonium-nitrogen often coexist in acidic soils due to low pH and poor nitrification. Understanding the mechanisms responsible for aluminium-ammonium interaction can help improve agricultural production and maintain ecological stability in acidic soils. The effects of ammonium and nitrate on Al resistance, of aluminium on ammonium uptake, and the correlation between aluminium resistance and nitrogen utilization were investigated here. The results indicated that ammonium enhances aluminium resistance of rice compared with nitrate. Aluminium does not inhibit ammonium uptake of Al-resistant rice cultivar but does that of the Al-sensitive rice cultivar, and Al-resistant rice cultivar exhibits higher ammonium uptake rate under Al stress compared with the Al-sensitive cultivar. Al resistance in rice is positively correlated with ammonium utilization or negatively correlated with nitrate utilization. Based on these results, it is possible to increase aluminium resistance and nitrogen utilization at the same time in acidic soils through the development of Al-resistant and ammonium-preferring rice cultivars and the application of suitable types of nitrogen fertilizers.
Key Words
Ammonium, nitrate, preference, toxicity, indica, japonica.
0 comments:
Posting Komentar