Crops ›› 2021, Vol. 37 ›› Issue (6): 1-8.doi: 10.16035/j.issn.1001-7283.2021.06.001

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Effects of Root Exudates on Key Processes of Soil Nitrogen Cycling: A Review

Wang Rui(), Chen Shiyong, Chen Zhiqing, Cui Peiyuan, Lu Hao, Yang Yanju, Zhang Haipeng(), Zhang Hongcheng()   

  1. Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Innovation Center of Rice Cultivation Technology in Yangtza River Valley of Ministry of Agriculture and Rural Affairs, Yangzhou 225009, Jiangsu, China
  • Received:2021-04-27 Revised:2021-07-05 Online:2021-12-15 Published:2021-12-16
  • Contact: Zhang Haipeng,Zhang Hongcheng E-mail:ruiwang0812@163.com;hpzhang@yzu.edu.cn;hczhang@yzu.edu.cn

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Abstract:

Root exudates play an important role in soil nitrogen cycle, N2O emissions, and plants nitrogen use efficiency, and it is also at the forefront of soil science, plant nutrition, environmental science and interdisciplinary. In order to understand the effects of root exudates on the nitrogen cycle in the soil, this position paper presents the fractions and the methods to study root exudates. The effects of root exudates on the most important nitrogen conversion processes in soils were investigated. The ability to suppress soil nitrification, denitrification and N2O emissions through the release of exudates from plant roots is highlighted and the further prospects are suggested. This work will provide some references for the investigation of the nitrogen cycle mechanism of interaction effects between soil-plant-microorganisms to further improve the utilization rate of nitrogen fertilizer and reduce the environmental pollution caused by nitrogen fertilizer.

Key words: Root exudates, Nitrogen, Mineralization and immobilization, Nitrification, Denitrification, N2O emission

Fig.1

Inhibition of root exudates on soil nitrification AMO: ammonia monooxygenase; HR: hydroxylamine reductase; NXR: nitrite oxidoreductase; AOA: ammonia-oxidizing archaea; AOB: ammonia-oxidizing bacteria; NOB: nitrite oxidizing bacteria"

Table 1

Nitrification inhibitors and its function ways in root exudates"

根系分泌物成分
Root exudate component		 植物
Plant		 抑制途径
Inhibition pathway		 参考文献
Reference
苯丙酯MHPP 玉凤花 AMO [48]
亚油酸Linoleic acid 玉凤花 AMO和HR [49]
亚麻酸Linolenic acid 高梁 AMO和HR [52-53]
脂肪醇1,9-decanediol 水稻 AMO [59-60]
脂肪酸化合物Sorgoleone 高粱 AMO和HR [61]
樱花素Sakuranetin 高粱 AMO和HR [62]
柠檬烯Limonene 西黄松 AMO [63]
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