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首页> 外文期刊>Acta Horticulturae >Photosynthetic response of strawberry leaves to changing temperatures.
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Photosynthetic response of strawberry leaves to changing temperatures.

机译：草莓叶片对温度变化的光合响应。

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摘要

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 micro mol photons m-2 s-1. At light saturation, Pnet of the leaves increased with increasing temperatures and was highest at about 30 degrees C with 18 and 16 micro mol CO2 m-2 s-1 at mid-harvest for 'Marmolda' and 'Darselect' respectively. With further increasing temperatures, Pnet decreased. However, at 40 degrees C, Pnet was still considerable with about 10 micro mol 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.
机译：光合作用是提高作物生产力的重要过程。在收获过程中测量了在塑料隧道下田间生长的两个草莓品种叶片的净光合作用（P net ），并与光强，叶片温度和叶片年龄有关。草莓叶片在约1400 micro mol光子m -2 s -1 的光强度下达到了光饱和。在光饱和时，叶片的P net 随着温度的升高而增加，在约30摄氏度，18和16 micro mol CO 2 m -2 <时最高。 / sup> s -1 分别位于“ Marmolda”和“ Darselect”的收获中期。随着温度的进一步升高，P net 下降。但是，在40摄氏度时，P net 仍然很可观，大约有10 micro mol CO 2 m -2 s -1 < / sup>表示草莓叶片的光合作用似乎适合高温条件。叶龄对P net 有很大影响。在不同收获期，将植物最年轻的完全发育的叶片与10、20和30天的叶片进行比较。对于'Marmolada'和'Darselect'，较老的叶片的P net 分别比最年轻的完全发育的叶片高24％或12％。但是，P net 对温度和光强度的响应不受叶龄的影响。

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