Table 4 Quantum efficiency of photochemical reaction in PSII and ETR electron transport rate in lime and maple leaves in relation to the seasons of the year.

From: The relationship between physiological and mechanical properties of Acer platanoides L. and Tilia cordata Mill. leaves and their seasonal senescence

The tree species

The season of the year

F/Fm′

Y (II)

ETR

Lime (Tilia)

spring

0.337a

0.663a

6.17a

Maple (Acer)

spring

0.285b

0.715b

2.27a

Lime

summer

0.413c

0.587c

53.56b

Maple

summer

0.331a

0.669a

18.97c

Lime

autumn

0.572d

0.428d

5.96a

Maple

autumn

0.674e

0.326e

0.35a

  1. a–cValues marked with different letters (in columns) indicate significant differences at p ≤ 0.05. F/Fm′ - min/max fluorescence of the sample adapted to light; Y(II) - quantum efficiency of photochemical reaction in PSII, value approximating the efficiency of photosynthesis; ETR – electron transport rate.
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