2.4.3. Net photosynthesis rate (Pn)
Net photosynthesis rate (Pn) was made out using a photosynthesis
instrument (LI-6400, LI-COR, USA). PPFD was set to measure
at 800 mol m−2 s−1, and the experimental conditions such as leaf
temperature, CO2 concentration and relative humidity (RH) were
23
±
1 ◦C, 380
±
5 L L−1 and 60–70%, respectively. The Pn experiment
was repeated 3 times with 3 plants in each treatment.