PROPAGAÇÃO SEMINÍFERA DE Cordia oncocalyx (Allemão) Baill. E CARACTERIZAÇÃO BIOMÉTRICA DE DIÁSPOROS E SEMENTES

Jayane Karine Pereira de Araújo; Jéssica Sabrina Ovídio de Araújo; Diógenes Fernandes dos Santos; Mauro Vasconcelos Pacheco; Poliana Coqueiro Dias Araujo

doi:10.1590/1983-21252022v35n116rc

Authors

Jayane Karine Pereira de Araújo Center for Agricultural Sciences, Universidade Federal da Paraiba, Areia, PB https://orcid.org/0000-0002-3724-643X
Jéssica Sabrina Ovídio de Araújo Academic Unit Specialized in Agricultural Sciences, Universidade Federal do Rio Grande do Norte, Macaíba, RN https://orcid.org/0000-0002-9823-4379
Diógenes Fernandes dos Santos Department of Civil Engineering, Universidade Federal do Rio Grande do Norte, Natal, RN https://orcid.org/0000-0002-0166-5034
Mauro Vasconcelos Pacheco Academic Unit Specialized in Agricultural Sciences, Universidade Federal do Rio Grande do Norte, Macaíba, RN https://orcid.org/0000-0002-0447-9800
Poliana Coqueiro Dias Araujo Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN https://orcid.org/0000-0002-5744-2251

DOI:

https://doi.org/10.1590/1983-21252022v35n116rc

Keywords:

Digital biometrics. In vitro germination. Germplasm conservation. Seedling production.

Abstract

Cordia oncocalyx Allemão Baill., widely known as “pau-branco”, is a native species from the Caatinga (Brazilian Savannah) and has socioeconomic and environmental potential; however, there are few silvicultural studies on this species. Therefore, this paper aimed to analyze and compare the biometric characteristics of diaspores and seeds through manual biometrics and by digital image processing, and to evaluate the in vitro and ex vitro germination of C. oncocalyx. In the biometrics evaluation, three hundred diaspores and three hundred seeds were used, applying manual and digital biometrics. Subsequently, ex vitro emergence was determined, testing mechanical scarification (in different regions of the diaspore) and chemical scarification (immersion in sulfuric acid for 90 min and 180 min). Finally, in vitro germination was tested with different compositions of Murashige & Skoog (M&S) culture medium and sucrose addition. Results showed that digital image processing is a viable and fast technique to obtain the biometric parameters of C. oncocalyx fruit and seeds. Chemical and mechanical treatments on diaspores have not influenced seed emergence (0.33%). The composition of the culture medium has influenced the germination percentage, and the maximum value of 96% % was obtained with 6 g/L of sucrose and 0.90 g/L of M&S medium. Thus, the seminiferous propagation of C. oncocalyx can be performed successfully when the seeds are germinated in vitro, and the digital image processing shows the solidity and applicability aiming to evaluate the quantitative parameters of seed and fruit of this species.

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