303-10 Oxygen, Carbon and Nitrogen Isotopes Composition of Cultivated and Wild Soybean.
Poster Number 516
To characterize and compare isotope signatures in cultivated and wild soybean, diversity panels of 83 cultivated soybean plant introductions (PIs) and 83 wild soybean genotypes were grown in field experiments in 2013 and 2014. Shoot tissue isotope analyses from the 2013 season revealed δ18O, δ13C and δ15N values of cultivated soybean ranging from 20.1 to 23.6‰, -32.7 to -26.7‰, and 1.6 to 5.9‰, respectively, and averages of 22.1 (δ18O), -28.6 (δ13C), and 4.1 ‰ (δ15N). The ranges of isotope signatures for the wild genotypes were 21.3 to 26.0‰ (δ18O), -32.5 to -26.3‰ (δ13C), and 2.7 to 9.1‰ (δ15N), with averages of 23.5 (δ18O), -27.6 (δ13C) and 6.3‰ (δ15N). While two populations had similar ranges of δ13C signature, overlapping set broader ranges in δ18O and δ15N were observed in wild compared to cultivated soybean. Thus, preliminary results suggest that wild soybean genotypes may encompass diversity in δ18O and δ15N signatures that may be useful for soybean breeders.