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.
<p>A <em>Albizia niopoides</em> conhecida popularmente como angico branco é uma espécie florestal nativa de rápido crescimento, com elevado potencial para fins de reflorestamento. No entanto, existe pouca informação acerca de sua propagação seminífera. Dessa forma, objetivou-se avaliar o desempenho germinativo e vigor de sementes de <em>A. niopoides</em> sob diferentes volumes de água para umedecimento do substrato. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro repetições de 25 sementes cada. As sementes foram semeadas em papel germitest (organizado em rolos) umedecido com volumes de água equivalentes a 1,0; 1,5; 2,0; 2,5; 3,0; 3,5 e 4,0 vezes o peso seco do substrato, sem adição posterior de água. A germinação ocorreu em câmara de germinação tipo B.O.D, regulada a temperatura de 25 °C e sob luz contínua. As variáveis analisadas foram: porcentagem de germinação, comprimento da parte área e raiz primária, massa seca da parte aérea e sistema radicular de plântulas. Constatou-se efeito decrescente nos valores de porcentagem de germinação, comprimento da raiz primária e massa seca do sistema radicular, a partir do umedecimento do substrato com o volume de água equivalente a 2,0 vezes o seu peso seco. Os volumes de água na faixa de 1,0 a 2,0 vezes a massa do papel, favorecem a germinação e o vigor das sementes de <em>A. niopoides</em>.<strong> </strong></p>
This study aimed to determine the most appropriate conditions of temperature and substrate for germination and performance of A. niopoides seedlings. The design was completely randomized in 10x7 factorial arrangement (eight constant temperatures of 5, 10, 15, 20, 25, 30, 35, and 40°C and two alternating temperatures of 20-30 and 25-35°C, and seven substrates, that are paper towel, vermiculite, sand, blotting paper, coir dust, sugarcane bagasse, and tropstrato®) with four replicates of 25 seeds. The following variables were analyzed: (1) germination percentage; (2) germination speed index; (3) shoot length and primary root; and (4) dry weight of shoot and of root system. There was a significant interaction among the tested factors for all variables. The A. niopoides seeds germinate under a wide temperature range, with minimum and maximum limit at 10 and 40°C temperatures, respectively. Alternating temperatures of 20-30 and 25-35°C with sand substrate are ideal conditions for germination and performance of A. niopoides seedlings.
This study aims to evaluate the possible allelopathic effects of young and mature leaf extract from of two eucalyptus genetic materials on the physiological performance of millet seeds. The experiment was carried out in a completely randomized design, in a 5 × 2 × 2 factorial arrangement [five concentrations of the extract (0, 25%, 50%, 75%, and 100%) × two genetic materials (1 -Eucalyptus grandis × Eucalyptus urophylla and 2 -Eucalyptus grandis × Eucalyptus camaldulensis) × two maturation stages of leaves (young and mature leaves)] with four replicates, each one with 25 seeds. Seeding was performed on the germitest paper substrate distributed in Petri dishes, moistened with the extract according to the treatments, being allocated in biochemical oxygen demand (B.O.D) adjusted at 25˚C and 12 h photoperiod. Percentage, speed index, mean germination time, aerial part and primary root length, and dry matter weight of aerial part and root system of seedlings were evaluated. The leaf extracts of the two eucalyptus clones had all the analyzed variables changed with effect more evident on young leaf extract of the genetic material 1. It can be concluded that the tested genetic materials have a detrimental effect on the physiological performance of millet seeds. KeywordsAllelopathic, Germination, Pennisetum glaucum, Seedlings, Germination Speed How to cite this paper: Sousa, M.V., Farias, S
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