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.
Gas exchange parameters performance of 45 days old plants including under N-optimum and stress conditions. The mean values (n = 5) and standard deviations, with statistically significant differences indicated by students T-test at *P < 0.05, **P < 0.01 and ***P < 0.001 (Pn: net photosynthesis; gs: stomatal conductance; Ci: inter-cellular CO2 concentration and Tr: transpiration rate)
