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Effects of Four Plant Growth Regulators on Photosynthesis and Yield of Deschampsia cespitosa

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Abstract

To investigate the effects of plant growth regulators on photosynthesis and grass yield of tussock grass (Deschampsia cespitosa), a random block experiment was conducted, testing the effects of different chemicals on the photosynthesis and growth of the grass during heading stage. The treatments were: triacontanol (0.15, 0.30, 0.45 and 0.60 mg/L), auxin (20, 30, 40 and 50 mg/L), trinexapac-ethyl (141, 282, 423 and 564 g/hm2) and paclobutrazol (50, 100, 200 and 400 g/hm2). The results indicate that treatment with each of the four plant growth regulators increased the yield of D. cespitosa; however, treatment with 30 mg/L auxin had the best effect on improving the yield of fresh and dry hay, with an increase of 21.62 and 39.01%, respectively, compared to CK. Compared with CK, spraying with triacontanol had no significant effect on chlorophyll content and leaf area of D. cespitosa (P > 0.05), although spraying with 0.15 mg/L triacontanol resulted in a significant increase of net photosynthetic rate (26.68%), stomatal conductance (23.07%) and transpiration rate (11.11%) compared to CK (P < 0.05). After spraying 50.0 mg/L auxin, the chlorophyll content and leaf area of the leaves increased by 42.39 and 50.91% respectively compared to CK, and spraying 30 mg/L auxin resulted in a significant increase in the net photosynthetic rate (58.71%), stomatal conductance (47.37%) and transpiration rate (44.83%), which increased by and compared to CK (P < 0.05). Spraying 423.0 g/hm2 of trinexapac-ethyl had a significant impact on the chlorophyll content and leaf area of D. cespitosa leaves (P < 0.05), which increased by 53.63 and 34.15% respectively compared to CK. The concentration of trinexapac-ethyl had a significant impact on the net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, and transpiration rate of the leaves (P < 0.05), with an increase of 40.3, 50.0, 18.62 and 42.86%, respectively, compared to CK. Spraying 400 g/hm2 paclobutrazol had a significant impact on the chlorophyll content and leaf area (P < 0.05), which were 51.69 and 38.36% higher than the corresponding values in the CK group. Spraying 50.0 g/hm2 paclobutrazol significantly increased the net photosynthetic rate (54.5%), stomatal conductance (41.18%) and transpiration rate (45.76%) of the leaves of treated plants compared with the control (P < 0.05). In summary, spraying 30.0 mg/L of auxin during the heading stage of the D. cespitosa can significantly increase the net photosynthetic rate, stomatal conductance, and transpiration rate of the leaves. The auxin treatment produced the best results in terms of yield of D. cespitosa hay.

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ACKNOWLEDGMENTS

The authors would like to thank Zhang Min, Liu Ying and Ma YuShou for their help in the experiments. We would like to thank Editage for English language editing.

Funding

This work is supported by the Fundamental Research Funds for Key Project of the Ministry of Science and Technology of China. This work was supported by the National Key Project of the Ministry of Science and Technology of China (2021YFC3201603) and scientific research project of “Qinghai Scholars” in Qinghai Province (“A demonstration study on domestication and application of native ecological grass species in alpine region”).

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  1. H. Bin and Z. Min: These authors contributed equally to this work.

Authors and Affiliations

  1. Qinghai Academy of Animal and Veterinary Sciences, Qinghai Provincial Key Laboratory of Adaptive Management on Alpine Grassland, Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau, Qinghai University, 810007, Xining, China

    H. Bin, Z. Min, W. Yan-long, M. Yu-shou & L. Ying

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He Bin and Zhang Min are equally contributed in this work, and involved in experimental design, data collection, data analysis, manuscript writing. Liu Ying and Ma Yu-shou participated in the experimental design of this experiment.

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Correspondence to M. Yu-shou or L. Ying.

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Abbreviation: T, triacontanol; I, auxin; E, trinexapac-ethyl; P, paclobutrazol; A, net photosynthetic rate; E, transpiration rate; Ci, intercellular CO2 concentration; gs, stomatal conductance; hm, hectometer; CK, control group.

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Bin, H., Min, Z., Yan-long, W. et al. Effects of Four Plant Growth Regulators on Photosynthesis and Yield of Deschampsia cespitosa. Russ J Plant Physiol 70, 151 (2023). https://doi.org/10.1134/S1021443723601842

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