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Acta Agronomica Sinica ›› 2022, Vol. 48 ›› Issue (2): 367-379.doi: 10.3724/SP.J.1006.2022.04283

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

Identification of salt tolerance and screening of salt tolerant germplasm of mungbean (Vigna radiate L.) at seedling stage

HU Liang-Liang(), WANG Su-Hua(), WANG Li-Xia, CHENG Xu-Zhen*(), CHEN Hong-Lin*()   

  1. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2020-12-28 Accepted:2021-04-26 Online:2022-02-12 Published:2021-05-18
  • Contact: CHENG Xu-Zhen,CHEN Hong-Lin E-mail:931629850@qq.com;wangsuhua@caas.cn;chengxuzhen@caas.cn;chenhonglin@caas.cn
  • Supported by:
    This study was supported by the National Key Research and Development Program of China(2019YFD1000702);This study was supported by the National Key Research and Development Program of China(2019YFD1000700);the Agricultural Science and Technology Innovation Program (ASTIP) in CAAS, the Crop Germplasm Resources Protection(2019NWB036-07);the National Infrastructure for Crop Germplasm Resources Project from the Ministry of Science and Technology of China(NICGR2019);the China Agriculture Research System(CARS-08)

Abstract:

Soil salinization has become one of the important factors affecting agricultural production in China. It is of great significance to screen germplasm resources of mungbean [Vigna radiate (L.) Wilczek] for the utilization of salinized land. In the present study, the seedlings of 346 domestic and foreign collections of mungbean were exposed to 150 mmol L -1 NaCl. To evaluate the salt-tolerance of different mungbean genotypes at seedling stage, 12 indicators were calculated, including plant height, fresh weight of above-ground part, fresh weight of root, dry weight of above-ground part, dry root weight, root length, and root volume. Salt tolerance of each sample was comprehensively evaluated and classified by principal component analysis, membership function analysis, salt tolerance comprehensive evaluation, and cluster analysis; and the regression equation of salt tolerance prediction was established by stepwise regression analysis. The results revealed that there were significant differences between treatment group and control group in each trait evaluation index, and the salt tolerance coefficients of the 12 indicators were correlated to some content. Combining the classification of salt damage symptoms and the comprehensive evaluation results of salt tolerance, 26 mungbean germplasms with high salt tolerance, 65 germplasms with high salt tolerance, 74 germplasms with salt sensitive, and 18 germplasms with extremely salt sensitive were selected at seedling stage. Among them, 10 varieties such as C04125 from Jiangxi and C06310 from the Philippines had the strongest salt tolerance, which could be used as excellent resources for mungbean salt tolerance breeding. Above-ground fresh weight, root fresh weight, root dry weight, root length, root volume, and root branch number could be used to predict salt tolerance of mungbean at seedling stage.

Key words: mungbean [Vigna radiate (L.) Wilczek], germplasm resources, seeding stage, salt tolerance, comprehensive evaluation

Table 1

Symptoms of mungbean at seedling stage under salt stress"

等级
Grade
耐盐性
Salt tolerance
表型特征
Symptom
1 高耐盐
Highly salt-tolerant
生长正常, 未出现盐害症状。
Normal growth, no symptoms were observed.
3 耐盐
Salt-tolerant
生长基本正常, 少数叶片边缘出现青枯或卷缩。
The growth is basically normal, and a few leaves appear withered or curled on the edge.
5 中耐盐
Mediumly salt-tolerant
叶片面积一半左右出现青枯或卷缩。
About half of the leaf area appear withered or curled.
7 敏感
Salt-sensitive
叶片大部分面积干枯坏死, 生长严重受阻。
Most of the leaves are dry and necrotic, and the growth is severely blocked.
9 高敏感
Highly salt-sensitive
严重受害, 植株完全枯萎。
Severely damaged, the plant is completely withered.

Fig. 1

Standard of individual classification for salt tolerance at seedling stage 1: highly salt-tolerant, normal growth, no symptoms were observed; 3: salt-tolerant, the growth was basically normal, and a few leaves appeared withered or curled on the edge; 5: mediumly salt-tolerant, about half of the leaf area appeared withered or curled; 7: salt-sensitive, most of the leaves were dry and necrotic, and growth was severely blocked; 9: highly salt-sensitive, severely damaged, the plant was completely withered."

Fig. 2

Phenotypic differences of 12 traits under normal and salt stress conditions CK: control; ST: salt treatment; PH: plant height; AFW: above-ground fresh weight; RFW: root fresh weight; ADW: above-ground dry weight; RDW: root dry weight; RL: root length; RSA: root surface area; RAD: root average diameter; RLPV: root length per volume; RV: root volume; RT: root tips; RF: root forks. **: P < 0.01."

Table 2

Descriptive statistics of saline tolerance index of mungbean traits under salt stress"

性状
Trait
最小值
Min.
最大值
Max.
平均值
Mean
标准差
SD
变异系数
CV (%)
PH 0.355 0.998 0.730 0.14 19.08
AFW 0.159 1.104 0.596 0.23 39.42
RFW 0.113 1.044 0.684 0.22 32.30
ADW 0.206 1.077 0.711 0.19 26.54
RDW 0.220 0.998 0.713 0.19 26.08
RL 0.156 1.026 0.633 0.24 37.86
RSA 0.148 1.134 0.719 0.21 28.62
RAD 0.574 1.144 0.873 0.08 9.61
RLPV 0.156 1.053 0.630 0.24 37.61
RV 0.140 1.085 0.796 0.18 22.73
RT 0.049 0.998 0.647 0.27 42.11
RF 0.112 0.999 0.607 0.24 40.12

Table 3

Correlation analysis of saline tolerance index of mungbean traits under salt stress"

性状
Trait
PH AFW RFW ADW RDW RL RSA RAD RLPV RV RT
AFW 0.53*
RFW 0.17 0.40*
ADW 0.64* 0.74** 0.21
RDW 0.45* 0.63* 0.75** 0.61*
RL 0.46* 0.40* 0.40* 0.44* 0.52*
RSA 0.31 0.39 0.46* 0.35 0.52* 0.93**
RAD -0.58* -0.21 -0.06 -0.40* -0.24 -0.57* -0.26
RLPV 0.46* 0.40* 0.40* 0.44* 0.52* 0.99** 0.93** -0.57*
RV 0.08 0.30 0.46* 0.19 0.44* 0.71** 0.91** 0.13 0.71**
RT 0.38 0.34 0.18 0.37 0.35 0.72** 0.60* -0.57* 0.72** 0.38
RF 0.37 0.34 0.35 0.38 0.44* 0.90 ** 0.87** -0.45* 0.90** 0.69* 0.66*

Table 4

Eigen values and eigenvectors of the first five principal components"

性状
Trait
主成分因子 Comprehensive factors
F1 F2 F3 F4 F5
PH -0.22 0.46 0.10 -0.04 -0.57
AFW -0.23 0.38 -0.24 -0.37 0.39
RFW -0.19 -0.02 -0.53 0.55 0.07
ADW -0.23 0.48 -0.10 -0.34 0.04
RDW -0.26 0.19 -0.41 0.36 0.01
RL -0.38 -0.15 0.15 0.02 -0.10
RSA -0.36 -0.28 -0.03 -0.13 -0.12
RAD 0.20 -0.26 -0.51 -0.43 0.03
RLPV -0.38 -0.15 0.15 0.02 -0.10
RV -0.37 -0.39 -0.25 -0.31 -0.13
RT -0.30 -0.04 0.31 0.08 0.67
RF -0.37 -0.19 0.13 -0.04 -0.07
特征值Eigen values 6.29 2.01 1.59 0.82 0.45
贡献率Contribution rate (%) 52.39 16.78 13.24 6.80 3.71
累计贡献率Accumulative contribution rate (%) 52.39 69.18 82.41 89.21 92.93

Table 5

D-value of salt tolerance of different genotypes of mungbean"

品种
Variety
D
D-value
排名
Rank
品种
Variety
D
D-value
排名
Rank
品种
Variety
D
D-value
排名
Rank
品种
Variety
D
D-value
排名
Rank
C05290 0.663 164 C03069 0.592 253 C06292 0.741 44 C06227 0.568 270
C05495 0.747 36 C03070 0.549 283 C06293 0.758 21 C06228 0.541 291
C05506 0.683 126 C03071 0.708 96 C06294 0.699 105 C06230 0.663 165
C05668 0.678 135 C03072 0.602 241 C06295 0.703 99 C06231 0.406 340
C05786 0.513 308 C03078 0.609 232 C06296 0.769 12 C06232 0.547 285
C05787 0.762 19 C03079 0.702 101 C06297 0.757 23 C06233 0.502 313
C05798 0.526 300 C03086 0.621 223 C06298 0.538 293 C06234 0.453 331
C06117 0.748 35 C03090 0.669 151 C06299 0.792 4 C06235 0.562 275
C06118 0.626 219 C03094 0.740 47 C06300 0.413 339 C06236 0.724 65
C05788 0.722 67 C03140 0.720 75 C06302 0.740 46 C06237 0.663 162
C06397 0.631 210 C03606 0.538 294 C06303 0.789 5 C06238 0.643 188
C06396 0.664 159 C03656 0.717 88 C06304 0.458 328 C06241 0.642 190
C06386 0.632 208 C03608 0.545 289 C06305 0.636 201 C06242 0.341 343
C05636 0.674 140 C03609 0.772 8 C06306 0.727 60 C06243 0.631 211
C06398 0.711 94 C03610 0.754 28 C06307 0.615 229 C06244 0.582 261
C06390 0.746 38 C03601 0.768 13 C06308 0.756 25 C06246 0.561 277
C06391 0.744 39 C03651 0.682 128 C06309 0.547 286 C06247 0.664 161
C05503 0.583 260 C03273 0.755 26 C06310 0.804 2 C06248 0.607 236
C06392 0.717 83 C03279 0.777 7 C06311 0.721 71 C06249 0.522 301
C06393 0.796 3 C03280 0.719 78 C06312 0.743 40 C06251 0.657 173
C06394 0.751 31 C03284 0.733 56 C06313 0.740 48 C06253 0.575 266
C06383 0.567 271 C03289 0.638 197 C06314 0.738 50 C06254 0.477 321
C06384 0.672 146 C03304 0.670 149 C06315 0.673 145 C06255 0.719 77
C05249 0.507 311 C03305 0.432 336 C06316 0.721 69 C06256 0.533 295
C05248 0.726 62 C03312 0.695 108 C06317 0.695 106 C06257 0.643 189
C06385 0.664 160 C03316 0.741 45 C06318 0.454 329 C06258 0.717 86
C04717 0.720 76 C03319 0.695 107 C06319 0.638 196 C06259 0.512 309
C06387 0.736 54 C03320 0.680 131 C06320 0.501 314 C06260 0.662 167
C06389 0.657 175 C03334 0.715 91 C06321 0.462 327 C06261 0.437 334
C06388 0.740 49 C03380 0.748 34 C06322 0.596 248 C06262 0.520 302
C05635 0.751 30 C03381 0.674 138 C06323 0.750 32 C06263 0.454 330
C05637 0.715 92 C03383 0.685 120 C06324 0.653 179 C06264 0.516 306
C06402 0.716 90 C03384 0.639 195 C06325 0.607 234 C06265 0.648 185
C03413 0.684 121 C03385 0.721 70 C06326 0.699 104 C06266 0.588 257
C03416 0.721 72 C03397 0.472 323 C06327 0.607 235 C06267 0.432 335
C06395 0.685 119 C03399 0.684 123 C06328 0.584 259 C06268 0.741 43
C06405 0.547 284 C03400 0.769 11 C06329 0.500 316 C06269 0.466 325
C05179 0.701 103 C03401 0.590 256 C06330 0.615 228 C06270 0.770 10
C06179 0.562 276 C03402 0.768 15 C06331 0.718 81 C06271 0.645 187
C06403 0.665 158 C03405 0.723 66 C06332 0.768 14 C06272 0.618 226
C06404 0.725 63 C03434 0.674 141 C06333 0.720 74 C06273 0.576 264
C03414 0.635 202 C03435 0.684 122 C06334 0.683 124 C06274 0.667 155
C04702 0.687 116 C03436 0.725 64 C06335 0.682 127 C06275 0.566 274
C03923 0.759 20 C03440 0.757 22 C06336 0.547 287 C06276 0.717 89
C00376 0.573 267 C03441 0.547 288 C06337 0.633 204 C06277 0.711 93
C00377 0.681 130 C03442 0.593 251 C06338 0.722 68 C06278 0.658 172
C00381 0.637 199 C03471 0.754 29 C06339 0.718 82 C06279 0.476 322
C00385 0.516 304 C03472 0.702 102 C06340 0.632 206 C06280 0.552 281
C00389 0.554 279 C03484 0.632 207 C06341 0.479 320 C05900 0.566 273
C00391 0.707 97 C03485 0.667 156 C06342 0.778 6 C05901 0.617 227
C00396 0.593 250 C03486 0.683 125 C06343 0.597 246 C05902 0.678 134
C00399 0.494 317 C03526 0.673 144 C06344 0.464 326 C05903 0.444 333
C00834 0.592 254 C03527 0.676 137 C06345 0.612 230 C05904 0.721 73
C00840 0.630 212 C03528 0.541 290 C06346 0.569 269 C05905 0.651 182
C00848 0.742 41 C03529 0.444 332 C06347 0.717 85 C05906 0.640 194
C00858 0.693 111 C03530 0.694 110 C06348 0.692 113 C05907 0.632 205
C01606 0.592 255 C03593 0.619 225 C06349 0.567 272 C05908 0.659 171
C01607 0.604 239 C03594 0.681 129 C06350 0.690 115 C05909 0.665 157
C01609 0.671 147 C03595 0.667 154 C06351 0.630 213 C05910 0.577 263
C01610 0.692 114 C03596 0.677 136 C06352 0.596 247 C05911 0.608 233
C01611 0.594 249 C03597 0.603 240 C06353 0.619 224 C05912 0.628 218
C01623 0.651 183 C03598 0.625 220 C06200 0.650 184 C05913 0.491 318
C01627 0.655 177 C03599 0.766 16 C06201 0.571 268 C05914 0.647 186
C01630 0.528 299 C04081 0.514 307 C06202 0.728 59 C05915 0.610 231
C01633 0.601 242 C04082 0.641 193 C06203 0.755 27 C05916 0.662 166
C01635 0.764 17 C04083 0.490 319 C06204 0.660 170 C05917 0.736 52
C01651 0.718 80 C04084 0.735 55 C06205 0.653 178 C05918 0.679 133
C01657 0.668 153 C04085 0.652 180 C06206 0.173 346 C05919 0.635 203
C01660 0.605 238 C04086 0.703 100 C06208 0.529 298 C05920 0.657 174
C01740 0.517 303 C04125 0.829 1 C06209 0.670 150 C05921 0.652 181
C01741 0.628 215 C04126 0.540 292 C06210 0.587 258 C05922 0.763 18
C01742 0.692 112 C04127 0.637 198 C06211 0.468 324 C05923 0.661 168
C01751 0.624 221 C04558 0.750 33 C06212 0.674 143 C05924 0.516 305
C01752 0.770 9 C04559 0.710 95 C06213 0.717 87 C05925 0.674 139
C01753 0.628 216 C04560 0.680 132 C06214 0.599 244 C05926 0.600 243
C01754 0.599 245 C04561 0.741 42 C06215 0.503 312 C05927 0.674 142
C01755 0.706 98 C06281 0.624 222 C06216 0.687 117 C05928 0.660 169
C01815 0.606 237 C06282 0.593 252 C06217 0.552 282 C05929 0.377 341
C02056 0.694 109 C06283 0.641 192 C06218 0.670 148 C05930 0.341 342
C02058 0.575 265 C06284 0.727 61 C06219 0.501 315 C05931 0.731 57
C02071 0.746 37 C06285 0.669 152 C06220 0.561 278 C05932 0.552 280
C02072 0.686 118 C06286 0.736 53 C06221 0.426 338 C05933 0.532 296
C02073 0.663 163 C06287 0.656 176 C06222 0.637 200 C05934 0.718 79
C02077 0.212 345 C06288 0.736 51 C06223 0.731 58 C05935 0.292 344
C02078 0.628 217 C06289 0.431 337 C06224 0.641 191 C05937 0.630 214
C02081 0.632 209 C06290 0.756 24 C06225 0.507 310
C02103 0.717 84 C06291 0.579 262 C06226 0.531 297

Fig. 3

Cluster image based on D-value of 346 mungbean germplasms"

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