Germination and seedling vigour in Parkia platycephala Benth. in different substrates and temperatures

Abstract

RESUMO -Conhecida popularmente como fava de bolota, a Parkia platycephala Benth. pertence a família Fabaceae, ocorre em áreas de transição Caatinga-Cerrado e apresenta grande potencial madeireiro, paisagístico e, principalmente, forrageiro. O objetivo da pesquisa é fornecer informações para a elaboração de protocolos de testes de germinação de sementes e vigor de plântulas de P. platycephala, submetidas a diferentes subtratos e temperaturas. Para avaliar o efeito do substrato e da temperatura, as sementes foram semeadas entre os substratos: vermiculita, areia, pó de coco, bagaço da cana-de-açúcar, tropstrato®, papel (RP), marca Germitest e papel mata-borrão, distribuídas em caixas plásticas transparentes, todos sob luz contínua em germinador tipo Biochemical oxygen Demand (B.O.D.), com temperaturas constantes de 5; 10; 15; 20; 25; 30; 35 e 40 °C, e temperaturas alternadas de 20-30 ºC e 25-35 ºC. Foram avaliadas as variáveis germinação, índice de velocidade de germinação, tempo médio da germinação, comprimento da raiz primária e da parte aérea, e massa seca da raiz primária e da parte aérea. A temperatura alternada de 25-35 °C combinada com o substrato vermiculita é recomendada para realização de testes de germinação e vigor de P. platycephala. Palavras-chave: Fava de bolota. Sementes florestais nativas. Ecofisiologia.ABSTRACT -Parkia platycephala Benth., known locally as Fava de Bolota, belongs to the Fabaceae family and occurs in areas of Caatinga-Cerrado transition, having great potential for use as timber, in landscaping and mainly as forage. The aim of this research was to provide information for the preparation of test protocols for seed germination and seedling vigour in P. platycephala submitted to different substrates and temperatures. To evaluate the effect of substrate and temperature, the seeds were sown on the following substrates: vermiculite, sand, powdered coconut, sugarcane bagasse, Tropstrato®, Germitest paper (RP) and blotting paper, distributed in transparent plastic boxes under continuous lighting in a biochemical oxygen demand (BOD) germinator at constant temperatures of 5, 10, 15, 20, 25, 30, 35 and 40 °C, and alternating temperatures of 20-30 °C and 25-35 °C. The variables under evaluation were germination, germination speed index, mean germination time, primary root and shoot length and primary root and shoot dry weight. The alternating temperature of 25-35 °C combined with vermiculite is recommended for performing tests of germination and vigour in P. platycephala.

Temperatures and substrates for germination and vigor of <i>Erythroxylum pauferrense</i> Plowman seeds

“…Table 1 shows the occurrence of significant interactions between temperature and substrate (p < 0.05), indicating that there is at least one combination of these two factors that optimizes germination percentage. Bassaco et al (2014), Gomes, Oliveira, Ferreira, and Batista (2016) and Silva et al (2017) also reported a significant interaction between temperature and substrate for seed germination of other forest species of the Atlantic Forest.…”

“…Paper substrate at a temperature of 25°C produced the highest GSI for seeds of Diptychandra aurantiaca (Mart.) (Oliveira et al, 2013) Studying seeds of Parkia platycephala Benth., Silva et al (2017) found that the temperature of 30°C provided the best results for GSI in vermiculite substrate. Table 1.…”

“…Most forest species are propagated via seeds, so knowledge of the ecophysiological requirements for germination is indispensable since adequate development for the establishment of species depends on the tolerance of seedlings to different environmental conditions (Silva, Matos, Farias, Sena, & Silva, 2017). Knowledge of the conditions necessary for normal germination is also important for the artificial germination of seeds because species respond in different ways to numerous factors, including dormancy, environmental conditions, water availability, luminosity, and substrate (Carvalho & Nakagawa, 2012).…”

“…Accordingly, there is no optimum and uniform temperature for the germination of seeds of all species, although the range of 20 to 30°C has been recommended as ideal for the germination of seeds of various subtropical and tropical species (Guedes et al, 2011). Specific studies have provided information on the influence of substrates and temperatures on the germination of forest seeds (Oliveira, Ribeiro, Pereira, & Silva, 2013;Bassaco, Nogueira, & Cosmo, 2014;Gonçalves et al, 2015;Shibata, Pavelski, Miranda, & Oliveira, 2016;Silva et al, 2017).…”

Evaluation of Substrates for Jenipapo (Genipa americana L.) Seedlings Production

“…For the species Parkia platycephala Benth, the substrate coconut powder did not favor root and shoot dry matter (Silva et al, 2017). In jenipapo seedlings, Primo et al (2013) verified higher root and shoot dry matter when using the substrate tobacco stem + bovine manure.…”