Effects of Red and Blue Light with Supplemental White Light on Growth, Carbohydrate Metabolism, and Yield of Virus-Free
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Effects of Red and Blue Light with Supplemental White Light on Growth, Carbohydrate Metabolism, and Yield of Virus-Free Potato in Plant Factories Wei He 1 & Chen Miao 1 & Jie You 1 & Lijun Gan 2 & Zhi-Gang Xu 1 Accepted: 5 October 2020 # The Potato Association of America 2020
Abstract The light spectrum has a strong effect on potato tuber development. To investigate the effect of varying the spectrum on potato tuber growth and yield, potato plantlets were transplanted under red/white light (RW; red light: 200 μmol m−2 s−1; white light: 100 μmol m−2 s−1), blue/white light (BW; blue light: 200 μmol m−2 s−1; white light: 100 μmol m−2 s−1), and white/red/blue light (WRB; white light: 100 μmol m−2 s−1; red light: 100 μmol m−2 s−1; blue light: 100 μmol m−2 s−1) with a 11/13-h (light/dark) photoperiod. Potato plants grown under RW had the highest mean fresh tuber weight and total yield among all treatments. Plants under RW resulted in the highest shoot dry weight at 30 d and 45 d among all treatments, providing a photosynthetic source for the tubers. Furthermore, the photosynthetic leaves under RW had a significantly higher total chlorophyll content than other treatments at 90 d. Plants under RW significantly increased tuber fresh weight per plant by 57.7% from 60 to 90 d. The spectrum of BW benefited potato bulking. Plants under BW at 40 d resulted in significant sucrose and starch changes between day and night compared with those at 20 d. BW had a positive effect on the activities of ADP-glucose pyrophosphorylase at 40 d and sucrose synthase at 60 d compared with RW and WRB during the day. Thus, the ratio of tuber (fresh weight of tuber ≥2.0 g) under BW was significantly higher than that under RW and WRB. The total yield of tubers under WRB was the lowest among all treatments. Resumen El espectro de luz tiene un fuerte efecto en el desarrollo del tubérculo de papa. Para investigar el efecto de variación del espectro en el crecimiento y rendimiento del tubérculo en papa, se trasplantaron plántulas de papa bajo luz roja/ blanca (RW; luz roja: 200 μmol m-2 s-1; luz blanca: 100 μmol m-2 s-1), luz azul/blanca (BW; luz azul: 200 μmol m-2 s-1; luz blanca: 100 μmol m-2 s-1), y luz blanca/roja/azul (WRB; luz blanca: 100 μmol m-2 s-1; luz roja: 100 μmol m-2 s-1; luz azul: 100 μmol m-2 s-1) con un fotoperíodo de 11/13-h (luz/oscuridad). Las plantas de papa que crecieron bajo luz RW tuvieron la media mas alta de peso fresco de tubérculo y de rendimiento total entre todos los tratamientos. Las plantas bajo RW resultaron en el mayor peso seco de tallo a los 30 y 45 d entre todos los tratamientos, suministrando una fuente fotosintética para los tubérculos. Aun más, las hojas fotosintéticas bajo RW tuvieron significativamente mas alto contenido total de clorofila que los otros tratamientos a los 90 d. Las plantas bajo RW incrementaron significativamente el peso fresco de tubérculo por planta en 57.7% de 60 a 90 d. El espectro de BW benefició el llenado del tubérculo. Las plantas bajo BW a los 40 d resultaron en significativos cambios
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