Species interactions enhance root allocation, microbial diversity and P acquisition in intercropped wheat and soybean under P deficiency

被引:102
作者
Bargaz, Adnane [1 ,2 ,3 ]
Noyce, Genevieve L. [2 ]
Fulthorpe, Roberta [2 ]
Carlsson, Georg [1 ]
Furze, Jessie R. [2 ]
Jensen, Erik S. [1 ]
Dhiba, Driss [3 ]
Isaac, Marney E. [2 ]
机构
[1] Swedish Univ Agr Sci, Dept Biosyst & Technol, POB 103, SE-23053 Alnarp, Sweden
[2] Univ Toronto Scarborough, Dept Phys & Environm Sci, 1265 Mil Trail, Toronto, ON M1C 1A4, Canada
[3] OCP Grp, Agron & Biotechnol Unit, Direct Res & Dev, BP 118, Jorf Lasfar El Jadida, Morocco
基金
瑞典研究理事会; 加拿大自然科学与工程研究理事会;
关键词
Cereal; Legume; Phosphatase; Microbial diversity; Root distribution; T-RFLP54; INTERSPECIFIC COMPETITION; PHASEOLUS-VULGARIS; CROPPING SYSTEMS; PEA-BARLEY; PHOSPHORUS AVAILABILITY; MAIZE IMPROVES; N-2; FIXATION; GRAIN-YIELD; N USE; RHIZOSPHERE;
D O I
10.1016/j.apsoil.2017.08.011
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Belowground interactions in grain legume-cereal intercrops may improve resource acquisition and adaptation to environmental constraints such as phosphorus (P) deficiency. To advance the knowledge of belowground facilitative mechanisms involved in P-deficiency tolerance (root allocation, biochemical and microbial responses), soybean (Glycine max) and wheat (Triticum aestivum) were grown as monocrops and intercrops under P-deficiency and P-sufficiency conditions in soil-filled rhizoboxes. The hypothesis was that intercropping stimulates root microbial diversity, root biomass allocation and P-hydrolyzing acid phosphatases (APase) activity in roots under P-deficient conditions. Total root dry weight (RDW), length, and surface area significantly increased in P-deficient intercropped wheat and soybean. Greater root allocation to deeper soil layers was evident for P-deficient intercropped wheat. Shallow roots of intercropped wheat exhibited highly stimulated APase activity under P-deficient conditions while shallow roots of monocropped soybean exhibited higher APase activity in comparison to deeper roots, irrespective of P treatment. Root fungal diversity was significantly (p < 0.05) higher in intercropped wheat, and was significantly correlated with RDW, root APase activity, shoot P, and soil available P (rho = 0.24, p= 0.01). Root bacterial diversity was higher in both intercrops, and was significantly correlated with RDW and shoot N concentration. The observed shifts in root microbial diversity, root biomass allocation and APase activity provide explanatory mechanisms of relationships between rhizosphere heterogeneity and pathways for increased P acquisition in diversified crops. Advanced belowground metabolomics on root microbial communities are required to reveal the beneficial effect of root microorganisms in associations of different crop species.
引用
收藏
页码:179 / 188
页数:10
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