Abstract
The attributes that confer seed quality can largely be considered dependent on the coat. The aim of this study was to evaluate the quality and hydration pattern of the seeds of four contrasting soybean genotypes for the coats characteristics; BMX Potencia RR and CD 202 with yellow coats and IAC and TP with black coats. The first stage of the study consisted of seed multiplication in the 2012/2013 harvest. After storage for five months at a temperature of 17 oC and a relative humidity of 50%, the seeds were subjected to the following tests: germination, first count and seedling height, with and without immersion of the seeds, emergence in soil, emergence speed and germination index; electrical conductivity; thousand weight seeds and imbibitions of seeds. The design was completely randomized, with five replicates. The data was subjected to variance analysis and the means compared using the Tukey test at a 5% level of probability. Regression analysis was used for the seeds imbibitions test. Genotypes with black coats (especially IAC) presented better physiological quality in relation to genotypes with yellow coats. The latter had greater thousand weight seeds. BMX Potencia RR presented greater hydration than the other genotypes in the first hours of imbibitions and TP, the least. Genotypes with black coats emitted a radicle faster than the yellow coats genotypes.
Highlights
The soybean coat is the modulator of the interactions between the internal structures of the seed and the external environment
Despite the progress made over the years in the area of seed science and technology, the study by Carraro and Peske (2005) showed that the physiological quality of soybean seeds from certain regions had been compromised by elevated levels of deterioration due to humidity and the rupture of the coat associated with mechanical damage at harvest and during postharvest
The present study aimed to evaluate the physiological quality and hydration pattern of the seeds of four contrasting genotypes for the coat characteristics; two with yellow coats and two with black coats
Summary
The soybean coat is the modulator of the interactions between the internal structures of the seed and the external environment. Despite the progress made over the years in the area of seed science and technology, the study by Carraro and Peske (2005) showed that the physiological quality of soybean seeds from certain regions had been compromised by elevated levels of deterioration due to humidity and the rupture of the coat associated with mechanical damage at harvest and during postharvest. This situation is due to the fragility of the coat of the cultivars currently available for agricultural use. This characteristic is variable between the different genotypes (FLOR et al, 2004)
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