Effects of salt stress and phosphorus supply on physiological characteristics of switchgrass seedlings

doi:10.3969/j.issn.1004-1524.2022.06.11

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (6): 1205-1216.DOI: 10.3969/j.issn.1004-1524.2022.06.11

• Horticultural Science • Previous Articles Next Articles

Effects of salt stress and phosphorus supply on physiological characteristics of switchgrass seedlings

MA Zhonghua^a(), WU Na^a, CHEN Juan^a, ZHAO Cong^a, YAN Chenghong^a, LIU Jili^b^,^c^,^*()

a. College of Agriculture, Ningxia University, Yinchuan 750021, China
b. College of Ecology and Environment, Ningxia University, Yinchuan 750021, China
c. State Key Laboratory Breeding Base of Northwest Land Degradation and Ecological Restoration, Ningxia University, Yinchuan 750021, China

Received:2021-02-01 Online:2022-06-25 Published:2022-06-30
Contact: LIU Jili

Abstract

Abstract:

In order to clarify the physiological response characteristics of different switchgrass varieties to the two factors of salt stress and phosphorus supply level, this study adopted a hydroponic experiment with 2 salt stress levels (A1 salt stress, A2 non-salt stress) and 4 phosphorus supply levels (B1 no phosphorus, B2 low phosphorus, B3 high phosphorus, B4 full phosphorus) were set, the effects of salt stress and phosphorus supply levels on The results showed that the soluble sugar content of Alamo syndiploid, Alamo and Pathfinder decreased with the increase of the phosphorus supply level under salt stress conditions, and the total phosphorus treatment decreased by 40.80%, 26.47%, and 13.82% compared with the non-phosphorus treatment. The malondialdehyde (MDA) content of the three switchgrass varieties under salt stress reached the maximum under the high phosphorus treatment with the increase of the phosphorus supply level. The proline content of the three switchgrass varieties increased with the increase of the phosphorus supply level under salt stress, and the total phosphorus treatment increased by 136.79%, 193.85%, and 61.09% respectively compared with the non-phosphorus treatment. Under salt stress, the peroxidase (POD) activity of Alamo syndiploid and Alamo reached the maximum under the full phosphorus treatment with the increase of the phosphorus supply level; while POD activity of Pathfinder reached the maximum under the low phosphorus treatment. The superoxide dismutase (SOD) activity of Alamo syndiploid under salt stress reached the maximum under high phosphorus treatment with the increase of phosphorus supply level; the SOD activity of Alamo and Pathfinder under salt stress reached the maximum under low phosphorus treatment with the increase of phosphorus supply level value. The CAT activity of the three switchgrass varieties decreased with the increase of the phosphorus supply level under the salt stress condition. Compared with the non-phosphorus treatment, the catalase (CAT) activity decreased by 65.81%, 37.41%, and 90.66%. According to the comprehensive physiological stress resistance analysis of 3 switchgrass varieties, it was concluded that Pathfinder variety has the highest sum of comprehensive values under each treatment, indicating that Pathfinder has the strongest resistance to salt stress and low phosphorus stress at seedling stage and is suitable for planting in saline-alkali land.

Key words: salt stress, phosphorus supply level, physiological characteristics, principal component analysis

CLC Number:

MA Zhonghua, WU Na, CHEN Juan, ZHAO Cong, YAN Chenghong, LIU Jili. Effects of salt stress and phosphorus supply on physiological characteristics of switchgrass seedlings[J]. Acta Agriculturae Zhejiangensis, 2022, 34(6): 1205-1216.

Figures/Tables 17

References 31

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品种	生态类型	染色体倍数	原产地
Varieties	Ecotype	Ploidy level	Origin
Alamo	低地Lowland	四倍体Tetraploid	得克萨斯州南部Southern Texas 28°N
Alamo加倍体Alamo syndiploid	低地Lowland	八倍体 Octoploid	Alamo通过秋水仙素人工加倍Alamo doubled artificially with colchicine
Pathfinder	高地Upland	八倍体 Octoploid	内布拉斯加州堪萨斯州 Nebraska/Kansas 40°N

品种	生态类型	染色体倍数	原产地
Varieties	Ecotype	Ploidy level	Origin
Alamo	低地Lowland	四倍体Tetraploid	得克萨斯州南部Southern Texas 28°N
Alamo加倍体Alamo syndiploid	低地Lowland	八倍体 Octoploid	Alamo通过秋水仙素人工加倍Alamo doubled artificially with colchicine
Pathfinder	高地Upland	八倍体 Octoploid	内布拉斯加州堪萨斯州 Nebraska/Kansas 40°N

营养成分 Component	母液浓度Initial solution concentration/ (mol·L^-1)	溶液浓度 Solution concentration / （mmol·L^-1）	供磷水平Phosphorus level
营养成分 Component	母液浓度Initial solution concentration/ (mol·L^-1)	溶液浓度 Solution concentration / （mmol·L^-1）	P0/mL	-P/mL	+P/mL	P/mL
Ca(NO₃)₂·4H₂O	5	5.0	1	1	1	1
KNO₃	2.5	5.0	2	2	2	2
MgSO₄·7H₂O	2.5	2.5	1	1	1	1
KH₂PO₄	1	2.0	_	0.005	0.2	2
NaH₂PO₄	_	2.0	_	_	_	_
NaNO₃	_	5.0	_	_	_	_
MgCl₂	_	2.5	_	_	_	_
NaSO₄	_	2.5	_	_	_	_
CaCl₂	_	5.0	_	_	_	_
KCL	2.5	5.0	0.8	0.798	0.72	_
EDTA-FeNa	0.2	0.02	0.1	0.1	0.1	0.1
MnSO₄·H₂O	0.672 2	0.006 722	0.1	0.1	0.1	0.1
CuSO₄·5H₂O	0.003 16	0.000 316	0.1	0.1	0.1	0.1

营养成分 Component	母液浓度Initial solution concentration/ (mol·L^-1)	溶液浓度 Solution concentration / （mmol·L^-1）	供磷水平Phosphorus level
营养成分 Component	母液浓度Initial solution concentration/ (mol·L^-1)	溶液浓度 Solution concentration / （mmol·L^-1）	P0/mL	-P/mL	+P/mL	P/mL
Ca(NO₃)₂·4H₂O	5	5.0	1	1	1	1
KNO₃	2.5	5.0	2	2	2	2
MgSO₄·7H₂O	2.5	2.5	1	1	1	1
KH₂PO₄	1	2.0	_	0.005	0.2	2
NaH₂PO₄	_	2.0	_	_	_	_
NaNO₃	_	5.0	_	_	_	_
MgCl₂	_	2.5	_	_	_	_
NaSO₄	_	2.5	_	_	_	_
CaCl₂	_	5.0	_	_	_	_
KCL	2.5	5.0	0.8	0.798	0.72	_
EDTA-FeNa	0.2	0.02	0.1	0.1	0.1	0.1
MnSO₄·H₂O	0.672 2	0.006 722	0.1	0.1	0.1	0.1
CuSO₄·5H₂O	0.003 16	0.000 316	0.1	0.1	0.1	0.1

变异来源Source	Alamo加倍体Alamo syndiploid	Alamo	Pathfinder
A因素 A Level	*	NS	*
B因素 B Level	NS	NS	NS
A×B	*	*	*

Effects of salt stress and phosphorus supply on physiological characteristics of switchgrass seedlings

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主成分 Principal component	初始特征值 Initial eigenvalues			提取的主成分 The extracted principal component
主成分 Principal component	特征值 Eigenvalues	贡献率 Contribution rate/%	累积贡献率Cumulative contribution rate /%	特征值 Eigenvalues	贡献率 Contribution rate/%	累积贡献率Cumulative contribution rate/%
1	2.27	37.88	37.88	2.27	33.88	37.88
2	1.43	23.80	61.68	1.43	23.80	61.68
3	1.21	20.16	81.84	1.21	20.16	81.84
4	0.57	9.57	91.41
5	0.37	4.65	97.53
6	0.15	2.47	100.00

指标Index	PC1	PC2	PC3
SS	0.52	0.41	0.14
MDA	0.49	0.21	-0.35
PRO	0.50	0	0.39
POD	-0.13	0.03	0.84
SOD	0.44	-0.44	0.04
CAT	-0.15	0.77	0

品种 Variety	处理Treatment	PC1	PC2	PC3	综合值Comprehensive value（F）
Alamo加倍体Alamo syndiploid	A1B1	-0.58	2.66	-0.24	1.84
	A1B2	0.23	1.62	-1.09	0.76
	A1B3	0.44	1.44	-0.21	1.67
	A1B4	-0.48	0.66	1.15	1.34
	A2B1	-2.00	0.91	1.33	0.25
	A2B2	-2.78	-0.77	1.86	-1.69
	A2B3	-1.92	-0.84	1.28	1.48
	A2B4	-0.93	-0.16	0.02	-1.07
Alamo	A1B1	-0.30	1.66	-1.33	0.03
	A1B2	0.21	1.00	-1.01	0.20
	A1B3	0.07	0.63	-1.21	-0.50
	A1B4	0.38	0.56	0.69	1.62
	A2B1	-2.24	-0.62	0.56	-2.29
	A2B2	-1.29	-0.82	-0.44	-2.55
	A2B3	-0.60	-0.68	-0.86	-2.15
	A2B4	-0.29	-0.70	-1.23	-2.22
Pathfinder	A1B1	1.62	0.62	0.65	2.89
	A1B2	2.89	0.05	1.71	4.64
	A1B3	2.79	-0.45	1.38	3.72
	A1B4	2.78	-0.29	0.98	3.46
	A2B1	0.08	-1.40	-0.87	-2.19
	A2B2	0.57	-2.39	-0.44	-2.26
	A2B3	0.94	-1.48	-1.10	-1.64
	A2B4	0.42	-1.22	-1.58	-2.38

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