Beneficial effects of red and blue light on potato leaf antioxidant capacity and tuber bulking

Wei He; Qiang Chai; Dan Zhang; Wenli Li; Cai Zhao; Wen Yin; Hong Fan; Aizhong Yu; Falong Hu; Zhilong Fan

doi:10.1007/s12298-023-01309-5

Beneficial effects of red and blue light on potato leaf antioxidant capacity and tuber bulking

Physiol Mol Biol Plants. 2023 Apr;29(4):513-523. doi: 10.1007/s12298-023-01309-5. Epub 2023 May 1.

Authors

Wei He¹, Qiang Chai^{1

2}, Dan Zhang¹, Wenli Li¹, Cai Zhao¹, Wen Yin^{1

2}, Hong Fan¹, Aizhong Yu^{1

2}, Falong Hu^{1

2}, Zhilong Fan^{1

2}

Affiliations

¹ State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou, 730070 People's Republic of China.
² College of Agronomy, Gansu Agricultural University, Lanzhou, 730070 People's Republic of China.

Abstract

Artificial light application is an effective method for promoting potato production in indoor facilities. In this study, we assessed the effects of different combinations of red (R) and blue (B) light application on potato leaf and tuber growth. Potato plantlets were transplanted under W (white light, control), RB_5-5 (50% R + 50% B), RB_3-7 (30% R + 70% B to 70% R + 30% B) and RB_1-9 (10% R + 90% B to 90% R + 10% B), and ascorbic acid (AsA) metabolism in leaves and cytokinin (CTK), auxin (indole-3-acetic acid, IAA), abscisic acid (ABA), and gibberellin (GA) levels in tubers were measured. At 50 days of treatment, potato leaves had significantly higher L-galactono-1,4-lactone dehydrogenase (GalLDH) activity and utilized AsA faster under RB_1-9 treatment than under RB_3-7 treatment. CTK/IAA and ABA/GA ratios in large tubers under W treatment did not differ significantly from those under RB_1-9 treatment, which had higher levels than those under RB_5-5 and RB_3-7 treatment at 50 days. However, under RB_1-9 treatment, total leaf area decreased rapidly from 60 to 75 days compared with plants under RB_3-7 treatment. Tuber dry weight per plant under W and RB_5-5 treatment approached a plateau at 75 days. At 80 days, RB_3-7 treatment significantly improved ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase, and glutathione reductase activity compared with RB_1-9 treatment. RB_1-9 treatment with a high ratio of blue light increased CTK/IAA and ABA/GA to improve tuber bulking at 50 days, while RB_3-7 treatment with a high ratio of red light stimulated AsA metabolic pathway to delay leaf oxidation and maintain tuber biomass accumulation at 80 days. For the indoor potato cultivation, RB_3-7 treatment had a higher proportion of medium-sized tubers, thus being a suitable light treatment.

Keywords: Ascorbic acid metabolic pathway; Hormone; Potato; Red and blue light.

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