Abstract
Germinability and antioxidant metabolism in Passiflora caerulea L. seeds exposed to salt stress
Highlights
Passiflora is a genus with more than 500 species, predominantly tropical and subtropical, most of which have an ornamental, medicinal or edible interest
In a previous report it was found that, among a series of pre-germinative treatments, aril removal plus 24 h soaking at room temperature increased total germination percentage and germination rate of P. caerulea seeds (Mendiondo & Amela García, 2006)
While H2O2 generation as revealed by DAB staining decreased with imbibition time, the number of embryos showing positive nitroblue tetrazolium (NBT) staining increased during the pre-germinative period
Summary
Passiflora is a genus with more than 500 species, predominantly tropical and subtropical, most of which have an ornamental, medicinal or edible interest. The attempts to experimentally cultivate some species revealed the existence of serious difficulties in germination and uniformity of seedlings This may be the result of differences in either seed structure (e.g. hardiness and impermeability of the integuments), in the presence or absence of chemical inhibitors, or in the sensitivity to changes in environmental traits like soil salinity, soil pH or light intensity (Zucareli et al, 2009; Cárdenas-Hernández et al, 2011; Casierra-Posada et al, 2011; Montaña et al, 2014; dos Santos Moura et al, 2016). Amongst the Passiflora species growing in Argentina, P. caerulea L. is the one with the widest distribution, finding it from the north to the center of the country in a great variety of habitats (Deginani, 2001) It has many uses, edible or phytotherapeutic (e.g. Martínez Crovetto, 1981; Arenas, 1982; Busilacchi et al, 2008), reason why its natural populations are threatened due to the intense collection without replenishment, and the increasing urbanization of many of the areas where it grows. Only few of them addressed the response to salinity during seed germination and early seedling growth, with little or no knowledge of the relevance of the antioxidant metabolism in this process
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