Crops ›› 2024, Vol. 40 ›› Issue (6): 132-139.doi: 10.16035/j.issn.1001-7283.2024.06.018

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Effects of Applying Diquat-Dibromide on Potato Quality under Different Watering Treatments

Pang Minxuan(), Wang Han, Li Zhitao, Shi Ningfan, Pu Zhuanfang, Zhang Feng, Yao Panfeng, Bi Zhenzhen, Bai Jiangping, Sun Chao()   

  1. College of Agronomy, Gansu Agricultural University / State Key Laboratory of Aridland Crop Science / Gansu Key Laboratory of Crop Improvement & Germplasm Enhancement, Lanzhou 730070, Gansu, China
  • Received:2024-01-24 Revised:2024-06-20 Online:2024-12-15 Published:2024-12-05

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Abstract:

In order to investigate the effect of applying Diquat-dibromide on potato quality under normal watering and drought stress, three potato varieties with different drought resistances were selected and pot water control method was used for drought stress. Drought stress treatment was applied 50 d after planting, and Diquat-dibromide was applied 10 d before harvest. Tuber yield, nutrient quality, skin thickness and tuber hardness were measured at 0, 30 and 60 d after storage at 25 ℃. The results showed that the yield of Longshu 6 was significantly increased after Diquat-dibromide treatment under normal watering, while the yield of other varieties did not change significantly. However, applying Diquat-dibromide significantly increased the tuber hardness and skin thickness of different potato varieties, which could play an important role in reducing the physical damage of tubers caused by mechanical harvest, transportation and storage of potatoes. Principal component analysis and membership function method were used for comprehensive evaluation of the measured indexes, three principal components played the main role, with a cumulative contribution rate of 85.544%. The contribution of tuber hardness, protein and calcium was the largest. Drought-tolerant intermediate type Longshu 6 had the highest comprehensive evaluation, while-drought sensitive variety Atlantic was the lowest, indicating that applying Diquat-dibromide had the greatest impact on the quality of Longshu 6.

Key words: Potato tuber, Drought stress, Diquat-dibromide, Principal component analysis, Membership function method

Table 1

The test materials and their drought-tolerance"

品种Variety 耐旱性Drought-tolerance
大西洋Atlantic (Atl) 敏感型[14,18]
陇薯6号Longshu 6 (L6) 中间型[19]
青薯9号Qingshu 9 (QS9) 耐旱型[20]

Fig.1

Yield changes under normal watering and drought stress applying Diquat-dibromide Different lowercase letters indicate significant differences between treatments for the same potato variety (P < 0. 05), the same below."

Table 2

Effects of applying Diquat-dibromide on nutritional quality of potato tuber under different watering conditions"

处理
Treatment		 指标
Index		 Atl QS9 L6
0 d 30 d 60 d 0 d 30 d 60 d 0 d 30 d 60 d
正常浇水
Normal
watering		 PT 1.18±0.01a 0.89±0.01c 1.01±0.02b 0.96±0.02a 1.02±0.09a 1.02±0.01a 0.99±0.01b 1.00±0.01b 1.13±0.01a
ST 1.05±0.01a 1.03±0.02ab 1.00±0.01b 1.02±0.02a 0.88±0.02b 0.98±0.03a 1.07±0.01a 1.05±0.00a 1.06±0.00a
Ca 0.91±0.07b 1.29±0.02a 0.84±0.03b 0.85±0.07b 1.20±0.05a 0.53±0.04c 0.40±0.06b 0.71±0.02a 0.78±0.01a
DF 1.04±0.06a 0.89±0.02b 1.00±0.04ab 1.00±0.04a 0.91±0.01a 0.97±0.04a 0.72±0.02c 0.96±0.02b 1.07±0.03a
Fe 0.86±0.01a 0.82±0.01a 1.00±0.02b 0.97±0.02b 1.28±0.04a 1.02±0.03b 0.80±0.01c 1.16±0.00a 1.00±0.01b
Mg 1.01±0.02b 1.08±0.01a 1.00±0.01b 0.99±0.01ab 1.06±0.03a 0.97±0.02b 1.10±0.01a 1.06±0.01a 1.00±0.01b
RS 0.55±0.04b 0.96±0.09a 1.00±0.11a 0.98±0.11a 0.82±0.12a 1.00±0.02a 1.07±0.06a 0.68±0.03b 0.80±0.02b
Vc 0.81±0.04c 1.11±0.00a 1.00±0.01b 0.94±0.00b 1.00±0.02a 0.71±0.02c 0.87±0.01b 0.87±0.01b 0.99±0.00a
干旱胁迫
Drought
stress		 PT 1.14±0.02a 1.03±0.00b 1.02±0.02b 0.99±0.00ab 0.95±0.02b 1.02±0.01a 0.94±0.00c 1.01±0.01a 0.97±0.01b
ST 1.01±0.03a 0.96±0.00a 1.00±0.00a 0.97±0.01a 1.00±0.02a 0.94±0.00a 1.05±0.00b 1.06±0.00b 1.10±0.01a
Ca 0.79±0.02b 1.01±0.03a 0.74±0.01b 1.23±0.08b 1.61±0.05a 0.74±0.03c 0.75±0.02b 0.33±0.06c 0.99±0.02a
DF 0.85±0.06a 0.89±0.02a 0.98±0.02a 1.07±0.04a 0.98±0.02ab 0.94±0.02b 0.83±0.02b 0.93±0.04b 1.13±0.03a
Fe 0.86±0.01a 0.82±0.01a 1.00±0.02b 0.97±0.02b 1.28±0.04a 1.02±0.03b 0.80±0.01c 1.16±0.00a 1.00±0.01b
Mg 1.03±0.02b 0.94±0.03a 1.00±0.01b 0.96±0.02ab 0.92±0.01a 1.07±0.01b 1.06±0.02a 1.07±0.02a 1.09±0.01b
RS 0.96±0.05b 1.22±0.06a 1.31±0.09a 1.27±0.04b 1.42±0.03a 0.99±0.02c 1.29±0.08b 0.71±0.04c 1.76±0.05a
Vc 0.78±0.04b 1.01±0.03a 0.86±0.05b 1.07±0.04b 1.42±0.03a 1.12±0.02b 1.00±0.02a 0.79±0.03b 1.01±0.00a

Fig.2

Effects of Diquat-dibromide on skin thickness and tuber hardness of potato under two watering conditions"

Table 3

Correlation of potato quality indexes under drought stress"

品质指标Quality index TH PT ST Ca DF Fe Mg RS Vc PST
TH 1.000
PT -0.262 1.000
ST 0.837** 0.033 1.000
Ca 0.164 -0.077 -0.130 1.000
DF -0.511 -0.575 -0.565 0.134 1.000
Fe -0.076 -0.467 -0.503 0.598 0.542 1.000
Mg 0.283 -0.279 0.423 -0.751* -0.024 -0.387 1.000
RS -0.631 0.155 -0.422 -0.445 0.229 -0.336 0.207 1.000
Vc 0.206 -0.470 -0.147 0.806* 0.436 0.817* -0.402 -0.313 1.000
PST -0.318 0.802* -0.171 -0.286 -0.512 -0.378 -0.002 0.504 -0.460 1.000

Table 4

Standardization value of quality indexes of three potato varieties"

品种Variety 贮藏天数Storage days (d) TH PT ST Ca DF Fe Mg RS Vc PST
Atl 0 -0.360 2.200 -0.010 -0.342 -1.072 -1.273 0.183 0.030 -1.446 1.915
30 -0.312 0.449 -0.959 0.277 -0.647 0.895 -1.230 -0.853 -0.163 0.377
60 -0.831 0.156 -0.128 -0.470 0.274 -1.259 -0.236 0.311 -0.989 -0.549
QS9 0 -0.122 -0.325 -0.855 0.893 -0.178 -0.045 -0.804 0.201 0.186 0.130
30 0.261 0.245 -0.252 1.931 0.233 1.348 -1.531 -0.739 2.140 -0.324
60 -1.062 -1.017 -1.299 -0.471 1.186 1.080 0.854 0.689 0.421 0.055
L6 0 1.353 0.099 0.818 -0.436 -1.274 -0.988 0.744 0.241 -0.218 0.816
30 1.853 -1.150 0.952 0.229 -0.298 0.164 0.808 -1.679 0.215 -1.503
60 -0.778 -0.652 1.734 -1.612 1.775 0.078 1.213 1.799 -0.146 -0.916

Table 5

Principal component analysis of potato quality evaluation"

主成分
Principal component		 初始特征值Initial eigenvalue 载荷的平方和Extract the sum of squared loads
总和Total 百分比Percent 累计Accumulate (%) 总和Total 百分比Percent 累计Accumulate (%)
1 3.437 34.370 34.370 3.437 34.370 34.370
2 3.069 30.685 65.055 3.069 30.685 65.055
3 2.049 20.489 85.544 2.049 20.489 85.544

Table 6

Load matrix of potato quality indicators"

指数
Index		 主成分Principal component
1 2 3
Ca 0.945 -0.177 0.003
Mg -0.763 0.346 0.346
Vc 0.759 0.506 -0.014
RS -0.719 0.274 -0.490
Fe 0.672 0.552 -0.275
PT -0.097 -0.881 -0.216
DF -0.210 0.858 -0.419
PST -0.150 -0.833 -0.318
TH 0.297 -0.095 0.930
ST -0.503 0.255 0.652

Table 7

Membership function values for quality evaluation of three potato varieties"

品种Variety 贮藏天数Storage days (d) CI(1) CI(2) CI(3) μ(X1) μ(X2) μ(X3) D-value 排名Ranking
Atl 0 -0.819 -1.864 -0.273 0.200 0.000 0.285 0.149 9
30 0.790 -0.579 -0.543 0.689 0.384 0.203 0.463 4
60 -0.657 -0.165 -0.345 0.249 0.508 0.263 0.345 7
QS9 0 0.543 -0.161 -0.455 0.614 0.509 0.229 0.149 8
30 1.814 0.299 -0.260 1.000 0.647 0.289 0.703 2
60 -0.107 0.982 -1.208 0.416 0.851 0.000 0.472 3
L6 0 -0.540 -0.663 1.199 0.285 0.359 0.733 0.419 6
30 0.452 0.670 2.074 0.586 0.757 1.000 0.747 1
60 -1.477 1.481 -0.190 0.000 1.000 0.310 0.433 5
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