| Effects of exogenous growth regulators on photosynthetic parameters and yield of sorghum |
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| DOI：10.7606/j.issn.1000-7601.2022.02.10 |
| Key Words: sorghum uniconazole diethyl hexanoate yield photosynthetic fluorescence |
| Author Name | Affiliation | | WANG Jiaxu | Sorghum Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | ZHANG Fei | Sorghum Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | WANG Yanqiu | Sorghum Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | ZOU Jianqiu | Sorghum Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | ZHU Kai | Sorghum Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | ZHANG Zhipeng | Sorghum Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | LU Feng | Sorghum Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China |
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| Abstract: |
| In this study, the sorghum variety Liaonian 3 was used as the test material from 2019 to 2020. Different concentrations of retarding (Uniconazole) and promoting (Diethyl aminoethyl hexanoate) growth regulators were used to analyze yield, agronomic traits, photosynthesis and chlorophyll fluorescence parameters. The result showed that there was no difference in the yield of spraying Diethyl aminoethyl hexanoate. The spraying of Uniconazole growth regulator significantly increased the yield by 3.17%~13.51%. When spraying 60 mg·L-1 Uniconazole, the yield reached the maximum（8 989.49 kg·hm-2）, and the plant height was reduced 19.72% in this treatment, stem thickness, ear length and dry matter quality were increased by 24.12%、22.13% and 7.02%, and the yield and dry matter were significantly positively correlated (R=0.94**). During the filling stage, the chlorophyll SPAD value of functional leaves increased by 17.45%, and the net photosynthetic rate increased by 8.37%~13.60% compared with the control. Simultaneously, the chlorophyll fluorescence parameters were improved, and Fv/Fm, Fv/F0 and qP were significantly increased by 2.12%、20.50% and 41.50% compared with the control. The Fv/Fm, Fv/F0 and qP were significantly positively correlated with yield. In general, the application of Uniconazole 60 mg·L-1 (225 L·hm-2) in sorghum improved electron transfer efficiency and the population photosynthesis, optimized the source\|sink relationship and achieved higher yield. |
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