Development and gas exchange of fig plants submitted to dynamized high dilutions
DOI:
https://doi.org/10.5433/1679-0359.2024v45n6p1997Keywords:
Ficus carica, Secondary metabolism, Photosynthesis.Abstract
The productive potential of crops directly depends on their primary metabolism, for which photosynthetic efficiency is the best indicator. This study aimed to evaluate the effect of dynamized high dilutions on the development and photosynthetic efficiency of fig plants under greenhouse conditions. The treatments were Belladonna, Thuya occidentalis, and the nosode of fig leaves with rust at 30 CH (centesimal hahnemannian dilution order). Distilled water was the control treatment. The subplot consisted of fig cultivars Roxo de Valinhos and Branco Rosa Lages. Weekly sprays started 30 days after transplanting and lasted for 5 weeks. Plant height and total number of leaves were evaluated at 0, 37, 44, 51, 58, 65, 86, 100, and 114 days after transplanting. Photosynthetic efficiency was estimated at 5, 15, 30, and 50 days after the first application with an Infra-Red Gas Analyser – IRGA by measuring gas exchange: (a) CO2 assimilation rate, (b) transpiration rate, (c) stomatal conductance and (c) internal concentration of CO2 in the leaf. Water use and carboxylation efficiency were also determined. According to the data, the cultivar Roxo de Valinhos was more sensitive to the dynamized high dilutions concerning leaf emission per day and remaining leaves, and it showed a higher response to Thuya occidentalis and the nosode. Net photosynthesis increased after cumulative applications on the cultivar Roxo de Valinhos treated with Thuya and Belladonna. The dynamized high dilutions can influence plant development and photosynthesis, and Roxo de Valinhos is highly sensitive to such dilutions.
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