Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
δ18O enrichment (‰) of water extracted from flooded soybean root tissues during 3 h of exposure of aerenchyma in the basal stem to 18O2 gas. Values are the mean (±s.e.) of three plants. Bars labelled with the same letter do not differ significantly (P < 0·05, Tukey's test).
