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Acta Agronomica Sinica ›› 2019, Vol. 45 ›› Issue (12): 1851-1858.doi: 10.3724/SP.J.1006.2019.94035

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

Regulatory effects of coronatine on photosynthetic characteristics and yield of soybean under different irrigation conditions

Hai-Yue YU,Yan YAN,Yu-Shi ZHANG,Ming-Cai ZHANG(),Zhao-Hu LI   

  1. Engineering Research Center of Plant Growth Regulator, Ministry of Education / College of Agronomy and Biotechnology, China Agricultural University, Beijing 100093, China
  • Received:2019-03-05 Accepted:2019-06-12 Online:2019-12-12 Published:2019-07-08
  • Contact: Ming-Cai ZHANG E-mail:zmc1214@163.com
  • Supported by:
    This study was supported by the National Natural Science Foundation of China(31471420)

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Abstract:

Drought is one of the important factors limiting the high and stable yield of soybean, and an important problem restricting the sustainable production of soybean in China. Using biological regulators to improve the drought tolerance of soybean in production is a new feasible biological water-saving mode. In this study, the field experiments were conducted to investigate the effects of coronatine (COR) on leaf water potential, photosynthetic characteristics, plant traits, yield and its components of soybean under conventional irrigation and no irrigation conditions from 2015 to 2016. Under conventional irrigation conditions, COR could not change the values of leaf water potential, chlorophyll content, photosynthetic rate, chlorophyll fluorescence parameters, and activities of RuBP carboxylase and SPS in soybean leaves compared to control. And there was no significant difference in yield and biomass between COR treatment and control. However, under no irrigation conditions, COR significantly increased the leaf water potential, chlorophyll content, photosynthetic rate and chlorophyll fluorescence parameters, as well as the activities of RuBP carboxylase and SPS of soybean leaves, thus improved the yield and yield components. These results suggest that COR has a positive regulatory effect on photosynthetic characteristics and yield formation of soybean under no irrigation conditions, and can be used as a new technical means for cultivation preventing drought resistance in soybean production.

Key words: coronatine, irrigation, soybean, photosynthetic characteristics, yield

Fig. 1

Monthly precipitation (bar) and temperature (line) during summer soybean growth period in 2015, 2016, and average of 25 years at Wuqiao"

Table 1

Effects of COR on yield and yield components in soybean under different irrigation conditions"

年度
Year		 灌溉
Irrigation		 处理
Treatment		 株荚数
Pods per plant		 株粒数
Grains per plant		 百粒重
100-grain weight (g)		 产量
Yield (kg hm-2)
2016 正常灌溉
Conventional irrigation		 CK 35.6 a 73.6 a 22.4 a 3216 a
COR 36.2 a 74.2 a 22.6 a 3283 a
不灌溉
Non-irrigation		 CK 27.6 c 55.4 c 17.2 c 2016 c
COR 29.8 b 60.1 b 18.6 b 2185 b
2015 正常灌溉
Conventional irrigation		 CK 33.9 a 63.4 a 21.8 a 3012 a
COR 34.2 a 65.1 a 22.1 a 3078 a
不灌溉
Non- irrigation		 CK 25.7 c 43.2 c 17.1 c 1548 c
COR 27.6 b 50.3 b 18.4 b 1877 b

Table 2

Effects of COR on agronomic traits and biomass in soybean under different irrigation conditions"

年度
Year		 灌溉
Irrigation		 处理
Treatment		 单株分枝数
Branches per plant		 株高
Height (cm)		 单株节数
Nodes		 单株生物量
Biomass (g)
2016 正常灌溉
Conventional irrigation		 CK 2.1 a 81.3 a 16.1 a 33.8 a
COR 2.2 a 80.6 a 16.4 a 34.0 a
不灌溉
Non-irrigation		 CK 1.1 b 70.6 c 15.1 b 27.3 c
COR 1.2 b 75.9 b 15.2 b 28.7 b
2015 正常灌溉
Conventional irrigation		 CK 1.8 a 76.5 a 15.1 a 31.2 b
COR 1.7 a 73.8 a 14.9 a 32.1 a
不灌溉
Non- irrigation		 CK 0.7 b 60.4 c 13.8 b 24.1 c
COR 0.9 b 67.3 b 14.0 b 26.2 b

Fig. 2

Effect of COR on the chlorophyll content and photosynthetic rate (Pn) in soybean leaves under different irrigation conditions A and B indicate the chlorophyll content of soybean leaves during 2015 and 2016 growing seasons, respectively. C and D indicate the photosynthetic rate in soybean leaves during 2015 and 2016 growing seasons, respectively."

Fig. 3

Effect of COR on the chlorophyll fluorescence parameters of soybean leaves under different irrigation conditions A and B indicate the maximal quantum yield of PSII (Fv/Fm) of soybean leaves during 2015 and 2016 growing seasons respectively. C and D indicate the actual photochemical efficiency of PSII (Yield) in soybean leaves during 2015 and 2016 growing seasons respectively."

Fig. 4

Effect of COR on the activities of RuBPcase in soybean leaves under different irrigation conditions A and B indicate the activities of RuBPcase of soybean leaves during 2015 and 2016 growing seasons respectively."

Fig. 5

Effect of COR on the activities of SPS in soybean leaves under different irrigation conditions A and B indicate the activities of SPS of soybean leaves during 2015 and 2016 growing seasons, respectively."

Fig. 6

Effect of COR on the leaf water potential under different irrigation conditions A and B indicate the leaf water potential during 2015 and 2016 growing seasons, respectively."

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