Isotopic discrimination associated with symbiotic nitrogen fixation in stylo (Stylosanthes hamata L.) and cowpea (Vigna unguiculata L.)

A glasshouse study was carried out to determine the isotopicdiscrimination (B values) and the isotopic fractionation factors (β)associated with symbiotic nitrogen fixation in stylo (Stylosantheshamata L.) and cowpea (Vigna unguiculata L.Walp). The B values are required to improve the accuracy of est...

Full description

Saved in:
Bibliographic Details
Published in:Nutrient cycling in agroecosystems 2002-01, Vol.62 (1), p.11-14
Main Authors: Nguluu, S N, Probert, ME, McCown, R L, Myers, RJK, Waring, SA
Format: Article
Language:English
Subjects:
Cowpeas
Fractionation
Greenhouses
Isotope fractionation
Isotopes
Nitrogen
Nitrogen fixation
Nitrogenation
Shoots
Vigna unguiculata
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A glasshouse study was carried out to determine the isotopicdiscrimination (B values) and the isotopic fractionation factors (β)associated with symbiotic nitrogen fixation in stylo (Stylosantheshamata L.) and cowpea (Vigna unguiculata L.Walp). The B values are required to improve the accuracy of estimates ofnitrogen fixation based on the differences in the natural abundance of15N between nitrogen fixing and non-fixing plants. The B values ofplants grown in nitrogen free media for stylo were −1.60, 82 days after planting (DAP) and −1.86, 98 DAP and −1.48, 49DAP and −1.51 for cowpea shoots 73 DAP. Theisotopic fractionation factors for stylo and cowpea were 1.0016, 82DAP and 1.0019, 98 DAP and 1.0018, 49 DAPand 1.0015, 73 DAP, respectively.
ISSN:1385-1314
1573-0867
DOI:10.1023/A:1015440906428