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Acta Agronomica Sinica ›› 2024, Vol. 50 ›› Issue (5): 1193-1206.doi: 10.3724/SP.J.1006.2024.31049

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Applicability evaluation of screen methods to identify salt tolerance in wheat at germination and seedling stages

CHEN Jia-Ting(), BAI Xin, GU Yu-Jie, ZHANG Xiao-Wen, GUO Hui-Juan, CHANG Li-Fang, CHEN Fang, ZHANG Shu-Wei, ZHANG Xiao-Jun, LI Xin, FENG Rui-Yun, CHANG Zhi-Jian, QIAO Lin-Yi*()   

  1. College of Agriculture, Shanxi Agricultural University / Shanxi Key Laboratory of Crop Genetics and Molecular Improvement / Key Laboratory of Sustainable Dryland Agriculture (co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Taiyuan 030031, Shanxi, China
  • Received:2023-08-31 Accepted:2024-01-12 Online:2024-05-12 Published:2024-01-29
  • Contact: E-mail: linyi.qiao@sxau.edu.cn
  • Supported by:
    Science and Technology Development Foundation of Central Guides Local Government Project(YDZJSX2022A046);Shanxi Scholarship Council of China(2021-070);Shanxi Agricultural University Research Project for Doctor(2021BQ39)

Abstract:

Salt tolerance identification is the premise of screening germplasm and breeding salt-tolerant wheat varieties. There are many methods for testing salt tolerance of wheat indoor, involving different growth stages and tissues or organs. In order to evaluate the applicability of these methods in production, we selected five salt-tolerant varieties and five salt-sensitive varieties from the Northern Winter Wheat Production Area of China to compare seven identification methods (involving 27 parameters) for the responses to salt stress of wheat at germination and seedling stages. The results showed that the relative salt-injury rate for germination of grains could not distinguish the tolerant- and sensitive-varieties, while the salt-injury index of leaf, the Na+ and K+ fluxes of root, and the relative salt-injury rates for root tip number, root diameter as well as leaf K+ content of seedlings were significantly different between the tolerant- and sensitive-varieties. Based on the results of regressive analysis and operability, the salt-injury index of leaf was considered to be an appropriate method for identifying salt tolerance that with high applicability in the Northern Winter Wheat Production Area, which can be used for germplasm screening or variety breeding by integrating the relative salt-injury rate for root tip number or leaf K+ content, and the Na+ or K+ flux of root. This study analyzed and evaluated

the salt tolerance identification methods from the aspect of application, and provide reference information for salt tolerance breeding in wheat.

Key words: wheat, salt-tolerance identification, method evaluation, germination stage, seedling stage

Table 1

10 varieties with reported salt tolerance in the Northern Winter Wheat Production Area of China"

育成品种
Variety
耐盐性
Salt tolerance
参考文献
Reference
审定编号
Approval number
小偃60 Xiaoyan 60 耐盐 Tolerant [18] 国审麦20220069 Guoshenmai 20220069
青麦6号 Qingmai 6 耐盐 Tolerant [19] 国审麦2016027 Guoshenmai 2016027
沧麦6005 Cangmai 6005 耐盐 Tolerant [20] 冀审麦2012007 Jishenmai 2012007
山融3号 Shanrong 3 耐盐 Tolerant [21] 鲁农审字[2004] 030 Lunongshenzi [2004] 030
德抗961 Dekang 961 耐盐 Tolerant [22,23] 鲁农审字[2004] 031 Lunongshenzi [2004] 031
中麦175 Zhongmai 175 盐敏感 Sensitive [18] 国审麦2011018 Guoshenmai 2011018
鲁原502 Luyuan 502 盐敏感 Sensitive [24] 国审麦2011016 Guoshenmai 2011016
京411 Jing 411 盐敏感 Sensitive [22,25] 1991年通过北京市品种审定 Passed variety approval in Beijing in 1991
河农6425 Henong 6425 盐敏感 Sensitive [17] 冀审麦200901 Jishenmai 200901
济麦20 Jimai 20 盐敏感 Sensitive [26] 鲁农审字[2003] 029 Lunongshenzi [2003] 029

Fig. 1

Comparison of germination between tolerant and sensitive varieties under salt stress (a) GR: germination rate; **: P<0.01; ****: P<0.0001. (b) RSIR-G: the relative salt-injury rate for germination; T: tolerant varieties; S: sensitive varieties."

Fig. 2

Comparison of root salt-injury phenotypes between tolerant and sensitive varieties at seedling stage RtL: root total length; RsA: root surface area; RV: root volume; RD: root diameter; RTN: root tips number; RFN: root forks number; RSIR-RP: the relative salt-injury rate for root phenotypes. *: P < 0.05; **: P < 0.01; T: tolerant varieties; S: sensitive varieties."

Fig. 3

Comparison of ions-flux in the roots between tolerant and sensitive varieties under salt stress at seedling stage ***: P < 0.001, ****: P < 0.0001; T: tolerant varieties; S: sensitive varieties."

Table S1

Phenotype data for salt tolerance of ten tested varieties used in this study"

表型
Phenotype
耐盐品种 Salt-tolerant varieties 盐敏感品种 Salt-sensitive varieties
小偃
60
XY60
青麦
6号
QM6
沧麦6005
CM6005
山融
3号
SR3
德抗
961
DK961
中麦
175
ZM175
鲁原502
LY502

411
J411
河农6425
HN6425
济麦
20
JM20
发芽率 CK (%) 97.00 98.00 100.00 100.00 100.00 100.00 100.00 100.00 83.75 100.00
Germination rate NaCl (%) 53.61 41.31 74.42 62.31 61.77 62.62 38.36 41.06 19.14 83.75
RSIR (%) 44.73 57.85 25.58 37.69 38.23 37.38 61.64 58.94 77.15 16.25
总根长 CK (cm) 73.64 34.26 45.23 65.84 62.44 33.15 35.23 34.26 52.67 78.66
Root total length NaCl (cm) 37.76 22.62 30.91 32.56 43.20 22.30 16.67 26.27 31.57 33.99
RSIR (%) 48.72 33.98 31.65 50.54 30.81 32.75 52.68 23.31 40.07 56.79
根表面积 CK (cm2) 7.53 5.14 6.45 10.25 4.13 4.33 4.90 4.59 7.77 11.00
Root surface area NaCl (cm2) 3.05 2.95 4.08 4.92 3.25 3.82 2.30 3.60 4.60 4.83
RSIR (%) 59.52 42.68 36.71 51.97 21.44 11.82 53.06 21.65 40.89 56.03
根体积 CK (cm3) 0.08 0.06 0.07 0.13 0.07 0.05 0.05 0.05 0.09 0.12
Root volume NaCl (cm3) 0.03 0.03 0.04 0.06 0.04 0.03 0.03 0.04 0.05 0.06
RSIR (%) 62.44 50.05 41.85 53.75 42.02 30.10 53.33 19.59 41.92 55.43
根径 CK (mm) 0.42 0.48 0.46 0.50 0.42 0.42 0.45 0.43 0.47 0.45
Root diameter NaCl (mm) 0.42 0.41 0.42 0.48 0.31 0.42 0.43 0.44 0.46 0.45
RSIR (%) 7.73 14.05 8.33 2.35 25.99 -1.11 3.73 -1.05 1.57 -0.40
根尖数 CK 91.50 56.00 45.60 89.20 82.30 43.20 53.00 79.60 109.60 114.40
Root tips number NaCl 53.32 30.60 23.66 44.00 50.35 21.24 16.20 44.62 45.60 41.40
RSIR (%) 41.73 45.36 48.11 50.67 38.82 50.84 69.43 43.95 58.39 63.81
根分叉数 CK 63.52 45.33 35.80 72.80 55.31 49.20 35.67 53.00 51.00 80.00
Root forks number NaCl 9.01 24.40 18.95 39.00 32.19 14.90 15.00 39.40 41.20 23.40
RSIR (%) 95.81 46.18 -21.23 46.43 41.80 -37.68 57.94 25.66 19.22 70.75
离子流速
Ions-flux
K+-flux
(pmol cm-2 s-1)
-215.06 -240.00 -67.11 -120.38 -166.78 -46.65 -67.03 -176.05 -181.43 -195.29
Na+-flux
(pmol cm-2 s-1)
607.06 448.07 792.54 1589.41 385.65 523.28 347.25 1922.13 -89.79 102.16
叶部盐害指数
Salt-injury index of leaves (%)
51.61 42.09 22.50 40.54 39.19 58.79 43.75 57.61 58.22 55.00
根鲜重 CK (mg) 76.98 61.44 142.57 90.93 92.98 39.94 96.33 85.70 111.04 196.58
Fresh weight of root NaCl (mg) 43.62 39.22 43.47 48.56 47.51 31.73 49.90 43.06 61.28 66.26
RSIR (%) 43.34 36.17 69.51 46.60 48.90 20.56 48.20 49.75 44.81 66.29
地上部鲜重 CK (mg) 251.52 194.36 512.82 422.36 345.26 171.30 230.67 338.74 315.58 621.13
Fresh weight of shoot NaCl (mg) 120.98 108.78 190.32 151.66 152.86 90.73 69.60 153.30 159.23 183.51
RSIR (%) 51.90 44.03 62.89 64.09 55.73 47.04 69.83 54.74 49.54 70.46
鲜重根冠比 CK (%) 30.61 31.77 25.46 21.51 27.34 23.19 30.92 24.31 35.21 31.47
Ratio of FW-R/FW-S NaCl (%) 36.05 36.32 22.81 32.03 32.16 31.96 34.48 28.09 39.27 38.48
RSIR (%) -17.79 -14.33 10.41 -48.90 -17.65 -37.83 -11.50 -15.54 -11.51 -22.28
根干重 CK (mg) 28.80 34.58 16.85 21.67 25.48 4.61 23.93 20.12 21.80 64.66
Dry weight of root NaCl (mg) 12.33 4.45 7.37 19.16 11.96 5.51 5.00 9.08 7.60 10.43
RSIR (%) 57.18 87.13 56.26 11.58 53.04 -19.51 79.11 54.87 65.14 83.87
地上部干重 CK (mg) 71.40 42.71 66.48 51.37 57.99 10.71 92.67 142.55 78.05 182.83
Dry weight of shoot NaCl (mg) 24.93 17.22 25.31 35.56 26.46 10.21 17.80 106.40 24.52 33.96
RSIR (%) 65.08 59.68 61.93 30.78 54.37 4.67 80.79 25.36 68.58 81.43
干重根冠比 CK (%) 40.34 42.47 25.39 44.79 55.33 43.71 25.83 66.08 27.76 28.19
Ratio of DW-R/DW-S NaCl (%) 49.47 25.68 29.18 52.51 52.29 54.08 28.09 15.25 30.86 30.88
RSIR (%) -22.63 39.53 -14.92 -17.23 5.51 -23.73 -8.76 76.93 -11.16 -9.54
根中K+含量 CK (mg g-1) 7.65 8.26 8.17 7.60 7.14 7.60 7.86 7.14 7.76 6.69
K+ contents in root NaCl (mg g-1) 8.04 8.04 7.86 8.56 7.74 7.05 8.84 7.19 8.74 6.42
RSIR (%) -5.02 2.68 3.74 -12.72 -8.39 7.23 -12.46 -0.74 -12.63 3.99
茎中K+含量 CK (mg g-1) 25.24 23.25 26.38 24.48 24.25 26.25 24.59 24.87 25.77 26.07
K+ contents in stem NaCl (mg g-1) 25.87 24.87 25.45 26.69 27.82 25.19 25.13 26.38 25.05 26.92
RSIR (%) -2.50 -6.98 3.52 -9.05 -14.76 4.05 -2.19 -6.09 2.81 -3.23
叶中K+含量 CK (mg g-1) 27.33 26.64 29.47 28.43 27.63 30.48 27.67 29.44 30.66 31.99
K+ contents in leaf NaCl (mg g-1) 29.98 29.35 30.75 31.99 31.24 30.03 30.35 29.47 30.15 31.01
RSIR (%) -9.67 -10.18 -4.32 -12.53 -13.07 1.46 -9.69 -0.11 1.65 3.06
根中Na+含量 CK (mg g-1) 4.64 5.24 5.17 4.03 4.33 4.51 5.63 5.12 4.39 4.07
Na+ contents in root NaCl (mg g-1) 4.91 5.01 5.07 4.71 4.84 4.71 5.81 4.37 4.96 4.31
RSIR (%) -6.00 4.24 2.05 -17.09 -11.98 -4.59 -3.34 14.67 -12.92 -5.98
茎中Na+含量 CK (mg g-1) 2.80 3.20 3.26 2.59 2.60 2.43 3.34 3.42 2.90 2.68
Na+ contents in stem NaCl (mg g-1) 2.85 3.25 2.68 2.35 2.78 3.16 3.48 3.09 2.93 2.42
RSIR (%) -1.97 -1.72 17.82 9.29 -6.85 -29.84 -4.16 9.48 -1.00 9.50
叶中Na+含量 CK (mg g-1) 2.28 2.44 2.26 1.88 2.13 1.72 2.65 2.35 2.04 2.28
Na+ contents in leaf NaCl (mg g-1) 2.56 2.66 1.72 1.56 2.36 2.53 2.75 2.18 2.03 1.72
RSIR (%) -12.11 -8.94 24.06 17.24 -10.55 -47.12 -4.00 7.31 0.54 24.82
根中K+与Na+的含量比 CK 1.65 1.58 1.58 1.89 1.65 1.69 1.40 1.39 1.77 1.65
Ratio of K+ and Na+
contents in root
NaCl 1.64 1.60 1.55 1.82 1.60 1.50 1.52 1.65 1.76 1.49
RSIR (%) 0.92 -1.63 1.72 3.74 3.20 11.30 -8.82 -18.07 0.26 9.41
茎中K+与Na+的含量比 CK 9.02 7.27 8.10 9.44 9.33 10.79 7.36 7.28 8.88 9.75
Ratio of K+ and Na+
contents in stem
NaCl 9.07 7.65 9.52 11.34 10.02 7.97 7.22 8.53 8.54 11.12
RSIR (%) -0.52 -5.17 -17.40 -20.22 -7.40 26.10 1.89 -17.20 3.77 -14.06
叶中K+与Na+的含量比 CK 11.99 10.92 13.04 15.13 12.96 17.75 10.45 12.51 15.02 14.01
Ratio of K+ and Na+
contents in leaf
NaCl 11.73 11.04 17.91 20.57 13.26 11.89 11.02 13.51 14.85 18.06
RSIR (%) 2.18 -1.14 -37.37 -35.98 -2.27 33.02 -5.47 -8.00 1.12 -28.95
根中脯氨酸含量 CK (μg g-1) 25.20 30.66 18.28 16.58 24.93 20.33 36.91 10.31 24.18 22.15
Proline contents in root NaCl (μg g-1) 964.23 570.92 521.75 338.13 251.10 625.37 708.36 436.70 347.56 184.11
RSIR (%) 97.39 94.63 96.50 95.10 90.07 96.75 94.79 97.64 93.04 87.97
叶中脯氨酸含量 CK (μg g-1) 11.46 14.68 2.78 14.79 45.07 29.62 32.25 28.80 3.63 1.05
Proline contents in leaf NaCl (μg g-1) 1555.03 1457.10 297.47 437.31 534.29 363.77 381.59 669.70 934.29 1821.49
RSIR (%) 99.26 98.99 99.06 96.62 91.56 91.86 91.55 95.70 99.61 99.94

Fig. 4

Comparison of salt-injury index (SJ-L) of leaves between tolerant and sensitive varieties *: P < 0.05; T: tolerant varieties; S: sensitive varieties."

Fig. 5

Comparison of seedling biomass between tolerant and sensitive varieties under salt stress FW-R: fresh weight of root; FW-S: fresh weight of shoot; FW-R/S: the ratio of FW-R/FW-S; DW-R: dry weight of root; DW-S: dry weight of shoot; DW-R/S: the ratio of DW-R/DW-S; RSIR-B: the relative salt-injury rate for biomass. *: P < 0.05; **: P < 0.01; ***: P < 0.001; T: tolerant varieties; S: sensitive varieties."

Fig. 6

Comparison of ion contents in different tissues between tolerant and sensitive varieties under salt stress at seedling stage a-c: K+ contents in root, stem, and leaf; d-f: Na+ contents in root, stem, and leaf; g-i: ratio of K+ and Na+ contents in root, stem, and leaf; j: the relative salt-injury rate for ion content (RSIR-IC). *: P < 0.05; **: P < 0.01; T: tolerant varieties; S: sensitive varieties."

Fig. 7

Comparison of proline contents in different tissues between tolerant and sensitive varieties under salt stress at seedling stage a: proline contents in root; b: proline contents in leaf; c: RSIR-P in root and leaf. *: P < 0.05; **: P < 0.01; T: tolerant varieties; S: sensitive varieties."

Fig. 8

Regression analysis among parameters identified in this study The numbers in the lower left corner are the P-values, and the numbers in the upper right corner are the coefficient of determination R2 values which filled in red. Parameters with significant differences between salt-tolerant and -sensitive varieties tested in this study are marked in blue."

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