Fine-root traits of allelopathic rice at the seedling stage and their relationship with allelopathic potential

PeerJ

article

Jiayu Li¹  Shunxian Lin¹  Qingxu Zhang¹  Qi Zhang¹  Wenwen Hu¹  Haibin He¹ 

[1] Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University;Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University

关键词: Rice (oryza sativa);    Allelopathy;    Fine root traits;    Root exudates;    Phenolic acids;   

DOI  :  10.7717/peerj.7006

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundAllelopathic rice releases allelochemicals through its root systems, thereby exerting a negative effect on paddy weeds. This research aimed to evaluate the relationship between fine-root traits and the rice allelopathic potential at the seedling stage.MethodsTwo allelopathic rice cultivars, ‘PI312777’ and ‘Taichung Native1,’ and one non-allelopathic rice cultivar, ‘Lemont,’ were grown to the 3–6 leaf stage in a hydroponic system. Their fine roots were collected for morphological trait (root length, root surface area, root volume, and root tips number) in smaller diameter cutoffs and proliferative trait (root biomass) analysis. Their root-exudates were used for quantitative analysis of phenolic acids contents and an evaluation of allelopathic potential. Correlation analysis was also used to assess whether any linear relationships existed.ResultsOur results showed that allelopathic rice cultivars had significantly higher fine-root length having diameters 0.2 mm.DiscussionOur results implied that fine-root traits appears to be important in understanding rice allelopathy at the seedling stage. The high allelopathic potential of rice cultivars might be attributed to their higher length of fine roots <0.2 mm in diameter and more number of root tips of fine root, which could accumulate and release more allelochemicals to solutions, thereby resulting in high inhibition on target plants. The mechanisms regulating this process need to be further studied.

【 授权许可】

CC BY