2 research outputs found
Tratamentos para quebra de dormĂȘncia, temperaturas e substratos na germinação de Adenanthera pavonina L. Treatments for breaking dormancy, temperatures and substrata on Adenanthera pavonina L. germination
No full textDesenvolveu-se, esse trabalho, com o objetivo de avaliar tratamentos prĂ©-germinativos para quebra de dormĂȘncia bem como a temperatura e substratos ideais para a germinação de sementes de Adenanthera pavonina L.. No primeiro experimento as sementes foram tratadas com ĂĄcido sulfĂșrico durante 10 e 20´ (H2SO4), ĂĄcido sulfĂșrico 20´ + imersĂŁo por 24 horas em ĂĄcido giberĂ©lico (GA) 100mg.L-1; acetona por 20´ e testemunha. A incubação foi realizada em temperatura alternada de 20/30°C, e temperaturas fixas de 25°C e 30°C. No segundo experimento, as sementes foram tratadas com ĂĄcido sulfĂșrico 15´ e a semeadura nos substratos sobre papel, rolo de papel e entre areia, nas temperaturas de 18ÂșC, 20/30ÂșC, 25ÂșC e 30ÂșC. Observaram-se maiores valores de germinação nas sementes tratadas com H2SO4 por 10´ (83%), nĂŁo havendo diferença significativa entre as temperaturas, em ambos os experimentos. Com relação ao substrato foi observado que as sementes germinaram melhor nos substratos sobre papel e em rolo de papel (mĂ©dia de 86%). Entretanto, no segundo experimento, o IVG foi maior a 18°C (1,22) e no substrato sobre papel (1,33), nĂŁo variando significativamente da temperatura alternada 20/30°C. A maior porcentagem de germinação na primeira contagem variou de 30% (18Âș C) a 13% (30Âș C), sendo maior em rolo de papel (43%). O nĂșmero de dias para alcançar 50% de germinação variou de 3,33 a 13 dias nos tratamentos com H2SO4. NĂŁo foi observada diferença significativa no peso seco das plĂąntulas (1,08g), submetidas a diferentes temperaturas e substratos.<br>This work was carried out with the objective of evaluating pre-germinative treatments for breaking the dormancy as well as the ideal temperature and substrata the germination of Adenanthera pavonina L.. In the first experiment, seeds were treated with sulfuric acid during 10 and 20 minutes; 20 minutes in sulfuric acid + immersion for 24 hours in GA 100mg.L-1; acetone for 20 minutes and control. Incubation was done in alternate temperature of 20/30°C, and in fixed temperatures of 25°C and 30°C. In the second experiment, seeds were treated with sulfuric acid for 15 minutes and sowing was mode on paper, roll of paper and among sand as substrata, in temperature of 18°C, 20/30°C and 30°C. One observed that the high germination value in the seed which were treated with sulfuric acid for 10 minutes showed the best germination (83%), and there was not significative difference among temperatures for both experiments. Regarding to substratum it, was observed that seeds have the better germination on paper and on roll of paper (average of 86%). However, germination velocity index was higher at 18°C (1.22) and on paper (1.33) for the second experiment, which did not varied significantly from alternated temperature of 20/30°C. The highest percentage of germination of the first counting varied from 30% (18°C) to 13%(30°C), which were higher on roll of paper (43%). The number of days to reach 50% of germination varied from 3.33 to 13 days for treatments with H2SO4. It was not observed significative difference on dried weight of seedlings (1.08g) submitted to differents temperatures and substratum
