Responses of Four Rice Varieties to Elevated CO2 and Different Salinity Levels

doi:10.1016/j.rsci.2018.04.002

Abstract

Abstract:

This study was carried out in 2014 at Isfahan University of Technology, Iran, to evaluate the responses of four rice varieties (Neda, Deylamani, Shiroudi and Domsorkh) to ambient (360 ± 50 µmol/mol) and elevated (700 ± 50 µmol/mol) air carbon dioxide (CO₂) concentrations under four salinity levels (0, 30, 60 and 90 mmol/L NaCl). There was significant variation among rice varieties in response to elevated CO₂concentration under the four salinity levels. Under non-saline condition, elevated CO₂increased the dry weight of Neda, Deylamani and Domsorkh by 8%, 50% and 8%, respectively, but reversely decreased that of Shiroudi by 34%. Increasing CO₂concentration significantly reduced the negative effects of salinity on Shiroudi, but these effects were even increased in Deylamani and Domsorkh under all the salinity levels and in Neda only under 30 and 60 mmol/L NaCl. Significant correlations were established between plant dry weight, SPAD value and leaf area under both CO₂ levels. However, this trend was observed only at ambient CO₂ concentration in the presence of soluble carbohydrates. The results revealed the genotype and salinity dependence of the effects of CO₂ concentrations on the rice traits investigated.

Key words: CO₂ concentration, genetic diversity, salt tolerance, water soluble carbohydrate

Kazemi Sheidollah, Reza Eshghizadeh Hamid, Zahedi Morteza. Responses of Four Rice Varieties to Elevated CO₂ and Different Salinity Levels[J]. Rice Science, 2018, 25(3): 142-151.

Figures/Tables 4

References 67

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	df	Mean of square
	df	Plant leaf area	SPAD value	MDA concentration	WSC content	Total dry weight
CO₂)C)	1	1 852.0**	26.0**	0.160**	2 827**	0.07
Error a	4	17	4.4**	0.001	368**	0.02
Variety (V)	3	1 850.0**	174.0**	0.540**	732**	4.40**
Salinity (S)	3	1 3924.0**	185.0**	0.270**	8 830**	5.90**
V × S	9	127.0**	6.4**	0.011**	1 668**	0.16**
C × V	3	358.0**	0.3	0.001	517**	0.24**
C × S	3	571.0**	30.0**	0.020**	34	0.08
C × S × V	9	173.0**	4.0**	0.020**	329**	0.23**
Error b	60	12.8	1.6	0.001	104	0.04
CV		8.1	3.2	7.5	5.7	18.6

	df	Mean of square
	df	Plant leaf area	SPAD value	MDA concentration	WSC content	Total dry weight
CO₂)C)	1	1 852.0**	26.0**	0.160**	2 827**	0.07
Error a	4	17	4.4**	0.001	368**	0.02
Variety (V)	3	1 850.0**	174.0**	0.540**	732**	4.40**
Salinity (S)	3	1 3924.0**	185.0**	0.270**	8 830**	5.90**
V × S	9	127.0**	6.4**	0.011**	1 668**	0.16**
C × V	3	358.0**	0.3	0.001	517**	0.24**
C × S	3	571.0**	30.0**	0.020**	34	0.08
C × S × V	9	173.0**	4.0**	0.020**	329**	0.23**
Error b	60	12.8	1.6	0.001	104	0.04
CV		8.1	3.2	7.5	5.7	18.6

Trait	CO₂ concentration (µmol/mol)
Trait	360	720
SPAD value	0.70**	0.71**
PLA	0.78**	0.72**
MDA concentration	0.03	-0.09
WSC content	0.41**	0.26

Trait	CO₂ concentration (µmol/mol)
Trait	360	720
SPAD value	0.70**	0.71**
PLA	0.78**	0.72**
MDA concentration	0.03	-0.09
WSC content	0.41**	0.26

Responses of Four Rice Varieties to Elevated CO₂ and Different Salinity Levels

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Variety	Salinity (mmol/L)	Plant leaf area (cm²)			SPAD value			MDA concentration (μmol/g)			WSC content (mg/mL)
Variety	Salinity (mmol/L)	A	B	Mean	A	B	Mean	A	B	Mean	A	B	Mean
Shiroudi	0	80	70	75	38	37	38	0.29	0.33	0.31	189	193	191
	30	59	43	51	37	39	38	0.34	0.41	0.38	195	230	213
	60	31	34	33	34	38	36	0.38	0.53	0.46	163	200	181
	90	11	21	16	32	33	33	0.47	0.55	0.51	134	155	144
Neda	0	61	69	65	41	39	40	0.26	0.34	0.3	201	227	214
	30	49	36	43	39	38	39	0.28	0.4	0.34	191	196	194
	60	39	19	29	34	38	36	0.45	0.56	0.51	160	151	156
	90	15	18	17	34	37	36	0.59	0.54	0.57	138	136	137
Deylamani	0	56	69	63	43	43	43	0.64	0.39	0.52	178	192	185
	30	51	34	43	42	40	41	0.69	0.82	0.76	182	197	190
	60	38	31	35	36	39	38	0.72	0.92	0.67	187	201	194
	90	24	18	21	35	37	36	0.7	0.95	0.83	166	165	166
Domsorkh	0	87	70	79	44	43	44	0.44	0.54	0.49	179	170	175
	30	80	50	65	42	42	42	0.5	0.58	0.54	176	172	174
	60	51	39	45	41	42	42	0.61	0.7	0.66	177	188	182
	90	38	27	33	37	40	39	0.61	0.73	0.67	149	166	157
Mean		48 a	40 b		38 a	39 a		0.48 b	0.58 a		172 a	183 b
LSD_0.05(C × S × V)		5.8			2			0.05			17.5
LSD_0.05(S × V)		3.9			1.3			0.04			12.4

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