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Title: A comparative study of the thermal ranges of three germination criteria of a tropical tree with bioeconomic interest: Carapa surinamensis miq. (meliaceae)
Other Titles: Estudo comparativo sobre a variação térmica em três critérios de germinação de uma árvore tropical com interesse econômico: Carapa surinamensis Miq. (Meliaceae)
Authors: Amoêdo, Semirian C.
Ferraz, Isolde Dorothea Kossmann
Keywords: Agriculture
Comparative Study
Growth, Development And Aging
Seed Plant
Radiation Response
Hot Temperature
Issue Date: 2019
metadata.dc.publisher.journal: Revista Brasileira de Biologia
metadata.dc.relation.ispartof: Volume 79, Número 2, Pags. 213-219
Abstract: Species of the Carapa spp complex, occurring in the Neotropics, Africa and India, have multiple uses, including timber, with the seed oil being used in phyto-pharmaceutical products and cosmetics. This study aimed to determine the thermal ranges of the germination process, comparing germination criteria used by seed physiologists and seed technologists, and to suggest recommendations for seed quality assessment. Germination was assessed at constant temperatures between 10-40 °C using three germination criteria: (1) radicle length ≥ 0.5 cm (physiological criterion); (2) epicotyl length ≥ 1 cm; and (3) epicotyl length ≥ 5 cm (criterion for seed quality tests). The base temperature was similar for the three criteria and ranged between 10-2 °C. The Maguire’s Speed Index indicated 30 °C as most adequate. However, the upper temperature limit differed: for radicle protrusion it was above 40 ºC; and for both epicotyl lengths, it was between 35-40 °C. Seed coat removal accelerated the germination process of these recalcitrant seeds, and is recommended for seed quality assessment, which allows completion of the germination trial in approximately one month. © 2019 Associação Brasileira de Saúde Coletiv.
metadata.dc.identifier.doi: 10.1590/1519-6984.177898
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