The control plants were watered
at dusk each day. After exposing plants to water stress for
6 d, they were re-watered for another 6 d at dusk. Five
plants per treatment were arranged in a completely
randomized block design. During the experiment mean
air temperature was 20 ºC and relative humidity was
50 %. The maximum daily photosynthetic photon flux
density (PPFD) was 1 600 μmol m–2 s–1. No rainfall
occurred during the experiment.