The mechanism by which rice root secretions 1,9-glycol inhibit nitrification.

Nitrification is the main way of nitrogen conversion in farmland, and it is closely related to nitrogen loss and utilization.
the existence of nitrogen in the form of NH4 plus is one of the keys to improve crop nitrogen utilization.
because synthetic nitrification inhibitors are expensive, their performance is unstable in different soil types, and there are ecological environment and food safety hazards, it is necessary to develop bionitridide inhibitors (BNIs) from plant sources.
, BNIs have only been reported from Brachiaria humidicola and sorghum.
Using self-created root secretion in-place collection system and GC-MS separation identification technology, shi Weiming's team of Nanjing Soil Research Institute of the Chinese Academy of Sciences identified a new type of BNIs-1,9-yuan for the first time from rice, an important food crop, by measuring the activity of root secretions of 19 indica and indica varieties. Glycol, found that it mainly inhibits nitrification by inhibiting the process of ammonia monooxygenase (AMO), and it is clear that 1,9-glycol is a natural substance secreted by rice roots, which has a significant inhibitory effect on the nitrification effect of tidal ash soil, and the inhibitory effect is significantly greater than that of dicyanide (DCD) commonly used in agricultural and animal husbandry production.
further, through the 15N isotope marker experiment of 19 rice varieties, it is revealed that there is a close relationship between bionitrist inhibition effect, 1,9 glycol content and nitrogen absorption and utilization efficiency of rice varieties.
the above-mentioned research, published in New Botanists (Sun et al., 2016, 212:646-656), has been highly evaluated by international peers as providing new ideas and entry points for rice genetic/breeding and nitrogen fertilizer management in rice fields.
This study is of great theoretical significance and application value for deepening plant-microorganism interoperability to regulate soil nitrogen conversion, improving crop nitrogen utilization, reducing nitrogen loss and greenhouse gas emissions, guiding nitrogen fertilizer reduction and efficiency reduction, and realizing zero growth of fertilizer nitrogen.
research results have also been more than 100 domestic and foreign media and institutions of extensive attention and coverage.
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