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

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.

Physiological quality of forage palm seeds and seedlings associated with the level of ploidy

“…Seedling emergence also differed statistically between ploidy levels, varying from 23 to 44%, in diploid and octaploid cultivars, respectively (Figure 1A). When the emergence is compared with other species of cacti, it is considered low, since research involving facheiro seeds (Pilosocereus catingicola) with fruits harvested in different municipalities in Paraíba, resulted in an emergence percentage ranging from 60 to 80% (Medeiros et al, 2015). However, it is superior to that observed by Guedes et al (2009) when evaluating the germination and vigor of forage palm seeds after treatment to overcome seed dormancy.…”

Germinação e crescimento de plântulas in vitro de Pilosocereus pachycladus Ritter (Facheiro) submetidos em diferentes meios de cultivo

“…Portanto estudos sobre a germinação de sementes auxiliam na conservação desse recurso natural, possibilitando a obtenção de plantas através da propagação diminuindo a necessidade da coleta de material na natureza (Medeiros et al, 2017). Nesse contexto, a técnica de cultivo in vitro vem sendo empregada com êxito para propagação em diferentes espécies de cactáceas (Civatti et al, 2017;Torres-Silva et al, 2018).…”