Figure 5. Mean water potential at which 50% of the xylem area is embolized (P50) ± S.E. of tomato lamina, petioles, petals, peduncles, and stems. Peduncles show significantly greater cavitation resistance than the other organs. Letters indicate significant differences (p<0.05) in the cavitation vulnerabilities of organs. *Stem P50 determined from separate data and not included in post-hoc tests.