Table 1.

Percent reduction (–) in Fv/Fm compared to zero values (i.e., before heat stress was imposed). Species are ranked in order of tolerance based on percent reductions in Fv/Fm as a measure of damage to the leaf photosynthetic system.

A. pseudoplatanus ‘Negenia’–18.2d–7.3c
A. pseudoplatanus ‘Spaethii’–29.0c–11.4c
A. platanoides ‘Royal Red’–33.6bc–12.8c
A. campestre–31.6bc–13.9c
A. campestre ‘Louisa Red Shine’–34.4bc–31.6b
A. platanoides ‘Princeton Gold’–36.0bc–26.4b
A. platanoides ‘Emerald Queen’–40.8b–32.0b
A. platanoides ‘Drummondii’–53.0a–47.9a
  • Numbers within a column followed by a common letter (taken from regression equations [Figure 1]) are not significantly different according to Tukey’s honest significance test (P = 0.05).