期刊
JOURNAL OF PLANT ECOLOGY
卷 8, 期 4, 页码 436-448出版社
OXFORD UNIV PRESS
DOI: 10.1093/jpe/rtu025
关键词
arbuscular mycorrhizal fungi; resource allocation; rice; grain yield; fertilizer
资金
- National Natural Science Foundation of China [51179041]
- Major Science and Technology Program for Water Pollution Control and Treatment [2013ZX07201007]
- National Creative Research Group from the National Natural Science Foundation of China [51121062]
- State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, China (HIT) [2011TS07]
- Natural Science Foundation of Hei Longjiang Province, China [E201206]
- Special Fund for Science and Technology Innovation of Harbin [2012RFLXS026]
- Australian Research Council Centre of Excellence in Plant Energy Biology [CE140100008]
Aims Our study quantified the combined effects of fertilization and inoculation with arbuscular mycorrhizal fungi (AMF) on grain yield and allocation of biomass and nutrients in field-grown rice (Oryza sativa L.). Methods A two-factor experiment was conducted at a field site in northeast of China (in Shuangcheng, Heilongjiang Province, Songhua River basin): six nitrogen-phosphorus-potassium fertilizer levels were provided (0, 20, 40, 60, 80 and 100% of the local norm of fertilizer supply), with or without inoculation with Glomus mosseae. At maturity, we quantified the percentage of root length colonization by AMF, grain yield, shoot: root ratios, shoot N and P contents and nutrients allocated to panicles, leaves and stems. Important Findings As expected, inoculation resulted in greatly increased AMF colonization, which in turn led to higher shoot: root ratios and greater shoot N contents. Shoot: root ratios of inoculated rice increased with increasing fertilization while there was a significant interaction between fertilization and inoculation on shoot: root ratio. Additionally, AMF inoculation increased panicle: shoot ratios, panicle N: shoot N ratios and panicle P:shoot P ratios, especially in plants grown at low fertilizer levels. Importantly, inoculated rice exhibited higher grain yield, with the maximum improvement (near 62%) at the lower fertilizer end. Our results showed that (i) AMF-inoculated plants conform to the functional equilibrium theory, albeit to a reduced extent compared to non-inoculated plants and (ii) AMF inoculation resulted in greater allocation of shoot biomass to panicles and increased grain yield by stimulating N and P redistribution to panicles.
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