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Acta Agronomica Sinica ›› 2021, Vol. 47 ›› Issue (10): 1988-2000.doi: 10.3724/SP.J.1006.2021.04233

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of uniconazole on physiological characteristics and microstructure under waterlogging stress at seedling stage in soybean

WANG Shi-Ya1,2(), ZHENG Dian-Feng1,4,*(), FENG Nai-Jie1,4,*(), LIANG Xi-Long2,3, XIANG Hong-Tao5, FENG Sheng-Jie1, JIN Dan2, LIU Mei-Ling2, MU Bao-Min2   

  1. 1College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, Guangdong, China
    2College of Agriculture, Heilongjiang Bayi Agriculture University, Daqing 163319, Heilongjiang, China
    3Plant Growth Regulator Engineering Research Center, Heilongjiang Bayi Agriculture University, Daqing 163319, Heilongjiang, China
    4Shenzhen Research Institute, Guangdong Ocean University, Shenzhen 518108, Guangdong, China
    5Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, Heilongjiang, China
  • Received:2020-10-28 Accepted:2021-01-13 Online:2021-10-12 Published:2021-02-20
  • Contact: ZHENG Dian-Feng,FENG Nai-Jie E-mail:wsy1106ok@126.com;zdffnj@163.com;byndfnj@126.com
  • Supported by:
    National Natural Science Foundation of China(31871576);National Key Research and Development Program of China(2019YFD1002205);Key Project of Natural Science Foundation of Heilongjiang(ZD2017003);Graduate Innovation Research Projects of Heilongjiang Bayi Agriculture University(YJSCX2019-Y96)

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Abstract:

To explore the effects of waterlogging stress on the physiological characteristics and microstructure of soybean and the mitigation effect of S3307, the physiological characteristics of soybean leaves and roots, the microstructure of hypocotyls and the regulation effect of S3307 were investigated using Kenfeng 14 as the experimental material with S3307 sprayed on the leaves of soybean at V1 stage and five days after waterlogging stress in a pot experiment. The results showed that waterlogging stress increased the number of ventilated tissues in soybean hypocotyl, and the area of ventilated tissues increased gradually with the prolongation of waterlogging stress. S3307 could improve soybean adaptability to waterlogging adversity, increase the number of ventilated tissue and cope with the hypoxia stress by waterlogging stress on plants. Compared with CK, waterlogging stress increased the accumulation of ROS and membrane lipid peroxidation in leaves and roots, and gradually increased with the prolongation of stress time. Meanwhile, the activity of enzymatic antioxidant defense system was enhanced at early stage under waterlogging stress, resulting in an increase in the content of osmotic regulatory substances, which decreased with the prolongation of stress time. S3307 can promote the activity of antioxidant enzyme in leaves and roots, inhibit the excessive accumulation of ROS and MDA content, maintain a high content of osmotic regulation substances, and alleviate the damage caused by waterlogging stress. In summary, there were differences in response to different organs under waterlogging stress. S3307 can alleviate the damage to soybean plants caused by waterlogging stress to a certain extent.

Key words: waterlogging stress, soybean, uniconazole (S3307), physiological characteristics, microstructure

Table 1

Experiment design"

处理编号
Treatment code		 药剂处理
Pharmaceutical treatment		 水分处理
Water treatment
CK 清水喷施 Spray water 适宜土壤水分 Suitable soil moisture
W 清水喷施 Spray water 淹水胁迫 Waterlogging stress
S S3307喷施 Spray S3307 淹水胁迫 Waterlogging stress

Table 2

Effects of S3307 on aboveground morphological traits under waterlogging stress at V1 stage in soybean"

指标
Trait		 处理
Treatment		 淹水天数 Waterlogging days
0 d 1 d 3 d 5 d 7 d
株高
Plant height (cm)		 CK 16.32±0.502 a 16.81±0.336 a 20.09±0.360 a 21.31±0.523 a 21.82±0.666 a
W 15.96±0.471 a 16.81±0.756 a 16.91±0.724 b 17.13±0.535 b 17.25±0.544 b
S 12.87±0.694 b 13.22±0.305 b 13.53±0.510 c 13.80±0.317 c 14.05±0.464 c
茎粗
Stem diameter (mm)		 CK 2.82±0.078 b 2.86±0.067 b 2.86±0.015 b 2.87±0.031 c 2.94±0.050 b
W 2.84±0.075 b 2.90±0.036 b 2.98±0.042 a 3.02±0.020 b 3.08±0.015 a
S 2.98±0.030 a 3.00±0.038 a 3.04±0.040 a 3.09±0.015 a 3.11±0.025 a
叶面积
Leaf areas (mm2)		 CK 3598.50±239.881 a 3689.56±199.213 a 3576.06±208.030 a 3837.35±67.895 a 3956.45±55.776 a
W 3289.21±143.851 ab 3384.60±141.800 ab 3542.72±81.976 a 3505.03±45.032 b 3519.19±33.713 b
S 3129.26±173.781 b 3239.22±108.931 b 3188.17±68.382 b 3232.09±111.343 c 3326.58±87.010 c

Fig. 1

Effects of S3307 on aerenchyma number and area in leaves and roots under waterlogging stress at V1 stage in soybean Treatments are the same as those given in Table 1."

Fig. 2

Effects of S3307 on microstructure of hypocotyl under waterlogging stress at V1 stage in soybean 1 and 2 show W treatment for 0 day of waterlogging treatment; 3 and 4 show S treatment for 0 day of waterlogging treatment; 5 and 6 show W treatment for 1 day of waterlogging treatment; 7 and 8 show S treatment for 1 day of waterlogging treatment; 9, 10 and 11 show W treatment for 3 days of waterlogging treatment; 12, 13, and 14 show S treatment for 3 days of waterlogging treatment; 15, 16, and 17 show W treatment for 5 days of waterlogging treatment; 18, 19, and 20 show S treatment for 5 days of waterlogging treatment; 21, 22, and 23 show W treatment for 7 days of waterlogging treatment; 24, 25, and 26 show S treatment for 7 days of waterlogging treatment. Treatments are the same as those given in Table 1."

Fig. 3

Effects of S3307 on MDA content of leaves and roots under waterlogging stress at V1 stage in soybean Treatments are the same as those given in Table 1. Different lowercase letters in the same day mean significantly different among different treatments at the 0.05 probability level."

Fig. 4

Effects of S3307 on O2- production rate and H2O2 content of leaves and roots under waterlogging stress at V1 stage in soybean Treatments are the same as those given in Table 1. Different lowercase letters in the same day mean significantly different among different treatments at the 0.05 probability level."

Fig. 5

Effects of S3307 on enzymatic antioxidant system of leaves and roots under waterlogging stress at V1 stage in soybean Treatments are the same as those given in Table 1. Different lowercase letters in the same day mean significantly different among different treatments at the 0.05 probability level."

Fig. 6

Effects of S3307 on osmotic regulating substance of leaves and roots under waterlogging stress at V1 stage in soybean Treatments are the same as those given in Table 1. Different lowercase letters in the same day mean significantly different among different treatments at the 0.05 probability level."

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