Effects of supplemental lighting during the period of rapid fruit development on the growth, yield, and energy use efficiency in strawberry plant production

Abstract

Supplemental lighting techniques in greenhouses can increase plant growth and yield but require substantial amounts of energy. We proposed the use of energy-saving supplemental lighting, which was applied during rapid fruit development when the transport of photosynthetic products into the fruit was active. We measured the physiological responses (photosynthesis, growth, yield) of the strawberry plants with single fruit truss, wherein the following 3 treatments were made: plants were cultivated with no supplemental lighting (control), supplemental lighting throughout the experimental period (normal-light), and supplemental lighting during rapid fruit development (short-light). The period of rapid fruit development corresponded to 33% of the experimental period, and the cumulative light intensity for the short-light treatment was half of that for the normal-light treatment, and twice that of the control treatment. Consequently, the leaf area and dry weight of the plant body were significantly increased following normal-light and short-light treatments compared with the control treatment. The yield for the short-light treatment was also increased and nearly equal to that of the normal-light treatment but no significance to the control treatment. However, the energy use efficiency of the short-light was improved 1.5-fold compared to the normal-light treatment. Thus, shortening the period of supplemental lighting in accordance with the characteristics of fruit development is potentially effective.

Non-invasive 11C-Imaging Revealed the Spatiotemporal Variability in the Translocation of Photosynthates Into Strawberry Fruits in Response to Increasing Daylight Integrals at Leaf Surface

“…More specifically, sucrose, glucose, and fructose, which are the most abundant soluble solids in strawberry fruits, determine fruit sweetness (Perez et al, 1997;Todeschini et al, 2018). Because the fruit sugar content is greatly affected by the ambient environment, strawberry plants are increasingly being cultivated under controlled environmental conditions (e.g., light intensity, air temperature, and CO 2 concentration) (Neri et al, 2012;Hidaka et al, 2013Hidaka et al, , 2016Miyoshi et al, 2017;Samtani et al, 2019;Yoneda et al, 2020). During this protected cultivation, environmental conditions are modulated to promote leaf photosynthesis, which positively affects strawberry fruit yield and quality.…”

Yield and Photosynthesis Related to Growth Forms of Two Strawberry Cultivars in a Plant Factory with Artificial Lighting

“…Factors affecting the yield of PFAL. The yield and DW of plant organs are often correlated with the total photosynthetic content during the cultivation period (Heuvelink 2005;Yoneda et al 2020). During this study, the yield of Koiminori was 1.9-times higher than that of Tochiotome at the end of cultivation (Fig.…”

Contribution of diffusional and non-diffusional limitations to the midday depression of photosynthesis which varies dynamically even under constant environmental conditions

“…Lighting was provided by 10 LEDs (LLM031, Stanley, Japan) with a photosynthetic photon flux density (PPFD) of 1806 ± 133.2 μmol m -2 s -1 at the leaf surfaces. The LED light was white, and the peaks of the spectral distributions appeared at wavelengths of 450 and 550 nm (Yoneda et al, 2020). The air temperature and vapour pressure deficit were maintained at 25°C and 2.5 kPa, respectively, which was identical to the ambient conditions in the laboratory.…”