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Ding X, Zhang H, Qian T, He L, Jin H, Zhou Q, Yu J. Nutrient Concentrations Induced Abiotic Stresses to Sweet Pepper Seedlings in Hydroponic Culture. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11081098. [PMID: 35448826 PMCID: PMC9027179 DOI: 10.3390/plants11081098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/31/2022] [Accepted: 04/14/2022] [Indexed: 05/16/2023]
Abstract
The primary goal of this experiment was to investigate the effects of nutrient electrical conductivity (EC) on the growth and physiological responses of sweet pepper (Capsicum annuum L.) in hydroponic culture in a greenhouse. The plant growth parameters, leaf photosynthesis, root activity, soluble protein, malondialdehyde (MDA), proline, activities of antioxidant enzymes (AE), and the contents of plant mineral elements (PME) were measured in six different EC treatments. The results showed that very high or low EC treatments clearly decreased the plant height, stem diameter, shoot dry weight, and leaf net photosynthetic rate, while increasing the content of MDA and the activities of ascorbate peroxidase and guaiacol peroxidase. The contents of proline and soluble protein increased gradually from the low to high EC treatments. The root activities decreased significantly, and the main PME clearly did not increase or even decreased at high EC levels. Very high EC treatments suppressed growth even more than those of very low EC. Treatments that were too low or high EC suppressed plant growth, owing to abiotic stress (either nutrient deficiency or salinity), since the plants had to regulate the activities of AE and increase the accumulation of osmolytes to adjust to the abiotic stresses.
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Affiliation(s)
- Xiaotao Ding
- Shanghai Key Lab of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; (X.D.); (H.Z.); (T.Q.); (L.H.); (H.J.)
- Shanghai Dushi Green Engineering Co., Ltd., Shanghai 201106, China
| | - Hongmei Zhang
- Shanghai Key Lab of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; (X.D.); (H.Z.); (T.Q.); (L.H.); (H.J.)
| | - Tingting Qian
- Shanghai Key Lab of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; (X.D.); (H.Z.); (T.Q.); (L.H.); (H.J.)
| | - Lizhong He
- Shanghai Key Lab of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; (X.D.); (H.Z.); (T.Q.); (L.H.); (H.J.)
| | - Haijun Jin
- Shanghai Key Lab of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; (X.D.); (H.Z.); (T.Q.); (L.H.); (H.J.)
| | - Qiang Zhou
- Shanghai Key Lab of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; (X.D.); (H.Z.); (T.Q.); (L.H.); (H.J.)
- Shanghai Dushi Green Engineering Co., Ltd., Shanghai 201106, China
- Correspondence: (Q.Z.); (J.Y.)
| | - Jizhu Yu
- Shanghai Key Lab of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; (X.D.); (H.Z.); (T.Q.); (L.H.); (H.J.)
- Correspondence: (Q.Z.); (J.Y.)
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