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Title: Evidence for foliar endophytic nitrogen fixation in a widely distributed subalpine conifer

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.13850· OSTI ID:1251058
 [1];  [1];  [2];  [3];  [4];  [4];  [5]
  1. Univ. of California Merced, Merced, CA (United States). Sierra Nevada Research Inst.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
  3. Univ. of California Merced, Merced, CA (United States). School of Natural Sciences and Life and Environmental Sciences
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division
  5. Univ. of California Merced, Merced, CA (United States). Sierra Nevada Research Inst., School of Natural Sciences and Life and Environmental Sciences

Coniferous forest nitrogen (N) budgets indicate unknown sources of N. A consistent association between limber pine (Pinus flexilis) and potential N 2 -fixing acetic acid bacteria (AAB) indicates that native foliar endophytes may supply subalpine forests with N. To assess whether the P. flexilis-AAB association is consistent across years, we re-sampled P. flexilis twigs at Niwot Ridge, CO and characterized needle endophyte communities via 16S rRNA Illumina sequencing. To investigate whether endophytes have access to foliar N 2 , we incubated twigs with 13 N 2 -enriched air and imaged radioisotope distribution in needles, the first experiment of its kind using 13 N. We used the acetylene reduction assay to test for nitrogenase activity within P. flexilis twigs four times from June to September. We found evidence for N 2 fixation in P. flexilis foliage. N 2 diffused readily into needles and nitrogenase activity was positive across sampling dates. We estimate that this association could provide 6.8-13.6 μg N m -2 d -1 to P. flexilis stands. AAB dominated the P. flexilis needle endophyte community. We propose that foliar endophytes represent a low-cost, evolutionarily stable N 2 -fixing strategy for long-lived conifers. This novel source of biological N 2 fixation has fundamental implications for understanding forest N budgets.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Univ. of Colorado, Boulder, CO (United States). Mountain Research Station; National Science Foundation (NSF)
Grant/Contract Number:
AC52-07NA27344; IOS-1321807; AC02-05CH11231
OSTI ID:
1251058
Alternate ID(s):
OSTI ID: 1440924
Report Number(s):
LLNL-JRNL-671997
Journal Information:
New Phytologist, Vol. 210, Issue 2; ISSN 0028-646X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 90 works
Citation information provided by
Web of Science

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