1. 深色有隔内生真菌对 NaCl 胁迫下白皮松幼苗生长、光合荧光及离子吸收的影响.
- Author
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徐 朗, 赵梓彭, 谢 冰, 郭 畅, 张睿捷, and 王晓娜
- Subjects
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ALTERNARIA , *SALT - Abstract
[Objective] The study aimed to investigate the effects of inoculating dark septal endophytes (DSE) on the growth, photosynthetic capacity, chlorophyll fluorescence and ion absorption of Pinus bungeana subjected salt stress. [Method] The trial included NaCl stress (0%, 0.1%,0.2%,0.3%) and inoculation treatment: Paraphoma radicina (Pr), Phialophora mustea (Pm), Alternaria tenuissima (At), Acrocalymma vagum (Av) and unvaccinated control (CK). The infection rate, plant biomass, photosynthetic capacity, chlorophyll fluorescence, K+ and Na+ content were measured after 30 days of NaCl treatment. [Result] The infection rate of Pr, Pm, At, and Av was highest at NaCl stress level of 0.3%,0.2%,0.1%,0.2%, respectively. Compared to seedlings subjected to 0% NaCl stress, those exposed to 0.3% NaCl stress exhibited significant increases in shoot, root and total biomass. Inoculation treatments led to elevated total chlorophyll content, enhanced photosynthetic parameters, increased TRo/RC, ETo/RC ratios, as well as decreased ABS/RC, DIo/RC in chlorophyll fluorescence. Notably, under 0.3% NaCl stress, Pm, At and Av treatments significantly reduced shoot Na content in P. bungeana, by 34.0%,26.6% and 26.3%, respectively. Furthermore, Pm and Av treatments considerably decreased root Na content, by 24.4% and 26.6% respectively. At 0.2% NaCl stress, Pr, Pm, At, Av significantly increased K+ content by 42.9%, 58.99%, 56.96% and 55.92% respectively, consequently elevating the K+/Na ratio. [Conclusion] Moderate NaCl stress was found to enhance the infection rate of DSE. The DSE inoculation was observed to mitigate the impact of NaCl stress on the photosynthesis, regulate K and Na ion content, and thereby alleviate NaCl-induced damage while sustaining growth. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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