Dynamics of Carbon and Nitrogen in Root Exudation and Their Relations with Root Traits in Maize

doi:10.11924/j.issn.1000-6850.casb2020-0517

Abstract

Abstract:

The aims are to study the law about root exuding carbon and nitrogen in maize and their relationships with root traits. The maize variety ‘Dika 653’ was used as material, the method of soil-hydroponic-hybrid was used to determine the morphological indicators of root, carbon and nitrogen contents in root exudation. The results showed that the specific root carbon and nitrogen exudation (EI_root-C, EI_root-N) were higher at the early growth stage than those at the late growth stage. EI_root-C and EI_root-N had a significantly positive linear correlation with specific root length, specific root surface area and specific root volume, but had a significantly negative linear correlation with C/N ratio in root. The carbon exudation per plant (EI_plant-C) and nitrogen exudation per plant (EI_plant-N) increased first and then decreased during the growth period. The accmulated root carbon and nitrogen exdation reached 15.71 g/plant and 0.75 g/plant during the maize plant growth period, respectively. There was a significant quadratic relationship between EI_plant-C and root length, root surface area, root volume, root dry weight, root shoot ratio and leaf area, while EI_plant-N only had a significant quadratic curve relationship with root shoot ratio. The carbon and nitrogien in root exudations in maize field could be estimated accroding to the relationship between root traits and root exuding carbon and nitrogien.

Key words: maize, root exudation, carbon, nitrogen, root traits

CLC Number:

S513
S31

Wan Yibing, Tang Lanlan, Zhan Ming, Shang Chunhui, Yuan Jiayi, Qin Mingguang. Dynamics of Carbon and Nitrogen in Root Exudation and Their Relations with Root Traits in Maize[J]. Chinese Agricultural Science Bulletin, 2021, 37(24): 31-38.

Figures/Tables 5

References 46

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