Aspectos Fisiológicos e Bioquímicos da Germinação de Sementes de Inajá (Maximiliana maripa (Aublet) Drude)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The family Arecaceae is represented as the third most important man communities and the first for traditional and indigenous communities in the Amazon region. Maximiliana maripa (Aublet) Drude, commonly known as palm inaja, stands out for having rich almond oil, and other economic importance. As the propagation of this species made by seed, studies related to germination physiology and biochemical composition of organic reserves and their mobilization during germination, are important for understanding the life cycle of this plant and its strategies of businesses seedlings. Therefore, the objective of this study was to obtain information on the morpho-physiological aspects of seeds and germination, quantification of lipid reserves and their mobilization. The fruits of M. maripa were collected in the municipality of Mucajai in Roraima. For the water content were taken two repetitions of 10, 20, 30 and 40 seeds and the internal and external structure, 100 seeds were measured lengthwise and crosswise, and then photographed during the germination process. For studies of germination, four replicates containing 25 seeds were sown in plastic trays using vermiculite as substrate and were stored at room temperature and in germination chambers at 25, 30 and 35oC. The analysis of lipids was performed in quiescent seeds and in four stages of germination: cotyledonary sheath appearance, primary root, adventitious root and first eophyll. Germination inaja characterized as remote tubular, hypogeal and cryptocotylar. Presented a low percentage of seeds germinated at all temperatures. However, the temperature significantly influence the percentage and pattern of distribution of germination over time, and the 35oC obtained the highest percentage of germinated seeds (28%). The germination process is long and uneven, starting at 19 days and stabilized at approximately 86 days. The quantification of lipid reserves in quiescent seeds showed a high percentage of oil (72,45%), decreasing during germination, reaching the last stage of germination (first eophyll) with 61,17%. We identified eight different fatty acids independent of the degree of saturation (caprylic, capric, lauric, myristic, palmitic, stearic, oleic, linoleic). In quiescent seeds not found the polyunsaturated fatty acids, suggesting the synthesis of the germination period.

ASSUNTO(S)

palmeira maximiliana maripa inajá sementes germinação botanica lipídios

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