盐胁迫对西南卫矛生长及光合特性的影响

doi:10.6040/j.issn.1671-9352.0.2018.730

Abstract

Abstract:

A potted experiment was conducted to explore the effects of salt stress on seedling growth and photosynthetic characteristics of Euonymus hamiltonianus. The biennial seedlings were exposed to different contents of NaCl solutions (0, 2.0, 4.0, 6.0 g·L^-1) for 30 days. The photosynthetic gas exchange parameters [i.e. net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and intercellular CO₂ concentration (Ci)], biomass properties, relative electrical conductivity, pigment contents and kinetic characteristics of chlorophyll fluorescence were measured, aiming to investigate the adaptation mechanism to salt stress of E. hamiltonianus. The results showed that: Compared with CK, salt stress induced a significant decrease of Pn, Tr, Gs, limiting value of stomata(Ls) and water use efficiency (WUE), whereas it caused by a marked increase of Ci under different NaCl solutions in E. seedlings. The maximum photochemical efficiency (F_v/F_m) and the number of active reaction centers per unit area (RC/CS_m) in the blade were reduced under saline treatments compared to that of in the controls, and both of the F_v/F_m and RC/CS_m got significant differences. The points of K to J in the OJIL curve were increased and reached markedly differences, while the pigments contents were significantly decreased, induced by the salt conditions. Besides, compared with CK, the root-shoot ratio (R/S) and Ec had no obvious difference in the treatment of 2.0 g·L^-1, while they were significantly higher in treatments of 4.0, 6.0 g·L^-1. In conclusions, from the above results we could conclude that E. hamiltonianus had cer-tain tolerance to low concentration of salt stress, but higher NaCl concentration could suppressed seedling growth for it inhibited the activity of PSⅡ, reduced photosynthetic performance and use efficiency of mineral nutrients, resulting in a poor growth and even death of the plants.

Key words: Euonymus hamiltonianus, salt stress, photosynthetic performance, JIP-test, biological properties

CLC Number:

Q945

Shi-yuan MENG,Qian WANG,Ye WEI,Chun-hui LING,Ying ZHANG,Hua-tian WANG,Xiu-mei LIU. Effects of salt stress on the growth and photosynthetic production of Euonymus hamiltonianus[J].JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE), 2019, 54(7): 26-34.

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References 32

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质量浓度/(g·L^-1)	叶绿素a/(mg·g^-1)	叶绿素b/(mg·g^-1)	总叶绿素/(mg·g^-1)	类胡萝卜素/(mg·g^-1)
CK	1.39±0.11a	0.49±0.05a	1.88±0.16a	0.30±0.07a
2.0	1.01±0.05b	0.40±0.04b	1.40±0.09b	0.23±0.01b
4.0	0.75±0.06c	0.34±0.05b	1.09±0.09c	0.18±0.02bc
6.0	0.58±0.02d	0.25±0.01c	0.83±0.02d	0.16±0.02c

处理	根干重/g	茎干重/g	叶干重/g	总生物量/g	根冠比	相对电导率
CK	34.43±1.34a	65.28±5.15a	32.03±4.61a	131.74±3.65a	0.35±0.03c	0.40±0.01c
2.0 g·L^-1	29.44±2.31b	58.85±5.00b	21.72±1.65b	110.01±6.77b	0.36±0.03c	0.42±0.01c
4.0 g·L^-1	26.79±1.49c	47.84±2.47c	10.44±1.76c	83.21±8.94c	0.48±0.07b	0.50±0.02b
6.0 g·L^-1	24.29±2.07d	36.86±4.09d	3.52±0.92d	64.66±5.52d	0.60±0.06a	0.62±0.02a

Effects of salt stress on the growth and photosynthetic production of Euonymus hamiltonianus

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