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- Title
Physiological responses of Phoebe bournei seedlings to different light intensities and silicon fertilizer applications.
- Authors
LIAO Xiaoli; CAI Siying; LI Peiyao; XUE Kexin; LIN Junyi; XIONG Houshui; HUANG Wei; JIN Shaofei; ZHENG Dexiang
- Abstract
[Objective] To provide a theoretical basis for regenerating Phoebe bournei understory and mixed forestation,the physiological response characteristics of P. bournei seedlings to different light intensities and silicon fertilization were investigated. [Methodl As the study subjects,one-year-old P. bournei seedlings were transplanted into pots and placed in shade net chambers with different relative light intensity levels of 100% (full light, CK), 60%, 40%, 1 5 % and 5% simulated by covering with black nylon nettings. Water-soluble silicon fertilizer (SiO2 content >50%) was added at 0,1 000,2 000 and 4 000 mg/kg levels, respectively. Height and diameter growths of P. bournei seedlings under different treatments were measured and physiological and biochemical indices including superoxide dismutase (SOD), peroxidase (POD), catalase (CAT),soluble sugars,soluble proteins and malondialdehyde (MDA) were determined. Changes in leaf physiological indexes under different treatments were analyzed across three periods of early stage (August 2021,the 4th month),middle stage (December 2021,the 8th month) and late stage (April 2022, the 12th month). [Result] Under same light intensities, height and diameter growths of P. bournei seedlings increased initially and then decreased with the increase of silicon addition. The addition of 1 000 - 2 000 mg/kg silicon significantly increased height and diameter growth of seedlings under relative light intensity of 15%-40%. At the early stage with same silicon additions, activity levels of SOD,POD and CAT enzymes in P. bournei seedling leaves generally decreased first and then increased with the decrease of light intensity. In contrast, contents of soluble sugar, soluble protein and MDA ge-nerally increased first and then decreased. In the middle stage with same silicon amounts, SOD and POD activities as well as soluble sugar content in leaves of P. bournei seedlings generally increased initially and then decreased with the decrease of light intensity. Instead, CAT activity and MDA content generally decreased initially and then increased,while there was no clear pattern in soluble protein content. At the late stage with same silicon amounts,activities of SOD,POD and CAT and contents of soluble sugar and soluble protein in leaves generally increased first and then decreased, while MDA content showed opposite trend with the decrease of light intensity. Effects of silicon addition on physiological indexes of P. bournei seedling leaves were significant under same light intensities among three periods. When 1 000 - 2 000 mg/kg of silicon was added at 5% - 40% light intensity,there were significant increases in SOD and CAT activities. Adding 1 000 - 2 000 mg/kg silicon overall significantly increased soluble sugar content. Soluble protein content was significantly increased by 2 000 mg/kg silicon at 5% - 15% light intensities, while MDA content was significantly decreased by 1 000 - 4 000 mg/kg silicon addition at 15%-40% light intensities. [Conclusion] Silicon addition had significant impacts on growth and leaf physiological indicators of P. bournei seedlings under different relative light intensities. Proper shading was beneficial for the growth of P. bournei seedlings and adding silicon fertilizer further enhanced the adaptability of P. bournei seedlings to light stress,which ultimately improved the regeneration of P. bournei forests.
- Subjects
LIGHT intensity; FERTILIZER application; SUPEROXIDE dismutase; LEAF growth; PEROXIDASE
- Publication
Journal of Northwest A & F University - Natural Science Edition, 2024, Vol 52, Issue 12, p28
- ISSN
1671-9387
- Publication type
Academic Journal
- DOI
10.13207/j.cnki.jnwafu.2024.12.004