Abstract:

Based on the experimental studies on crop root exudates published in Chinese from 2000 to 2021 in the databases of CNKI, CQVIP and Wanfang, the hotspot of crop root exudates studies was preliminarily explored. It was shown that 42% of the published studies focused on wheat, soybeans, maize, rice, faba beans. Crops, microorganisms and soil were the main factors involved in the interaction between external environment and root exudates. Interaction studies mainly focused on the influence of crop root exudates on the environment, and the response of root exudates to the environment. Based on the analysis accuracy of crop root exudates, relative studies could be divided into three levels, namely, total detection (39% of the total studies), functional component analysis (50% of the total studies) and total component analysis (11% of the total studies). Although the types of large molecular weight compounds such as lipids, alkanes and alcohols in crop root exudates accounted for a relatively higher proportion of all compounds (41%), the number of studies on low molecular weight and a few types of primary metabolites such as acids, amino acids and sugars accounted for a relatively higher proportion (24%). In general, grain crops are the focus of root exudates research in China’s agricultural system. The full analysis of root exudates is still in the early development stage. The interaction between the functions of acids, amino acids and primary metabolites of sugars in crop root exudates and the external environment is the hot topic at present.

Key words: agricultural system, root exudates, crops, external environment, statistical analysis