Effects of combined application of boron-molybdenum-copper microfertilizers on photosynthetic characteristics of Pseudostellaria heterophylla

YUAN Tingting, LU Yuanfeng, XIE Yinfeng, MA Yingli, WU Tong, NI Zhen

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (4) : 130-136.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (4) : 130-136. DOI: 10.12302/j.issn.1000-2006.202003024

Effects of combined application of boron-molybdenum-copper microfertilizers on photosynthetic characteristics of Pseudostellaria heterophylla

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Abstract

【Objective】We studied the regulatory effect of the combined application of B, Mo, and Cu microfertilizers on the photosynthetic characteristics of Pseudostellaria heterophylla to provide a theoretical basis for the efficient cultivation of P. heterophylla. 【Method】A field experiment involving foliar spraying was carried out using a quadratic regression D-optimal design to explore the effects of microfertilizers on photosynthetic gas exchange parameters and fluorescence parameters of P. heterophylla. 【Result】① Compared to the control, the photosynthetic pigment content, net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) of the fertilization treatment increased in varying degrees, whereas the intercellular carbon dioxide concentration (Ci) decreased significantly (P<0.05). The results showed that the improvement in photosynthetic capacities of P. heterophylla was mainly due to the relief of non-stomatal limiting factors. ② During the experiment, compared to the control, the PSⅡ maximum photochemical efficiency (Fv/Fm), PSⅡ effective photochemical efficiency (Fv'/Fm'), electron transfer rate (ETR), and photochemical quenching coefficient (qP) of the suitable treatment also increased; whereas, the non-photochemical quenching coefficient (NPQ) decreased. The microfertilizer treatment could enhance the efficiency of the absorption, conversion and utilization of light energy in the photosynthetic system and alleviate the enhanced heat dissipation caused by excess excitation energy. ③ The range analysis and single factor analysis of variance showed that boron played the main role in affecting photosynthetic performance among the three microfertilizers, followed by copper. ④ The comprehensive analysis of membership function showed that the best fertilization formula for improving the photosynthetic performance of P. heterophylla was B3Mo2Cu1 (boron fertilizer 1.5 g/L, molybdenum fertilizer 0.08 g/L and copper fertilizer 0.1 g/L). 【Conclusion】The suitable combined application of boron, molybdenum and copper could effectively improve the photosynthetic performance of P. heterophylla, enhance the efficiency of absorption, transformation and utilization of light energy; while reduce heat dissipation and alleviate photoinhibition.

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Pseudostellaria heterophylla / boron-molybdenum-copper microfertilizer / gas exchange parameters / chlorophyll fluorescence parameters

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YUAN Tingting , LU Yuanfeng , XIE Yinfeng , et al . Effects of combined application of boron-molybdenum-copper microfertilizers on photosynthetic characteristics of Pseudostellaria heterophylla[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2021, 45(4): 130-136 https://doi.org/10.12302/j.issn.1000-2006.202003024

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