PHOTOSYNTHETIC CHARACTERISTICS IN SEEDLINGS OF INGA EDULIS SUBJECTED TO DIFFERENT NITROGEN SOURCES
DOI:
https://doi.org/10.24979/265Keywords:
Mineral nutrition, Ammonium, Nitrate, PhotosynthesisAbstract
The aim of this study was to investigate the photosynthetic characteristics in seedlings of Inga edulis subjected to different nitrogen sources (NH 4 and NO 3 ). The study was conducted in a greenhouse at INPA (3o 05'30'' S and 59o 59'36'' W). Plants of I. edulis were inoculated with strains of rhizobio and acclimatized in shade (75%). The experiment consisted of treatments: Control = nutrient solution without added nitrogen, NH 4 = nutrient solution with addition of ammonium (5 mM), and = NO 3 nutrient solution with addition of nitrate (5 mM). After 106 days were determined: specific leaf area (SLA), gas exchange, chloroplastidic pigments (chlorophylls a, b and carotenoids), chlorophyll content index (CCI), total nitrogen and chlorophyll fluorescence. The average value of photosynthesis (A) for the treatment NH 4 was 37 to 30% higher compared with the treatments NO 3 and control, respectively. For chloroplastidic pigments, NH 4 treatment exhibited higher value to the chlorophyll a, b and carotenoids. The other variables showed no differences between treatments. The performance of seedling of I. edulis seems to respond more effectively in the presence of NH 4 . However, difference was observed only for photosynthesis and chlorophyll content. In other parameters such effect is not observed. Therefore, further studies including modifying the dosage of nitrogen sources are necessary to understand what assimilable nitrogen preferable by I. edulis for greater uptake of carbon.
Downloads
References
Downloads
Published
Issue
Section
License
This work is licensed under a Creative Commons Attribution 4.0 International License.
The entire content of this magazine is protected by the Copyright Law (9,610 / 98). The partial or complete reproduction of articles, photographs or art in general contained in the publications must be credited to the author in question. The magazine Ambiente: Gestão e Desenvolvimento (ISSN 1981-4127) is distributed under the Creative Commons license - Attribution - commercial use - sharing under the same license (BY). There is permission to use and create works derived from the material, as long as there is attribution of credits (BY). Publications are distributed free of charge on the official website.
