Abstract
ABSTRACT Seed deterioration is a natural and irreversible process. Nevertheless, seed priming with water and antioxidants can minimize oxidative damage in oilseeds, resulting in attenuation of seed deterioration. The objective of this assay was to evaluate seed priming on respiratory activity of Jatropha curcas submitted to accelerated aging. Seeds from two provenances (Janauba and Pedro J. Caballero) were submitted to three priming treatments (control, immersion in deionized water, and with 750 µmol L-1 of ascorbic acid) and treated for accelerated aging at 41 °C for 72 h. The results showed that the priming of J. curcas seeds promoted tolerance to accelerated aging. Primed seeds, with ascorbic acid from Janauba and deionized water from Pedro J. Caballero, resulted in a higher percentage of normal seedlings, and increased germination speed index and seed respiration. The decline of physiological quality of J. curcas seeds after accelerated aging is directly associated with a reduction in respiratory activity that is related to seed moisture content.
Highlights
Jatropha curcas (Euphorbiaceae), commonly known as physic nut, is native to the American tropics and is used to produce biodiesel feedstock (Abhilash et al 2011)
The results showed that the priming of J. curcas seeds promoted tolerance to accelerated aging
Based on the above arguments, the assay of the present study aimed to evaluate the effects of priming on the physiological quality and respiratory activity of J. curcas seeds submitted to accelerated aging
Summary
Jatropha curcas (Euphorbiaceae), commonly known as physic nut, is native to the American tropics and is used to produce biodiesel feedstock (Abhilash et al 2011). The oil of J. curcas is non-edible due to toxic constituents of the seeds, as a consequence its exploitation does not compromise food production (Koh & Ghazi 2011). This plant exhibits drought tolerance and is cultivated (Costa et al 2015). An increase in total peroxide accumulation and in the content of malondialdehyde occurs in aged seeds, along with decreased activity of antioxidant enzymes (Goel et al 2003). Based on the above arguments, the assay of the present study aimed to evaluate the effects of priming on the physiological quality and respiratory activity of J. curcas seeds submitted to accelerated aging
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