Journal
NEW PHYTOLOGIST
Volume 201, Issue 2, Pages 599-609Publisher
WILEY
DOI: 10.1111/nph.12536
Keywords
biomass; diazotrophic endophytes; nitrogen (N) -fixation; phenotypic plasticity; poplar
Categories
Funding
- NSF ARRA [0930909]
- NSF IGERT [0654252]
- Div Of Industrial Innovation & Partnersh [0855690] Funding Source: National Science Foundation
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Sustainable production of biomass for bioenergy relies on low-input crop production. Inoculation of bioenergy crops with plant growth-promoting endophytes has the potential to reduce fertilizer inputs through the enhancement of biological nitrogen fixation (BNF). Endophytes isolated from native poplar growing in nutrient-poor conditions were selected for a series of glasshouse and field trials designed to test the overall hypothesis that naturally occurring diazotrophic endophytes impart growth promotion of the host plants. Endophyte inoculations contributed to increased biomass over uninoculated control plants. This growth promotion was more pronounced with multi-strain consortia than with single-strain inocula. Biological nitrogen fixation was estimated through N-15 isotope dilution to be 65% nitrogen derived from air (Ndfa). Phenotypic plasticity in biomass allocation and branch production observed as a result of endophyte inoculations may be useful in bioenergy crop breeding and engineering programs.
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