Effects of NaCl Stress on Physiological and Chlorophyll Fluorescence Properties of Wild Soybean Seedlings

doi:10.11924/j.issn.1000-6850.casb2021-0670

Abstract

Abstract:

In order to study the effects of NaCl stress on photosynthesis chlorophyll fluorescence properties of wild soybean seedlings, wild soybean seedlings were treated with 0, 0.2%, 0.4%, 0.6%, and 0.8% NaCl solution. The change of the photosynthesis indexes and chlorophyll fluorescence parameters of wild soybean seedlings were analyzed under different stress conditions. The results showed that wild soybean seedlings maintained stable growth under 0.2% NaCl stress, and Fv/Fm increased. While under 0.4%-0.8% NaCl stress, the growth and photosynthesis of wild soybean seedlings were significantly inhibited. Along with the increase of NaCl concentration, the NPQ decreased first and then increased, and Fv/Fm increased first and then decreased. Along with the increase of light, Ф_PSⅡ and q_P of each group showed a downward trend, while ETR showed an upward trend. With the light intensity of 0-200 μmol/(m²·s), Ф_PSⅡof 0.2% NaCl stress treatment group was higher than that of the control. The results indicated that 0.4% NaCl might be the critical salt concentration for the growth, physiology and photosynthesis of wild soybean seedlings. Under low light condition, Ф_PSⅡ of plants was promoted by low salt stress (0.2% NaCl), however, under strong light condition, the damage of salt stress to wild soybean was enhanced.

Key words: wild soybean, NaCl stress, photosynthetic characteristics, physiological and ecological response, chlorophyll fluorescence parameter

CLC Number:

ZHAO Ruhao, DING Junnan, YU Shaopeng, WANG Hui, SHI Chuanqi, ZHANG Zhi, MENG Bo. Effects of NaCl Stress on Physiological and Chlorophyll Fluorescence Properties of Wild Soybean Seedlings[J]. Chinese Agricultural Science Bulletin, 2022, 38(14): 23-29.

Figures/Tables 5

References 33

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盐浓度/%	株高/cm	地上部生物量/(g/株FW)	地下部生物量/(g/株FW)	总生物量/(g/株FW)
0(CK)	41.63±1.26 a	0.21±0.01 a	0.09±0.01 a	0.30±0.01 a
0.2	40.51±1.19 a	0.19±0.02 a	0.08±0.01 a	0.27±0.02 a
0.4	33.54±1.89 b	0.16±0.02 b	0.06±0.01 b	0.22±0.03 b
0.6	32.14±2.62 bc	0.16±0.01 b	0.06±0.00 b	0.22±0.01 b
0.8	30.17±2.68 c	0.14±0.01 c	0.04±0.01 c	0.18±0.01 c

盐浓度/%	株高/cm	地上部生物量/(g/株FW)	地下部生物量/(g/株FW)	总生物量/(g/株FW)
0(CK)	41.63±1.26 a	0.21±0.01 a	0.09±0.01 a	0.30±0.01 a
0.2	40.51±1.19 a	0.19±0.02 a	0.08±0.01 a	0.27±0.02 a
0.4	33.54±1.89 b	0.16±0.02 b	0.06±0.01 b	0.22±0.03 b
0.6	32.14±2.62 bc	0.16±0.01 b	0.06±0.00 b	0.22±0.01 b
0.8	30.17±2.68 c	0.14±0.01 c	0.04±0.01 c	0.18±0.01 c

盐浓度/%	ETR	qP	Fv/Fm	NPQ
CK	174.53±10.27a	0.74±0.01a	0.80±0.02a	0.64±0.18b
0.2	170.57±10.03a	0.69±0.07a	0.81±0.01a	0.50±0.11b
0.4	127.50±7.50b	0.55±0.06b	0.80±0.03ab	0.76±0.17b
0.6	113.79±6.69b	0.52±0.09b	0.79±0.05b	1.04±0.15a
0.8	92.14±5.42c	0.47±0.02b	0.75±0.02b	1.11±0.12a

盐浓度/%	ETR	qP	Fv/Fm	NPQ
CK	174.53±10.27a	0.74±0.01a	0.80±0.02a	0.64±0.18b
0.2	170.57±10.03a	0.69±0.07a	0.81±0.01a	0.50±0.11b
0.4	127.50±7.50b	0.55±0.06b	0.80±0.03ab	0.76±0.17b
0.6	113.79±6.69b	0.52±0.09b	0.79±0.05b	1.04±0.15a
0.8	92.14±5.42c	0.47±0.02b	0.75±0.02b	1.11±0.12a