Padronização e avaliação do potencial fisiológico de sementes de Mimosa caesalpiniifolia Benth. pelo teste do pH do exsudato

Abstract

ABSTRACT

Evaluating seed vigor contributes to ensuring the regulatory quality of the lot and, to facilitate obtaining this information, there are rapid tests that simplify the process. However, due to the scarcity of information on seeds of native forest species, it is necessary for methodologies to be adjusted and standardized, taking into account their particularities. Based on this budget, the present work aimed to adapt the methodology of testing the pH of the exudate with phenolphthalein in the evaluation of the regulatory quality of Mimosa caesalpiniifolia Benth. seeds, evaluating the effect of volume, temperature and time of imbibition. Water content of seeds and seedlings, first count and electrical conductivity were observed as variables. The species for study belongs to the Fabaceae family, native to the Caatinga, popularly known as sabiá, unha-de-gato or sansão-do-campo, being identified as a pioneer species with high economic potential, which can be used for fodder and in the timber sector. The seeds used were collected in the municipalities of Rio Largo and Maceió (Alagoas), and the experiments were controlled at the Plant Propagation Laboratory at CECA-UFAL. The experiments were in a completely randomized design with four replications for each lot. For the evaluation of the physiological behavior as a function of the pH of the exudate, the results were confirmed by the analysis of variance, in a triple factorial scheme of the type 2 x 2 x 3 (2 lots x 2 imbibition volumes (5 and 10 mL) and 3 periods of imbibition (16, 18 and 24h)) at temperatures of 30 and 35 oC. From this, it was found that the first count (PMC), germination percentage (G%), germination speed index (IVG), root length (CPR), shoot length (CPA), total length (CT ) and dry mass (DM) are tested at 5% probability by the F test. The exudate pH test with phenolphthalein as an indicator is efficient to evaluate the viability of Mimosa caesalpniifolia seeds, for faster results, the test should be carried out applying a period of 16 hours of imbibition and a minimum volume of 5mL of distilled water.

Keywords: vigor, sabiá, forest seeds.