Responses to salt stress among different genotypes of tea Chrysanthemum

doi:10.3724/SP.J.1258.2013.00068

Abstract

Abstract:

Aims Our objective was to investigate the physiological response of tea Chrysanthemum cultivars to salt stress in order to select salt-tolerant cultivars for use in saline soil.
Methods Stress physiological, biochemical and photosynthetic physiological parameters were measured for four tea Chrysanthemum cultivars, which were irrigated with nutrient solution adding different concentrations of NaCl (40, 80, 120, 160 and 200 mmol·L^-1) as treatment and without addition of NaCl as control.
Important findings Following the increase with the degree of NaCl stress, data of relative membrane permeability (Cond), malonic aldehyde (MDA), proline (Pro) and soluble sugar (SS) content were increased in leaves of different genotypes of tea Chrysanthemum, while superoxide dismutase (SOD) activity was initially increased and then decreased. Leaf chlorophyll (Chl) content of the ‘Fanbailu’ and ‘Yurenmian’ cultivars were initially increased then decreased, but continued to decline in the ‘Ruhe’ and ‘Huangchulong’ cultivars. Net photosynthetic rate (P_n), transpiration rate (T_r) and stomatal conductance (G_s) were significantly reduced, but the stomatal limitation value was first increased and then decreased following the increase of salt concentrations. Values of subordinate function were used to evaluate the salt tolerance among different tea Chrysanthemum cultivars. The salinity tolerance for those cultivars was ‘Ruhe’ > ‘Yurenmian’ > ‘Fanbailu’ > ‘Huangchulong’. Under NaCl stress, parameters for Chl, P_n, T_r and G_s were decreased less in ‘Yurenmian’ and ‘Ruhe’ than in the other two cultivars while parameters for MDA content and stomatal limitation value were increased less in ‘Yurenmian’ and ‘Ruhe’ than in the other two cultivars.

Key words: NaCl stress, photosynthetic physiology, physiological response, salt tolerance, tea Chrysanthemum

LÜ Jin-Hui,REN Lei,LI Yan-Feng,WANG Xuan,ZHAO Xia-Lu,ZHANG Chun-Lai. Responses to salt stress among different genotypes of tea Chrysanthemum[J]. Chin J Plant Ecol, 2013, 37(7): 656-664.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2013.00068

https://www.plant-ecology.com/EN/Y2013/V37/I7/656

Figures/Tables 3

Fig. 1 Effect of NaCl on relative conductivity, malonic aldehyde (MDA) content, proline content, soluble sugar content, superoxide dismutase (SOD) activity, chlorophyll content (mean ± SD). Different uppercase letters and lowercase letters indicate significant difference at p < 0.01 and p < 0.05 levels, respectively.

Fig. 2 Effect of NaCl on net photosynthetic, transpiration rate, stomatal conductance, and stomatal limitation value (mean ± SD). Different letters indicate significant difference (p < 0.01).

Table 1 Value of subjection function, index weight and evaluation D of different genotypes of tea Chrysanthemum

品种 Cultivar	隶属函数值 Value of subjection function										综合值D Evaluation D	排序 Order
品种 Cultivar	Chl	Pro	Cond	SOD	SS	P_n	T_r	G_s	C_i	L_s	综合值D Evaluation D	排序 Order
‘乳荷’ ‘Ruhe’	0.498	0	1.000	0	0	0	0	0	0	0	0.227	1
‘玉人面’ ‘Yurenmian’	0	1.000	0.052	0.187	0.795	0.941	0.719	0.739	0.526	0.463	0.493	2
‘黄滁龙’ ‘Huangchulong’	1.000	0.967	0.351	1.000	1.000	1.000	1.000	0.963	1.000	0.835	0.904	4
‘繁白露’ ‘Fanbailu’	0.292	0.876	0	0.203	0.675	0.877	0.954	1.000	0.827	1.000	0.664	3
权重 Weight	0.100	0.054	0.031	0.204	0.107	0.065	0.071	0.055	0.104	0.045

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