Articles
PHOTOSYNTHETIC RESPONSE OF STRAWBERRY LEAVES TO CHANGING TEMPERATURES
Article number
838_11
Pages
73 – 76
Language
English
Abstract
Photosynthesis is an important process for crop productivity.
Net photosynthesis (Pnet) of leaves of two strawberry cultivars, grown in the field under plastic tunnels was measured during harvest and related to light intensity, leaf temperature, and leaf age.
Light saturation of strawberry leaves was reached at a light intensity of about 1400 mol photons m-2 s-1. At light saturation, Pnet of the leaves increased with increasing temperatures and was highest at about 30°C with 18 and 16 μmol CO2 m-2 s-1 at mid-harvest for Marmolda and Darselect respectively.
With further increasing temperatures, Pnet decreased.
However, at 40°C, Pnet was still considerable with about 10 μmol CO2 m-2 s-1 indicating that photosynthesis of strawberry leaves seems to be adapted to hot conditions.
Leaf age had a considerable influence on Pnet. The youngest fully developed leaf of a plant was compared to 10, 20, and 30 days older leaves at different harvest periods.
The older leaves had a 24% or 12% higher Pnet than the youngest fully developed leaf for Marmolada and for Darselect respectively.
However, the response of Pnet to temperature and light intensity was not influenced by leaf age.
Net photosynthesis (Pnet) of leaves of two strawberry cultivars, grown in the field under plastic tunnels was measured during harvest and related to light intensity, leaf temperature, and leaf age.
Light saturation of strawberry leaves was reached at a light intensity of about 1400 mol photons m-2 s-1. At light saturation, Pnet of the leaves increased with increasing temperatures and was highest at about 30°C with 18 and 16 μmol CO2 m-2 s-1 at mid-harvest for Marmolda and Darselect respectively.
With further increasing temperatures, Pnet decreased.
However, at 40°C, Pnet was still considerable with about 10 μmol CO2 m-2 s-1 indicating that photosynthesis of strawberry leaves seems to be adapted to hot conditions.
Leaf age had a considerable influence on Pnet. The youngest fully developed leaf of a plant was compared to 10, 20, and 30 days older leaves at different harvest periods.
The older leaves had a 24% or 12% higher Pnet than the youngest fully developed leaf for Marmolada and for Darselect respectively.
However, the response of Pnet to temperature and light intensity was not influenced by leaf age.
Authors
C. Carlen, A.M. Potel, A. Ançay
Keywords
cultivar, Fragaria x ananassa, harvest period, leaf age, light intensity
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