Effects of Exogenous Ethylene and Cobalt Chloride on Root Growth of Chinese Fir Seedlings under Phosphorus-Deficient Conditions
Studying the effects of different concentrations of ethephon on morphological and physiological changes in the roots of Chinese fir (<i>Cunninghamia lanceolata</i> Lamb. Hook.) seedlings under P deficiency can reveal the internal adaptive mechanisms of these plants under nutrient stress....
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/e1aa7675a2b74f42acd187bfecb139fb |
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| Sumario: | Studying the effects of different concentrations of ethephon on morphological and physiological changes in the roots of Chinese fir (<i>Cunninghamia lanceolata</i> Lamb. Hook.) seedlings under P deficiency can reveal the internal adaptive mechanisms of these plants under nutrient stress. Herein, we investigated the effects of different ethephon and cobalt chloride concentrations under normal P supply and P deficiency. A significant effect (<i>p</i> < 0.05) of exogenous additive application was observed on the development of Chinese fir root length, surface area, and volume. These root development indices showed maximum values when the ethephon concentration was 0.01 g kg<sup>−1</sup> under normal P supply and P deficiency, and they were significantly different from those under 0.04 g kg<sup>−1</sup> ethephon treatment. Similarly, the indices showed maximum values when CoCl<sub>2</sub> concentration was 0.01 g kg<sup>−1</sup> under P deficiency and was significantly different (<i>p</i> < 0.01) from those under 0.2 g kg<sup>−1</sup> CoCl<sub>2</sub> treatment. Under normal P supply, an increase in ethephon concentration caused superoxide dismutase (SOD; E.C. 1.15.1.1) activity to decrease and peroxidase (POD; E.C. 1.11.1.X) activity to increase gradually. Conversely, CoCl<sub>2</sub> addition (0.01 g kg<sup>−1</sup>) promoted SOD and POD activities under P deficiency. There were no significant differences (<i>p</i> > 0.05) in malondialdehyde content of seedlings among ethephon or CoCl<sub>2</sub> treatments. In conclusion, ethylene plays a significant role in adaptative mechanisms underlying stress resistance in plants, prompting them to respond to P starvation and improving seedlings’ tolerance to P-deficient conditions. |
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