This early gl and Pn response suggests that porometric and/or photosynthetic changes are
reliable bio-indicators of the altered behaviour caused by flooding in apricot plants. The lowest gl and
Pn, and highest R(ps) values occurred with more prolonged flooding (6 days), when a decrease in
leaf water potential (l) and leaf turgor was noted, together with epinasty, which in Búlida/RF plants
led to a decrease in l to –6.0 MPa, and the death of all plants. These results indicate Búlida apricot
plants grafted onto Pollizo prune rootstock is a more appropriate combination than Búlida/Real Fino
to resist occasional soil flooding situations.