Temperature and substrate on Plukenetia volubilis L. seed germination/ Temperatura e substrato na germinacao de sementes de Plukenetia volubilis L

• Published in: Revista brasileira de engenharia agrícola e ambiental 2016-11, Vol.20 (11), p.1031
• Main Authors: da Silva, Givanildo Z, Vieira, Vanessa A.C, Boneti, Joao E.B, Melo, Lilian F, Ma
• Format: Article
• Language: English
• ISSN: 1415-4366
• DOI: 10.1590/1807-1929/agriambi.v20n11p1031-1035

The objective of this work was to evaluate the effect of temperature and substrate on the germination of P. volubilis seeds. Seeds harvested from 25 matrix plants were submitted, in two studies, to conditions of (i) sowing in rolled paper towel at the temperatures of 10, 15, 20, 25, 30, 35, 40, and 45 [degrees]C, for the evaluation of germination, first count of germination, germination speed index and mean time for germination, and (ii) sowing in the substrates paper towel, sand, Bioplant[R], Bioplant[R] and micron, superfine, fine, medium and coarse vermiculite. The same evaluations mentioned in the first study were conducted at the temperature of 30 [degrees]C, as well as plant growth. The treatment replicates were distributed in a completely randomized block design and the effects of temperature were compared by polynomial regression analysis. The substrates were compared by the Scott-Knott test at 0.05 probability level. The data show that the ideal range of temperature for the germination of P. volubilis is between 25 and 30 [degrees]C. The temperature of 20 [degrees]C is the minimum for germination and those above 35 [degrees]C are lethal to these seeds. The most favorable substrate for P. volubilis seed germination is micron or fine vermiculite. Key words: sacha inchi oil crop Euphorbiaceae omega-3 Amazon plant Objetivou-se, neste trabalho, avaliar o efeito de temperaturas e substratos na germinacao de sementes de P. volubilis. Sementes colhidas em 25 plantas matrizes foram avaliadas em dois estudos: (i) semeadura em rolo de papel nas temperaturas 10, 15, 20, 25, 30, 35, 40 e 45 [degrees]C, avaliando-se a germinacao, primeira contagem, indice de velocidade de germinacao e tempo medio de germinacao; e (ii) semeadura nos substratos rolo de papel, entre areia, entre Basaplant[R], entre Bioplant[R] e entre vermiculita micron, superfina, fina, media e grossa; conduzindo-se a 30 [degrees]C os mesmos testes descritos no primeiro estudo e tambem o crescimento de plantulas. Os dados foram analisados em delineamento inteiramente casualizado com analise de regressao polinomial para a avaliacao das temperaturas. Para a comparacao entre os substratos utilizou-se o teste de Scott Knott, a 0,05 de probabilidade. Conclui-se que a germinacao de sementes de P. volubilis deve ser conduzida nas temperaturas de 25 a 30 oC. A temperatura de 20 oC e a minima para a germinacao e as acima de 35 oC sao letais para essas sementes. O substrato mais favoravel a germinacao de s