EFFECTS OF SEAWATER ON PHOTOSYNTHESIS AND CHLOROPHYLL FLUORESCENCE IN HELIANTHUS TUBEROSUS SEEDLINGS IN DIFFERENT REGIONS

doi:10.17521/cjpe.2006.0105

Abstract

Abstract:

Background and Aims Growing plants that are tolerant to saltwater is an option for use of coastal mudflats and application of seawater.

Methods Pot experiments were carried out to study the effects of the seawater on photosynthesis and chlorophyll Ⅱ fluorescence of Helianthus tuberosus seedlings from three different regions, Yancheng (YC), Wuwei (WW), and Yantai (YT). Three different concentrations of seawater were applied: 0 (CK), 15%, and 30% seawater.

Key Results Fresh and dry weights of roots and shoots of seedlings decreased with increasing seawater concentrations for all regions, but less at YC. Net photosynthetic rate (P_n), transpiration rate (T_r), water use efficiency (WUE), stomatal conductance (G_s), and stomatal limitation (L_s) decreased with increasing seawater concentration for all regions; however, intracellular CO₂ (C_i) increased with increasing seawater concentration. The P_n and T_r were the highest for YC, whereas WUE and C_i were lower and G_s and L_s were higher than those for WW and YT with the 15% seawater treatment. Minimal fluorescence (F_o), maximum fluorescence (F_m), variable fluorescence (F_v), stable fluorescence (F_s), difference between F_s and F_o (ΔF_o), PSⅡ potential fluorescence efficiency (F_v/F_o), and PSⅡ maximum fluorescence efficiency (F_v/F_m) all decreased with increasing seawater concentration. Values of F_m, F_v, F_s, and F_v/F_o were the highest for YC. Electronic transfer rate (ETR), photochemical quench (q_P), and photochemistry rate of YC leaves changed slightly. Compared to the controls, values for WW and YT all decreased markedly with 30% seawater and were lower than for YC. The PSⅡ actual fluorescence efficiency (Φ_PSⅡ) changed differently with different treatments. The Φ_PSⅡ for YC and WW was the highest with 15% seawater than other seawater concentration, and Φ_PSⅡ for YT was highest with CK. The Chla contents all decreased and Chlb contents changed slightly with increasing seawater concentration. The ratio of Chla and Chlb for WW and YC deceased with increasing seawater concentration, and the ratio for YT changed slightly with the 0 and 15% seawater treatments.

Conclusions Seawater suppressed the growth, photosynthesis, and chlorophyll Ⅱ fluorescence of H. tuberosus seedlings, and effects increased with increasing seawater concentration. Seedlings grown in the YC region were less affected by seawater than those in the WW and YT regions.

Key words: Helianthus tuberosus, Chlorophyll Ⅱ fluorescence, Photosynthesis, Treatment of seawater

LONG Xiao-Hua, LIU Zhao-Pu, JIANG Yun-Fang, CHEN Ming-Da, WANG Lin. EFFECTS OF SEAWATER ON PHOTOSYNTHESIS AND CHLOROPHYLL FLUORESCENCE IN HELIANTHUS TUBEROSUS SEEDLINGS IN DIFFERENT REGIONS[J]. Chin J Plant Ecol, 2006, 30(5): 827-834.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2006.0105

https://www.plant-ecology.com/EN/Y2006/V30/I5/827

Figures/Tables 5

Table 1 Effects of seawater treatment on biomass fresh weight (FW) and dry weight (DW) of aerial parts and roots of Helianthus tuberosus seedlings (g·plant-1)

处理 Treatment	0							15%						30%
	鲜重 FW			干重 DW				鲜重 FW		干重 DW				鲜重 FW		干重 DW
	根 Root	地上部 Shoot		根 Root	地上部 Shoot		根 Root		地上部 Shoot	根 Root	地上部 Shoot		根 Root	地上部 Shoot	根 Root	地上部 Shoot
武威 Wuwei	6.22^a		5.78^a	0.40^a		0.77^a		5.85^a	4.77^b	0.36^ab		0.65^b		5.09^b	3.59^c	0.32^b	0.55^c
盐城 Yancheng	7.65^a		6.26^a	0.50^a		0.88^a		7.40^a	5.97^a	0.48^a		0.87^a		6.75^b	4.53^b	0.41^b	0.72^b
烟台 Yantai	7.46^a		5.89^a	0.46^a		0.78^a		7.04^a	4.90^b	0.43^a		0.71^a		4.92^b	3.15^c	0.31^b	0.47^b

Fig.1 Effects of seawater treatment on net photosynthetic rate (Pn), transpiration rate (Tr), water use efficiency (WUE), internal CO2 concentration (Ci), stomatal conductance (Gs) and stomatal limitation (Ls) of Helianthus tuberosus seedling leaves

Fig.2 Effects of seawater treatment on minimal fluorescence (Fo), maximum fluorescence (Fm), variable fluorescence (Fv), stable fluorescence (Fs), difference between Fs and Fo (ΔFo), PSⅡ actual fluorescence efficiency (ΦPSⅡ) of Helianthus tuberosus seedling leaves Legends see Fig. 1

Fig.3 Effect of seawater treatment on electronic transfer rate (ETR), photochemical quench (qP) and photochemistry rate of Helianthus tuberosus seedling leaves Legends see Fig. 1

Fig.4 Effect of seawater treatment on chlorophyll a content, chlorophyll b content and ratio of chlorophyll a and chlorophyll b of Helianthus tuberosus seedling leaves Legends see Fig. 1

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