Heating at the
bottom of the chamber increased the temperature and RH was
maintained at 60–70% by placing a wet carpet underneath the
plants. The photosynthetic photon flux density (PPFD) at the plant
canopy level was 60–70 mol m−2 s−1 (LI-250A Quantum sensor,
LI-COR, Lincoln, NE, USA) during the supplemental light period