Strong Acidic Conditions Impaired Photosynthesis, Root System and Seedling Growth of Flue-Cured Tobacco
Year: 2019
Type: article
Abstract: Soil pH is closely related to soil microbial activity, conversion and release of crop nutrient elements, and crop growth.In this study, tobacco was grown in solution culture at varying solution pH levels (solution pHs 4, 5, 6, 7 and 8).Data regarding tobacco growth, dry matter accumulation, activities of membrane-lipid peroxidation and protective enzymes, chlorophyll contents and photosynthetic rate were recorded at 10, 17, 24, 31, 38 and 45 days after transplanting tobacco seedlings.Results showed that growth and physicochemical characteristics of tobacco seedlings were different under varying solutions pH.With increasing solution pH, tobacco root length, volume, surface area, tip number and vitality, the ratio of root dry weight, and malondialdehyde contents increased, whereas the ratio of stem dry weight and superoxide dismutase activity was decreased.Tobacco seedling growth was strongly impaired at pH 4 while solution pH 6-7 seemed superior with respect to tobacco growth.At pH 6, the chlorophyll and photosynthesis rate of tobacco leaves reached at the highest values while pH 8 was beneficial for roots growth.In crux, tobacco growth was inhibited under strong acid and alkaline conditions due to over generation of reactive oxygen species, decreased activity of protective enzymes along with cell membrane damage leading to substantial decline in photosynthesis.Therefore, soils having pH in the range of 6-7 seemed more productive for flue-cured tobacco growth.
Authors: Jin Chen, Hanhui Deng, Yuanhuan Li, Lili Yang, Yongsheng Deng, Xiaohua Deng, Zhicheng Zhou, Shuguang Peng, Yongjun Liu, Minghui Tian, Zhifeng Chen
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: bronze
Funder: Hunan Agricultural University
OpenAlex ID: W4417522818