Abstract
The conservation of seed quality during storage is important to perform the maintenance and conservation of germplasm banks. Several native species of Brazil are intolerant to desiccation to desirable levels for conservation during storage is necessary to develop specific technologies for their conservation. The objective of this research was to evaluate the physiological quality of Paquira aquatica seeds submitted to drying periods. The study was carried out using seeds of P. aquatica dried at a temperature of 35 ºC, the following exposure times: 0 (no drying), 24, 48, 72 and 96 hours. Before and after each period of drying samples for the evaluations, the data were submitted to analysis of variance and regressionat level of 5%. The seeds of P. aquatica were dispersed with very high water content and a small reduction in its physiological value agrees quality, allowing the seeds to characterize this as a recalcitrant species. The drying temperature is 35 ºC until the viable 24 hours after this period the water content of seed reduced from 55% to 43%, which was considered the critical level for desiccation of seeds of P. aquatica. Because it reduces the values of first count, germination, rate of germination and growth of seedlings.The drying temperature the 35 ºC until the viable 24 hours, whit small reduction in its physiological quality seed P. aquatica.
Highlights
Pachira aquatica Aubl. is a native fruit tree from southern Mexico and northern Brazil, widely used in urban afforestation, may occur in wetlands and the distribution limit of mangroves and in dry soils due to its adaptability in adverse climatic and soil conditions (Lorenzi et al, 2006; Lima et al, 2012; Infante-Mata et al, 2014)
The observed lipid content (46.62%) in P. aquatica seeds was higher than that found in Glycine max L. (19.0-31.0%) (Sharma et al, 2014; Sheykhbaglou et al, 2018) and Sterculia striata St Hil (23.9%) seeds (Fráguas et al, 2015), and similar to that of the seed of Helianthus annuus L. (35.0-42.0%) (Premnath et al, 2016) and Arachis hypogaea L. (44.0-56.0%) (Kaya et al, 2009)
The seed moisture content of Paquira aquatica seeds submitted to different drying periods at 35 oC (Figure 1), the data were adjusted to the linear model, there being a reduction in the water content of the seeds with the increase of the drying periods
Summary
Pachira aquatica Aubl. is a native fruit tree from southern Mexico and northern Brazil, widely used in urban afforestation, may occur in wetlands and the distribution limit of mangroves and in dry soils due to its adaptability in adverse climatic and soil conditions (Lorenzi et al, 2006; Lima et al, 2012; Infante-Mata et al, 2014). Its seeds have a high oil content, 46.62%, and a significant amount of proteins, 13.75%, typical characteristics of oleaginous species, and can be a good source for economic exploitation (Silva et al, 2010). P. aquatica an excellent fount basis for developing well adapted and high yielding alternative oilseeds from the native flora for sustainable biodiesel production in Northeastern Brazil (Harand et al, 2016). This species is adaptable to the medium-sized, fast-growing crop and produces a large quantity of fruits with edible seeds with organoleptic characteristics (Jorge & Luiza, 2012). Its seeds are expenses with high moisture content, which makes it unfeasible to manage and store
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