Speed Breeding Scheme of Hot Pepper through Light Environment Modification

Kaizhe Liu, Rui He, Xinyang He, Jiehui Tan, Yongkang Chen, Yamin Li, Rongyun Liu, Yanwu Huang () and Houcheng Liu ()
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Kaizhe Liu: College of Horticulture, South China Agricultural University, Guangzhou 510642, China
Rui He: College of Horticulture, South China Agricultural University, Guangzhou 510642, China
Xinyang He: College of Horticulture, South China Agricultural University, Guangzhou 510642, China
Jiehui Tan: College of Horticulture, South China Agricultural University, Guangzhou 510642, China
Yongkang Chen: College of Horticulture, South China Agricultural University, Guangzhou 510642, China
Yamin Li: College of Horticulture, South China Agricultural University, Guangzhou 510642, China
Rongyun Liu: Hunan Xiangyan Seed Industry Co., Ltd., Changsha 410139, China
Yanwu Huang: Hunan Xiangyan Seed Industry Co., Ltd., Changsha 410139, China
Houcheng Liu: College of Horticulture, South China Agricultural University, Guangzhou 510642, China

Sustainability, 2022, vol. 14, issue 19, 1-9

Abstract: Crop breeding for high yields and quality is an important measure to ensure food security. In conventional breeding, a long generation time is required. Speed breeding could accelerate the flowering and fruiting of crops by providing suitable environmental conditions in order to reduce the generation times. This study aimed to determine a speed breeding scheme for hot peppers. Two hot pepper varieties, ‘Xiangyan 55’ and ‘Xiangla 712’, were investigated for their growth and development under different light intensities, photoperiods, and red-to-far-red ratios. Hot pepper plants bloomed at 39.88 ± 0.74 days after sowing under photosynthetic photon flux density (PPFD) 420 µmol·m −2 ·s −1 and a 12-h photoperiod and had seed with acceptable germination rates at 82 days after sowing. Blooming was 2–3 days earlier when the photoperiod was extended to 20 h, but the fruit and seed development were not significantly improved. Supplementation of far-red light (R:FR = 2.1) significantly accelerated the red ripening of pepper fruit and improved seed germination rates. The modification of the light environment accelerated hot pepper growth and development, reduced breeding cycles, and could produce up to four generations per year.

Keywords: light intensity; photoperiod; red to far-red ratio; speed breeding; Capsicum (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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