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Acta Agronomica Sinica ›› 2023, Vol. 49 ›› Issue (4): 926-937.doi: 10.3724/SP.J.1006.2023.24080

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

Genotypes screening and comprehensive evaluation of sweetpotato tolerant to low potassium stress at seedling stage

LIU Ming1,2(), FAN Wen-Jing1,3, ZHAO Peng1, JIN Rong1, ZHANG Qiang-Qiang1, ZHU Xiao-Ya1, WANG Jing1, LI Qiang1,2,*()   

  1. 1Xuzhou Institute of Agricultural Sciences in Jiangsu Xuhuai District/Key Laboratory of Sweetpotato Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, Xuzhou 221131, Jiangsu, China
    2Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
    3College of Agronomy, Anhui Agricultural University, Hefei 230036, Anhui, China
  • Received:2022-04-02 Accepted:2022-07-21 Online:2023-04-12 Published:2022-08-18
  • Contact: *E-mail: instrong@163.com
  • Supported by:
    China Agriculture Research System of MOF and MARA(CARS-10);National Key Research and Development Program of China(2018YFD1000704);Key Research and Development Program of Jiangsu Province(BE2021311)

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Abstract:

The purpose of this study was to establish a low potassium (K) tolerant evaluation system for sweetpotato at seedling stage and to screen sweetpotato materials with low-K-tolerant and low-K-sensitive. 214 sweetpotato varieties (lines) from domestic and abroad were cultured under low-K-stress (0 mmol L-1 K2O, LK) and normal K treatment (10 mmol L-1 K2O, CK) through a hydroponic experiment. 11 traits, such as biomass, K accumulation, K content, and K utilization efficiency were collected to calculate the low-K-stress tolerance index of each index. The low-K-tolerant ability of each sweetpotato material was comprehensively evaluated by principal component analysis (PCA), regression analysis, and cluster analysis. The results showed that the biomass and K uptake and utilization characteristics of different sweetpotato materials were different under two K levels. Under LK treatment, shoot biomass (SB), shoot biomass increase (SBI), root biomass increase (RBI), total biomass increase (PBI), K accumulation in shoot (KAS), K accumulation in root (KAR), K accumulation in plant (KAP), K concentration in shoot (KCS), and K concentration in root (KCR) decreased by more than 29% compared with CK, while root shoot ratio (RSR) and K physiological utilization efficiency (KUE) increased by 29.63% and 120.56%, respectively. Under LK treatment, the variation coefficients of SB, SBI, PBI, KAS, KAP, KCS, KCR, and KUE of different sweetpotato materials were higher than those of CK treatment. Principal component analysis was carried out on the low-K-stress tolerant index of 11 indexes. Three principal components (PC) were selected and the cumulative variance contribution rate was 82.86%. The low-K-tolerant index of 11 indicators was significantly correlated with the comprehensive evaluation value (Y) of low-K-tolerant. Selected SBI, RBI, PBI, KAS, KAR, KAP as screening evaluation indicators, 214 sweetpotato materials were divided into low-K-tolerant type, intermediate type and low-K-sensitive type according to cluster heat map analysis. The variance analysis showed that the low-K-tolerant varieties had higher low-K-stress tolerance index than other types of varieties, and the Y-value was also in the top, which verified the accuracy of the clustering results. Based on the results of this study, SBI, RBI, PBI, KAS, KAR, and KAP can be used as the first selection indexes for the screening of sweetpotato with different low-K-tolerance ability at seedling stage. Six genotypes with the strongest tolerance to low K at seedling stage were selected, which were Jizishu 18, Guangzishu 2, Longshu 710, Taizhong 6, Shenglibaihao, and Longshu 9.

Key words: sweetpotato, low-K-tolerant, variety screening, evaluation indicators

Table 1

Sweetpotato materials for test"

编号
Number		 品种名称
Variety name		 编号
Number		 品种名称
Variety name
1 渝薯99 Yushu 99 108 宁紫薯1号 Ningzishu 1
2 渝红心薯8号 Yuhongxinshu 8 109 徐紫薯2号 Xuzishu 2
3 浙薯147 Zheshu 147 110 徐紫薯8号 Xuzishu 8
4 渝苏162 Yusu 162 111 徐紫薯6号 Xuzishu 6
5 浙薯6025 Zheshu 6025 112 绵紫薯9号 Mianzishu 9
6 渝苏153 Yushu 153 113 绵渝紫11 Mianyuzi 11
7 普薯32 Pushu 32 114 万紫薯56 Wanzishu 56
8 渝薯17 Yushu 17 115 鄂紫薯13 Ezishu 13
9 1399-2 116 鄂薯12 Eshu 12
10 S1-5 117 桂紫薯3号 Guizishu 3
11 福薯13 Fushu 13 118 福薯24号 Fushu 24
12 渝紫3号 Yuzi 3 119 川紫薯2号 Chuanzishu 2
13 江津乌苕尖 Jiangjinwutiaojian 120 桂经薯9号 Guijingshu 9
14 南薯007 Nanshu 007 121 商徐紫1号 Shangxuzi 1
15 渝薯2号 Yushu 2 122 吉徐紫2号 Jixuzi 2
16 龙薯9号 Longshu 9 123 徐紫薯3号 Xuzishu 3
17 济薯18 Jishu 18 124 渝紫7号 Yuzi 7
18 南薯012 Nanshu 012 125 彭紫薯3号 Pengzishu 3
19 苏薯1号 Sushu 1 126 渝紫263 Yuzi 263
20 二南苕/胜南苕 Ernantiao/Shengnanshao 127 徐紫薯5号 Xuzishu 5
21 济78268 Ji 78268 128 桂经薯6号 Guijingshu 6
22 徐22-5 Xu 22-5 129 桂经薯8号 Guijingshu 8
23 南薯15 Nanshu 15 130 南紫014 Nanzi 014
24 渝紫6号 Yuzi 6 131 南紫015 Nanzi 015
25 心香 Xinxiang 132 黔紫薯1号 Qianzishu 1
26 早秋 Zaoqiu 133 福宁紫3号 Funingzi 3
27 浙紫薯2号 Zhezishu 2 134 福宁紫4号 Funingzi 4
28 龙薯1号 Longshu 1 135 莆紫薯3号 Puzishu 3
29 徐17-10 Xu 17-10 136 莆紫薯18号 Puzishu 18
30 渝薯12 Yushu 12 137 济紫薯3号 Jizishu 3
31 南薯88 Nanshu 88 138 广紫薯9号 Guangzishu 9
32 1498-4 139 广紫薯10号 Guangzishu 10
33 浙薯81 Zheshu 81 140 广紫薯11号 Guangzishu 11
编号
Number		 品种名称
Variety name		 编号
Number		 品种名称
Variety name
34 1375-11 141 广紫薯1号 Guangzishu 1
35 渝薯33 Yushu 33 142 广紫薯2号 Guangzishu 2
36 渝薯6号 Yushu 6 143 广紫薯8号 Guangzishu 8
37 商丘52-7 Shangqiu 52-7 144 济紫薯18号 Jizishu 18
38 浙菜薯726 Zhecaishu 726 145 绫紫 Lingzi
39 13104-2 146 泰紫1506 Taizi 1506
40 浙薯13 Zheshu 13 147 泰紫2014-04 Taizi 2014-04
41 万薯10号 Wanshu 10 148 韩紫 Hanzi
42 红香蕉 Hongxiangjiao 149 徐紫秧10号 Xuziyang 10
43 济薯29 Jishu 29 150 龙薯4号 Longshu 4
44 岩薯5号 Yanshu 5 151 防紫9号 Fangzi 9
45 浙255 Zhe 255 152 防薯9号 Fangshu 9
46 济10216 Ji 10216 153 广薯98 Guangshu 98
47 济农51 Jinong 51 154 广薯146 Guangshu 146
48 济农290 Jinong 290 155 广薯72 Guangshu 72
49 冀紫薯2号 Jizishu 2 156 金山17 Jinshan 17
50 南紫020 Nanzi 020 157 金山20 Jinshan 20
51 南紫018 Nanzi 018 158 金山57 Jinshan 57
52 川薯228 Chuanshu 228 159 秦薯8号 Qinshu 8
53 川薯294 Chuanshu 294 160 栗子香 Lizixiang
54 龙薯15 Longshu 15 161 烟薯25 Yanshu 25
55 龙薯601 Longshu 601 162 烟薯26 Yanshu 26
56 郑薯20 Zhengshu 20 163 烟台红 Yantaihong
57 泰中6号 Taizhong 6 164 福建连城 Fujianliancheng
58 鲁薯8号 Lushu 8 165 柬埔寨1号 Jianpuzhai 1
59 泰薯12号 Taishu 12 166 临高(半紫) Lingao (banzi)
60 万薯7号 Wanshu 7 167 日本黑 Ribenhei
61 泰薯14号 Taishu 14 168 赤几紫 Chijizi
62 徐薯32 Xushu 32 169 川薯20 Chuanshu 20
63 徐薯33 Xushu 33 170 福宁紫1号 Funingzi 1
64 徐渝薯34 Xuyushu 34 171 阜紫1号 Fuzi 1
65 徐渝薯35 Xuyushu 35 172 黄吉2号 Huangji 2
66 苏薯8号 Sushu 8 173 济黑 Jihei
67 安平1号 Anping 1 174 龙紫9号 Longzi 9
68 冰淇淋 Bingqilin 175 汝城小紫 Ruchengxiaozi
69 济薯26 Jishu 26 176 广薯87 Guangshu 87
70 岩薯5号 Yanshu 5 177 长塘黄 Changtanghuang
71 红优 Hongyou 178 黄吉1号 Huangji 1
72 胜利百号 Shenglibaihao 179 小桂紫微薯 Xiaoguiziweishu
73 苏薯22 Sushu 22 180 安哥拉1 Angela 1
74 苏薯25 Sushu 25 181 川薯1号 Chuanshu 1
75 川薯20 Chuanshu 20 182 鄂薯3号 Eshu 3
76 鄂薯11 E’shu 11 183 福317 Fu 317
77 赣渝3号 Ganyu 3 184 福薯26 Fushu 26
78 豫21-16 Yu 21-16 185 刚果布2号 Gangguobu 2
编号
Number		 品种名称
Variety name		 编号
Number		 品种名称
Variety name
79 万9902-7 Wan 9902-7 186 广薯155 Guangshu 155
80 川薯220 Chuanshu 220 187 桂粉3号 Guifen 3
81 黔薯5号 Qianshu 5 188 红尾薯 Hongweishu
82 丹研红心薯Danyanhongxinshu 189 黄皮薯 Huangpishu
83 渝92-113-90 Yu 92-113-90 190 鸡蛋黄 Jidanhuang
84 渝5-2-48 Yu 5-2-48 191 冀薯98 Jishu 98
85 二郎苕 Erlangshao 192 九里香 Jiulixiang
86 绵9-6-3 Mian 9-6-3 193 六拾日 Liushiri
87 鲁薯18 Lushu 18 194 龙薯710 Longshu 710
88 宁4-6 Ning 4-6 195 秘鲁 Bilu
89 香苕 Xiangtiao 196 南充香种 Nanchongxiangzhong
90 南薯010 Nanshu 010 197 农岩7-3 Nongyan 7-3
91 福薯604 Fushu 604 198 青岛乐泉 Qingdaolequan
92 冀薯4 Jishu 4 199 泉薯10号 Quanshu 10
93 冀薯332 Jishu 332 200 泉薯830 Quanshu 830
94 湛薯12 Zhanshu 12 201 三明P355058 Sanming P35508
95 川1-60 Chuan 1-60 202 台农57 Tainong 57
96 龙紫薯6号 Longzishu 6 203 泰国 Taiguo
97 浙紫薯1号 Zhezishu 1 204 禺百红 Yubaihong
98 宁紫薯3号 Ningzishu 3 205 豫薯13 Yushu 13
99 济紫黑2号 Jizihei 2 206 湛薯16 Zhanshu 16
100 阜紫薯1号 Fuzishu 1 207 湛江橙 Zhanjiangcheng
101 泰中11号 Taizhong 11 208 湛薯118 Zhanshu 118
102 烟紫薯3号 Yanzishu 3 209 JY2 (日本红心品种) JY2 (Ribenhongxinpinzhong)
103 皖YW-36-1 Wan YW-36-1 210 浙紫5号 Zhezi 5
104 龙津薯3号 Longjinshu 3 211 大南伏 Dananfu
105 湛紫薯2号 Zhanzishu 2 212 浙薯70 Zheshu 70
106 烟紫薯2号 Yanzishu 2 213 宁紫6号 Ningzi 6
107 宁紫薯4号 Ningzishu 4 214 宜宾红心薯 Yibinhongxinshu

Table 2

Variation analysis of various characters of sweetpotato seedlings in different potassium levels"

指标
Index		 正常钾处理 Normal K treatment (CK) 低钾处理Low-K-stress treatment (LK)
变幅
Range		 均值
Mean		 变异系数
CV (%)		 变幅
Range		 均值
Mean		 变异系数
CV (%)
地上部干重Shoot biomass (g plant-1) 0.53-4.43 2.05 37.24 0.22-2.74 1.16 38.39
地上部干物质增加量Shoot biomass increase (g plant-1) 0.16-3.46 1.32 48.47 -0.87-1.36 0.16 246.61
根系干物质增加量Root biomass increase (g plant-1) 0.10-1.57 0.55 49.05 0.07-0.91 0.39 39.16
总干物质增加量Plant biomass increase (g plant-1) 0.33-4.85 1.87 45.78 -0.52-2.01 0.55 85.31
根冠比Root-shoot ratio 0.08-0.63 0.27 33.04 0.09-0.76 0.35 29.68
地上部钾积累量K accumulation in shoot (g plant-1) 0.09-1.22 0.46 49.49 0.01-0.23 0.05 64.63
根系钾积累量K accumulation in root (g plant-1) 0.02-0.70 0.22 58.05 0.00-0.08 0.02 52.97
总钾积累量K accumulation in plant (g plant-1) 0.14-1.83 0.67 48.60 0.02-0.23 0.08 53.92
地上部钾含量K concentration in shoot (%) 8.86-117.01 22.05 37.16 1.74-18.41 4.81 61.19
根系钾含量K concentration in root (%) 14.30-54.71 38.20 19.53 2.00-15.03 6.71 42.47
钾生理利用效率K physiological utilization efficiency (%) 0.55-5.51 2.87 22.35 -16.67-21.93 6.33 92.35

Table 3

Weighted coefficients, eigenvalues, variance contribution, and cumulative variance contribution of first three principal components based on 11 index"

指标
Index		 主成分 Principal components
成分1 Factor 1 成分2 Factor 2 成分3 Factor 3
地上部干重 Shoot biomass 0.668 0.400 -0.230
地上部干物质增加量 Shoot biomass increase 0.769 -0.023 -0.494
根系干物质增加量 Root biomass increase 0.546 0.730 0.319
总干物质增加量 Plant biomass increase 0.893 0.245 -0.290
根冠比 Root-shoot ratio 0.059 0.549 0.682
地上部钾积累量 K accumulation in shoot 0.821 -0.456 -0.022
根系钾积累量 K accumulation in root 0.734 0.279 0.546
总钾积累量 K accumulation in plant 0.908 -0.289 0.176
地上部钾含量 K concentration in shoot 0.532 -0.743 0.112
根系钾含量 K concentration in root 0.489 -0.506 0.433
钾生理利用效率 K physiological utilization efficiency 0.396 0.445 -0.597
特征值 Eigenvalues 4.851 2.429 1.834
方差的贡献率 Variance contribution (%) 44.100 22.081 16.677
累积贡献率 Cumulative variance contribution (%) 44.100 66.181 82.858

Table 4

Correlation coefficient between 11 indexes of low-K-tolerance and the comprehensive value (Y)"

指标
Trait		 相关系数
Correlation coefficient		 P值
P-value
地上部干重 Shoot biomass 0.696** 0.000
地上部干物质增加量 Shoot biomass increase 0.594** 0.000
根系干物质增加量 Root biomass increase 0.809** 0.000
总干物质增加量 Plant biomass increase 0.840** 0.000
根冠比 Root-shoot ratio 0.379** 0.000
地上部钾积累量 K accumulation in shoot 0.603** 0.000
根系钾积累量 K accumulation in root 0.883** 0.000
总钾积累量 K accumulation in plant 0.779** 0.000
地上部钾含量 K concentration in shoot 0.271** 0.000
根系钾含量 K concentration in root 0.378** 0.000
钾生理利用效率 K physiological utilization efficiency 0.382** 0.000

Fig. 1

Dendrogram of different sweetpotato genotypes based on low-K-tolerance SBI: shoot biomass increase; RBI: root biomass increase; PBI: plant biomass increase; KAS: K accumulation in shoot; KAR: K accumulation in root; KAP: K accumulation in plant."

Fig. 2

Comprehensive evaluation of agronomic traits of different sweetpotato with low-K-tolerance SB: shoot biomass; RSR: root-shoot ratio; KCS: K concentration in shoot; KCR: K concentration in root; KUE: K physiological utilization efficiency; SBI: shoot biomass increase; RBI: root biomass increase; PBI: plant biomass increase; KAS: K accumulation in shoot; KAR: K accumulation in root; KAP: K accumulation in plant."

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