Abstract
In an experimental site for reforestation of degraded area, three-year-old plants of Bertholletia excelsa Humb. & Bonpl. were subjected to different fertilization treatments: T0 = unfertilized control, T1 = green fertilization (branches and leaves) and T2 = chemical fertilization. Higher net photosynthetic rates (P N) were observed in T1 [13.2±1.0 μmol(CO2) m−2 s−1] compared to T2 [8.0±1.8 μmol(CO2) m−2 s−1] and T0 [4.8±1.3 μmol(CO2) m−2 s−1]. Stomatal conductance (g s), transpiration rate (E) and water use efficiency (WUE) of individuals of T1 and T2 did not differ significantly, however, they were by 88, 55 and 63%, respectively, higher in T1 than in the control. The mean values of variable fluorescence (Fv), performance index (P.I.) and total chlorophyll [Chl (a+b)] were higher in T1. Our results indicate that green fertilization improves photosynthetic structure and function in plants of B. excelsa in young phase.
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Abbreviations
- Car :
-
carotenoids
- Chl a :
-
chlorophyll a
- Chl b :
-
chlorophyll b
- Chl (a+b):
-
total chlorophyll
- E :
-
transpiration rate
- g s :
-
stomatal conductance
- Fm :
-
maximum fluorescence
- (Fv = Fm - F0):
-
variable fluorescence
- Fv/Fm :
-
maximum photochemical efficiency of PSII
- F0 :
-
initial fluorescence
- P N :
-
net photosynthetic rate
- P.I.:
-
performance index
- T0:
-
unfertilized control
- T1:
-
green fertilization
- T2:
-
chemical fertilization
- WUE:
-
water use efficiency
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Acknowledgements
Authors are grateful to the National Institute of Amazonian Research (MCT-INPA) and National Council for Scientific and Technological Development (CNPq, Brazil) for their financial support of this study. Many thanks to CMA-1oBIS-Amv in Manaus for their logistical support in the field. Further thanks are given to rewievers for their constructive comments on this manuscript and Dr. Ted R. Feldpausch (University of Leeds) for reviewing an early version of this manuscript.
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Ferreira, M.J., Gonçalves, J.F.C. & Ferraz, J.B.S. Photosynthetic parameters of young Brazil nut (Bertholletia excelsa H. B.) plants subjected to fertilization in a degraded area in Central Amazonia. Photosynthetica 47, 616–620 (2009). https://doi.org/10.1007/s11099-009-0088-2
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DOI: https://doi.org/10.1007/s11099-009-0088-2