Crops ›› 2022, Vol. 38 ›› Issue (6): 174-180.doi: 10.16035/j.issn.1001-7283.2022.06.025

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Regulating Effects of Prohexadione-Calcium on the Growth of Mung Bean Seedlings under Saline-Alkali Stress

Hou Xue1(), Chen Yujie1(), Li Chunmiao1, Fang Shumei1,2(), Liang Xilong1,2(), Zheng Dianfeng1,3   

  1. 1Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang, China
    2Heilongjiang Plant Growth Regulator Engineering Technology Research Center, Daqing 163319, Heilongjiang, China
    3Guangdong Ocean University, Zhanjiang 524088, Guangdong, China
  • Received:2021-09-06 Revised:2021-11-19 Online:2022-12-15 Published:2022-12-21
  • Contact: Fang Shumei,Liang Xilong E-mail:1450674207@qq.com;1414554166@qq.com;fangshumei520@126.com;xilongliang@126.com

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Abstract:

Lüfeng 2 and Lüfeng 5 were used as the experiment materials. 150mmol/L mixed saline-alkali stress was applied and different concentrations of prohexadione-calcium (Pro-Ca) were foliar sprayed during the first compound leaf development period. Samples were collected after 15 days of continued growth to study the regulation effects of different concentrations of Pro-Ca on the growth of mung bean seedlings. The results showed that the suitable concentration of Pro-Ca (100mg/L) could maintain cell osmotic potential, eliminate reactive oxygen species, reduce the degree of membrane peroxidation, and protect cell membrane structure by increasing the content of osmotic substances, enhancing the activity of antioxidant enzymes, and reducing the content of MDA, thereby alleviating the damage to mung bean seedlings caused by salt-alkali stress, and improving the resistance of mung bean seedlings to salt-alkali. Specifically, the plant height of Lüfeng 2 and Lüfeng 5 decreased by 29.64% and 21.72%, the underground dry weight increased by 33.33% and 50.00%, and the root-to-shoot ratio increased by 42.86% and 8.33%, chlorophyll content increased by 15.77% and 18.55%, respectively, under the treatment of 100mg/L.

Key words: Saline-alkali stress, Prohexadione-calcium, Mung bean, Osmotic adjustment, Protective enzymes

Table 1

Effects of Pro-Ca on plant morphological indexes of mung bean seedlings under salt-alkali stress"

处理浓度
Treatment concentration (mg/L)		 品种
Variety		 株高
Plant height (cm)		 茎粗
Stem diameter (mm)		 地上部干重
Shoot dry weight (g)		 地下部干重
Root dry weight (g)		 根冠比
R/S
0 (CK) 绿丰2号 20.58±2.12a 1.43±0.19a 0.20±0.05a 0.03±0.01c 0.14±0.07b
绿丰5号 20.44±3.10a 1.43±0.19b 0.23±0.08a 0.04±0.02b 0.24±0.22a
50 绿丰2号 15.43±1.65bc 1.45±0.33a 0.24±0.10a 0.05±0.01ab 0.22±0.10a
绿丰5号 19.18±2.12a 1.55±0.24ab 0.25±0.10a 0.04±0.02b 0.17±0.08ab
100 绿丰2号 14.48±1.67c 1.43±0.26a 0.23±0.10a 0.04±0.02b 0.20±0.09ab
绿丰5号 16.00±1.49b 1.65±0.26a 0.28±0.08a 0.08±0.08a 0.26±0.17a
150 绿丰2号 13.82±2.64c 1.43±0.18a 0.24±0.09a 0.04±0.02bc 0.18±0.09ab
绿丰5号 18.77±3.17a 1.58±0.15ab 0.25±0.07a 0.03±0.01b 0.12±0.05b
200 绿丰2号 16.69±1.96b 1.38±0.18a 0.28±0.11a 0.05±0.01a 0.21±0.10a
绿丰5号 18.33±2.60a 1.48±0.24ab 0.29±0.14a 0.04±0.01b 0.17±0.09ab
F值F-value 处理 10.912** 0.892 1.629 4.480** 2.720*
品种 19.301** 5.314* 2.086 1.937 0.017
处理×品种 2.823* 0.539 0.191 4.058* 2.944*

Fig.1

Effects of Pro-Ca on SPAD of mung bean seedlings under salt-alkali stress The same letters indicate no significant difference with treatment (P > 0.05)"

Table 2

Effects of Pro-Ca on osmotic adjustment substances in mung bean seedlings under salt-alkali stress"

处理浓度
Treatment concentration (mg/L)		 品种
Variety		 可溶性糖含量
Soluble sugar content (m/g FW)		 可溶性蛋白质含量
Soluble protein content (m/g FW)		 脯氨酸含量
Proline content (μg/g FW)
0(CK) 绿丰2号 3.89±0.17a 4.44±0.02a 18.58±5.62a
绿丰5号 2.62±0.29a 4.18±0.17b 12.62±2.25a
50 绿丰2号 7.42±0.23bc 6.37±0.12a 21.94±1.92a
绿丰5号 4.49±0.20a 5.63±0.14ab 15.31±3.58a
100 绿丰2号 10.63±0.34c 4.63±0.19a 35.68±2.25a
绿丰5号 10.10±0.42b 6.43±0.12a 36.25±6.80a
150 绿丰2号 11.80±0.46c 4.94±0.09a 40.67±1.16a
绿丰5号 9.27±0.26a 4.93±0.05ab 36.25±1.73a
200 绿丰2号 9.62±0.28b 5.65±0.17a 21.94±3.66a
绿丰5号 9.09±0.10a 4.72±0.05ab 31.74±4.56a
F值F-value 处理 702.983** 156.345** 43.608**
品种 211.231** 0.346 2.836
处理×品种 21.760** 114.639** 2.501

Table 3

Effects of Pro-Ca on the SOD, POD and CAT activity of mung bean seedlings under salt-alkali stress"

处理浓度
Treatment concentration (mg/L)		 品种
Variety		 SOD活性
SOD activity (U/g FW)		 POD活性
POD activity (U/g FW)		 CAT活性
CAT activity (U/g FW)
0(CK) 绿丰2号 285.71±4.79a 1188.89±732.07a 311.11±27.76a
绿丰5号 310.08±18.43a 877.78±150.31b 404.44±20.37a
50 绿丰2号 323.81±15.74bc 2388.89±171.05a 337.78±40.73a
绿丰5号 330.90±19.17a 1788.89±69.39ab 524.44±7.70a
100 绿丰2号 334.00±2.03c 3644.44±509.18a 466.67±48.07a
绿丰5号 349.06±23.93b 2344.44±101.84a 546.67±0.00a
150 绿丰2号 319.82±21.48c 2433.33±200.00a 391.11±20.37a
绿丰5号 324.25±5.79a 2255.56±69.39ab 471.11±7.70a
200 绿丰2号 310.08±18.09b 1911.11±69.39a 315.56±7.70a
绿丰5号 318.05±2.77a 1988.89±830.22ab 317.78±27.76a
F值F-value 处理 6.566** 18.911** 33.286**
品种 4.367 10.008** 135.309**
处理×品种 0.408 2.614 4.605**

Table 4

Effects of Pro-Ca on MDA content (mmol/g FW) of mung bean seedlings under salt-alkali stress"

处理浓度
Treatment
concentration (mg/L)		 品种
Variety		 MDA含量
MDA content
(mmol/g FW)
0 (CK) 绿丰2号 33.99±0.84a
绿丰5号 23.66±0.67a
50 绿丰2号 28.52±7.57bc
绿丰5号 22.21±0.28a
100 绿丰2号 26.20±0.51c
绿丰5号 20.99±1.38b
150 绿丰2号 26.02±0.44c
绿丰5号 22.00±2.20a
200 绿丰2号 21.73±0.55b
绿丰5号 19.61±0.60a
F值F-value 处理 7.953**
品种 35.401**
处理×品种 2.124
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