盐胁迫对黑果枸杞光合生理指标的影响

doi:10.16843/j.sswc.2019.01.011

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Abstract [Background] The Qaidam Basin is one of the most serious land salinization areas in China, especially secondary salinization, which not only has serious impacts on the survival of local residents and agricultural development, but also hinders the construction of ecological environment. Recently, the nutrients, trace elements, polysaccharides and pigments of Lycium ruthenicum have mainly been analyzed by scholars, but the ecological benefits have been less investigated, especially stress resistance. At present, the research area is mainly concentrated in Ningxia,there is very little research on the Qaidam area,especially secondary saline land.Therefore, it is importment to determine the resistance of L. ruthenicum and to explore its salt tolerance mechanism, which is essential to improve the ecological security and economic benefits of the Qaidam Basin.[Methods] 1-year-old L. ruthenicum seedlings were used for pot comparison test in Nuomuhong Farm on the southeastern edge of the Qaidam Basin. Salt stress environment was simulated using salt solution concentration gradients of 0,50,100,200 and 400 mmol/L, there were 3 repeats in each gradient, thus totally 15 pots. Through the weighing method, soil was controlled in the amount of water as 75%±0.3% of the field water capacity. The growth trend, photosynthetic characteristics, and chlorophyll fluorescence characteristics of the L. ruthenicum were measured by Meter ruler,Licor-6400,handy PEA chlorophyll fluorescence instrument, and spectrophotometer respectively under salt stress. Data were analyzed according to ANOVA by SPSS statistical software and the significant differences among means were identified by Duncan's multiple range tests at a significance level of P<0.05, and all data were presented as mean ±SE.[Results] 1) High concentrations (100-400 mmol/L) of salt stress significantly decreased plant height increment, chlorophyll content, and maximum fluorescence yield (F_m). 2) The net photosynthetic rate (P_n), stomatal conductance (G_s), transpiration rate (T_r) and maximum photochemical efficiency (F_v/F_m) of the plants significantly reduced when the salt concentration was >100 mmol/L. These indicators were elevated but not so significant when the salt concentration was 50 mmol/L. 3) When the salt concentration was 400 mmol/L, the F_o decreased significantly. 4) Low concentration of salt stress (50-100 mmol/L) decreased the C_i. When the salt concentration exceeded 200 mmol/L, C_i increased significantly.[Conclusions] In a summary, the chlorophyll content and photosynthetic physiological indicators of L. ruthenicum seedlings significantly reduced under high salt stress, which ultimately led to the inhibition of plant growth. At this time,non-stomatal limitation and inactivation of photochemical activity were the main factors affecting photosynthesis. Under low concentration of salt stress,the physiological growth indicators of L. ruthenicum did not change significantly, exhibiting a certain degree of salt tolerance.

Key words： Lycium ruthenicum salt stress chlorophyll content maximum photochemical efficiency photosynthesis

Received: 26 September 2018

PACS:

Q945.78

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	Articles by authors
	LI Yuanhang
	HE Kangning
	ZHANG Tan
	ZHANG Zhenzhong
	YIN Baosi
	LIN Sha
	WANG Li

Cite this article:

LI Yuanhang,HE Kangning,ZHANG Tan, et al. Effects of salt stress on the photosynthetic and physiological indexes of Lycium ruthenicum[J]. SSWC, 2019, 17(1): 82-88.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.01.011 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I1/82

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