Abstract
The strong adaptability of Broussonetia papyrifera (L.) Vent. to low phosphorus (P) conditions can be attributed to the large amount of root-exuded organic acids and the high efficiency of P extraction. However, microelement contents are influenced by low-P stress, and their effects on the photosynthetic capability of B. papyrifera remain unknown. In this study, we investigated the effects of low-P treatment on net photosynthetic rate (P N); chlorophyll a fluorescence (ChlF) characteristics; and Fe, Mn, Cu, and Zn contents of B. papyrifera and Morus alba L. seedlings. Results show that B. papyrifera exhibited better photosynthetic capability under moderate P deficiency (0.125, 0.063, and 0.031 mmol/L P treatments), whereas the photosynthetic capability of M. alba decreased under moderate and severe P deficiency (0.016 and 0 mmol/L P treatments). Under moderate P deficiency, the decrease in Cu and Zn contents in B. papyrifera was lower than that in M. alba. Under severe P deficiency, a considerable decrease of photosynthetic capability in B. papyrifera and M. alba was associated with low Cu and Zn contents. The P N of the two Moraceae species exhibited a better correlation with Cu and Zn contents than with Fe or Mn content. P deficiency could not only decrease cyclic photophorylation and photosynthetic efficiency, but could also affect the stability of thylakoid membrane structure and electron transport efficiency by influencing the contents of Cu or Zn, thereby affecting photosynthesis.
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Abbreviations
- Φ PSII :
-
Actual photochemical quantum efficiency of PSII
- B. papyrifera :
-
Broussonetia papyrifera (L.) Vent
- ChlF:
-
Chlorophyll a fluorescence
- F s :
-
Fluorescence in stable state
- F o :
-
Initial fluorescence
- LSD:
-
Least significant difference
- F m :
-
Maximum fluorescence
- F′m :
-
Maximum fluorescence in the light-adapted state
- F v/F m :
-
Maximum quantum yield of PSII
- M. alba :
-
Morus alba L
- P N :
-
Net photosynthetic rate
- P:
-
Phosphorus
- PSII:
-
Photosystem II
- SE:
-
Standard errors
- F v :
-
Variable fluorescence
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Acknowledgments
This study was supported by the project of the National Natural Science Foundation of China (No. 31301243), a project funded by the Priority Academic Program Development of Jiangsu higher education institutions (PAPD), the research foundation for introduce talents of Jiangsu university (13JDG030), the brainstorm project on social development of Guizhou Province (SY[2010]3043).
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Xing, D., Wu, Y., Yu, R. et al. Photosynthetic capability and Fe, Mn, Cu, and Zn contents in two Moraceae species under different phosphorus levels. Acta Geochim 35, 309–315 (2016). https://doi.org/10.1007/s11631-016-0099-1
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DOI: https://doi.org/10.1007/s11631-016-0099-1