Photosynthetic Characteristics of Individual Strawberry (Fragaria ×ananassa Duch.) Leaves under Short-distance Lightning with Blue, Green, and Red LED Lights

in HortScience

To clarify the response of net photosynthetic rate (Pn), stomatal conductance (gS), transpiration rate (Tr), and leaf intercellular CO2 concentration (Ci) to irradiance on the adaxial and abaxial sides of mature and young strawberry leaves using blue, green, and red light-emitting diodes (LEDs), irradiation from a short distance was investigated using ‘Tochiotome’. Light–photosynthetic response curves of the adaxial side of mature leaves were not different among LED treatments. However, those of the adaxial side of young leaves irradiated with red LEDs were less than those of other LED treatments. Pn of the abaxial side of mature leaves was 42% to 71% of the abaxial side. In young leaves, Pn of the abaxial side was 17% to 68% of the adaxial side. Moreover, light–transpiration response curves were different with LED treatments. Ci and Tr under blue and green LEDs were greater than those under red LEDs. This indicates that blue and green lights affected the stomatal opening. In contrast, red LEDs decreased Ci more than other LED treatments. In addition, reactions of the adaxial side of young leaves under blue and red LEDs were seen not only in ‘Tochiotome’, but also in ‘Sachinoka’ and ‘Eran’, which indicates that the photosynthetic reactions of blue light and red light are common characteristics of the strawberry. Therefore, red LEDs promoted the photochemical reaction and activated the CO2 fixation system. Based on the results of this study of short-distance lighting with LEDs in strawberry production, irradiance of the abaxial side of leaves by blue or green LEDs might improve more assimilates in young leaves compared with red LEDs to increase strawberry yield.

Contributor Notes

Current address: College of Agriculture, Ibaraki University, Ami, Inashiki, Ibaraki 300-0393, Japan.

Contributed equally.

Corresponding author. E-mail: ogiwara@cc.tuat.ac.jp.

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Article Figures

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    Spectrum distribution of blue, green, and red light-emitting diodes (LEDs). Relative values are shown for each peak wavelength.

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    Responses of net photosynthetic rates to irradiance for strawberry leaves—adaxial side of (A) mature leaves and (B) young leaves, abaxial side of (C) mature leaves and (D) young leaves—by blue, green, and red light-emitting diodes (LEDs). The mature leaves are the fifth or sixth leaf count from an expanding leaf and the young leaves are the second leaf. Error bars indicate sd (n = 3). Different letters indicate significant differences and ns means nonsignificance among the light qualities at each photosynthetic photon flux density (PPFD) by Fisher’s protected least significant difference test (P = 0.05).

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    Responses of stomatal conductance, leaf intercellular CO2 concentrations, and transpiration rates to irradiance for the adaxial side of (A, C, E) mature strawberry leaves and (B, D, F) young strawberry leaves by blue, green, and red light-emitting diodes (LEDs). The mature leaves are the fifth or sixth leaf count from an expanding leaf and the young leaves are the second leaf. Error bars indicate sd (n = 3). Different letters indicate significant differences and ns means nonsignificance among the light qualities at each photosynthetic photon flux density (PPFD) by Fisher’s protected least significant difference test (P = 0.05).

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    Responses of stomatal conductance, leaf intercellular CO2 concentrations and transpiration rates to irradiance for abaxial side of (A, C, E) mature strawberry leaves and (B, D, F) younger strawberry leaves by blue, green, and red light-emitting diodes (LEDs). The mature leaves are the fifth or sixth leaf count from an expanding leaf and the young leaves are the second leaf. Error bars indicate sd (n = 3). Different letters indicate significant differences and ns means nonsignificance among the light qualities at each photosynthetic photon flux density (PPFD) by Fisher’s protected least significant difference test (P = 0.05).

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    Comparison of net photosynthetic rates to be irradiated on the adaxial side of young strawberry leaves by blue and red light-emitting diodes (LEDs) on (A) ‘Tochiotome’, (B) ‘Sachinoka’, and (C) and ‘Eran’. The young leaves are the second leaf count from an expanding leaf. Error bars indicate sd (n = 3). ns and * mean nonsignificance and significance (P = 0.05), respectively, between the light qualities at each photosynthetic photon flux density (PPFD) by t test.

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    Comparisons of stomatal conductance, leaf intercellular CO2 concentrations and transpiration rates to be irradiated on the adaxial side of young strawberry leaves by blue and red light-emitting diodes (LEDs) on (A, D, G) ‘Tochiotome’, (B, E, H) ‘Sachinoka’, and (C, F, I) ‘Eran’. The young leaves are the second leaf count from an expanding leaf. Error bars indicate sd (n = 3). ns and * mean nonsignificance and significance (P = 0.05), respectively, between the light qualities at each photosynthetic photon flux density (PPFD) by t test.

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