Seed vigor and germination of facheiro plants (Pilosocereus catingicola (Gurke) Byles & Rowley Subsp. Salvadorensis (Werderm.) Zappi (Cactaceae) at different temperatures

Robson Luis Silva de Medeiros, Vênia Camelo de Souza, Gilvaneide Alves de Azerêdo, Miguel Avelino Barbosa Neto, Alex da Silva Barbosa, Ivan Sergio da Silva Oliveira

Abstract


Several species of endemic Cactaceae are found in northeastern Brazil, which are important plants to the local fauna and flora; nevertheless, there are only a few studies assessing the germination of this plant genus. Understanding the germination of species native to the Caatinga is essential to subsidize conservation actions for such ecosystem. The objective of this study was to investigate the influence of three localities and different temperatures on the vigor and germination of facheiro seeds. The experiment was conducted by evaluating seed vigor and germination in three distinct areas (Arara, Bananeiras, and Boa Vista) at different temperatures (20, 25, 30, 35, 40, and 20-30 ºC). Quantitative data were submitted to polynomial regression analysis at 5% significance with four replicates of 50 seeds. In Arara, germination rates at 20 and 25 ºC reached 96% and, at 30 ºC, 86%. The temperatures of 25 and 30 ºC presented the best germination speed index. For the three studied areas, the highest germination rates were recorded at a constant temperature of 25 ºC and at the alternating temperature (20-30 ºC). Yet the highest germination speed was reached at 30 ºC. Based on its sexual propagation, the taxon in question is able to survive in environments with temperatures ranging from 20 to 30 ºC, as seen in the studied habitats.

Keywords


Agreste of Paraíba state; Facheiro; Physiological potential.

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DOI: http://dx.doi.org/10.5433/1679-0359.2017v38n5p2873

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional