Moderate Boron Concentration Beneficial for Flue-Cured Tobacco ( Nicotiana tabacum L.) Seedlings Growth and Development

Mengxia Li, Haowei Sun, Jianfeng Sun, Jialiang Li, Xiaowei Zhang, Ke Zhang, Tao Wang, Xinwei Ji, Xiaopeng Deng, Chenggang He, Yongzhong Li () and Congming Zou ()
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Mengxia Li: College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China
Haowei Sun: Agronomic Research Center, Yunnan Academy of Tobacco Agricultural Sciences, 33 Yuantong Street, Kunming 650021, China
Jianfeng Sun: Agronomic Research Center, Yunnan Academy of Tobacco Agricultural Sciences, 33 Yuantong Street, Kunming 650021, China
Jialiang Li: College of Tobacco Science, Yunnan Agricultural University, Kunming 650201, China
Xiaowei Zhang: Agronomic Research Center, Yunnan Academy of Tobacco Agricultural Sciences, 33 Yuantong Street, Kunming 650021, China
Ke Zhang: Agronomic Research Center, Yunnan Academy of Tobacco Agricultural Sciences, 33 Yuantong Street, Kunming 650021, China
Tao Wang: Agronomic Research Center, Yunnan Academy of Tobacco Agricultural Sciences, 33 Yuantong Street, Kunming 650021, China
Xinwei Ji: Agronomic Research Center, Yunnan Academy of Tobacco Agricultural Sciences, 33 Yuantong Street, Kunming 650021, China
Xiaopeng Deng: Agronomic Research Center, Yunnan Academy of Tobacco Agricultural Sciences, 33 Yuantong Street, Kunming 650021, China
Chenggang He: College of Tobacco Science, Yunnan Agricultural University, Kunming 650201, China
Yongzhong Li: College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China
Congming Zou: Agronomic Research Center, Yunnan Academy of Tobacco Agricultural Sciences, 33 Yuantong Street, Kunming 650021, China

Agriculture, 2022, vol. 12, issue 10, 1-15

Abstract: Boron (B) deficiency is a common phenomenon in most tobacco-planting areas in Yunnan, China. In 2020 and 2022, hydroponic experiments that contained B in a concentration gradient of 0.000, 0.125, 0.250, 0.750, 5.000, 10.000, 20.000, and 40.000 mmol L −1 were conducted to investigate tobacco cultivar K326′s agronomic traits, photosynthetic performance, antioxidant enzymes, and boron and nicotine concentration. As B concentration increased, indices including leaves biomass and net photosynthetic rate (Pn) generally increased first and then decreased, which was in contrast to antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT). With increasing B concentration, boron content in tobacco seedlings increased significantly by 24.00~96.44%, while decreased nicotine content by 21.60~82.03%. The highest biomass and photosynthetic performance were obtained within 0.75 and 5.00 mmol L −1 treatments. The results of the sandy soil pot verification experiment were similar to the hydroponic experiment obtained. The beneficial mechanism of moderate B on tobacco seedlings is to maintain cell structure integrity, enhance photosynthetic capability, and promote root growth. Consequently, the optimum B concentration for tobacco seedlings is 0.75~5.00 mmol L −1 , and applying 0.25~0.50 B kg hm −1 in soil under available B insufficiency could meet the needs of the growth of flue-cured tobacco.

Keywords: micronutrient; photosynthesis; physiology and biochemistry; enzyme activity; nicotine (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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