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Distribution of the photosynthetic related traits of 6-month-old plants of walnut under well-watered (blue), severe stress (red) conditions and overlap between them (purple) in the first-year experiment. (a) Pn, (b) Ci, (c) Pn/Ci, (d) Ci/Ca, (e) WUEi, (f) RWC, (g) FM/F0, (h) FV/F0, and (i) FV/FM in 140 Iranian walnut families. Traits are indicated on the x-axis and number of families on the y-axis. Dashed vertical lines indicate the mean of each distribution.
