Abstract
HIGHLIGHTS Potassium does not attenuate the deleterious effects of salt stress on the formation of seedlings of sour passion fruit. Water salinity increases the percentage of cell membrane damage in sour passion fruit seedlings. Salt stress inhibits growth of sour passion fruit but water with up to 3.5 dS m-1 can be used for formation of its seedlings.
Highlights
Sour passion fruit (Passiflora edulis Sims) is a species belonging to the Passifloraceae family (Bernacci et al, 2008), widely cultivated in the semi-arid region of Northeastern Brazil, due to edaphoclimatic conditions favorable to its development, standing out as a fruit crop of high profitability in family farming and guaranteed source of income throughout the year (Araújo et al, 2012)
In the semi-arid region of Northeastern Brazil, fruit growing is restricted to irrigated conditions, due to the spatialtemporal variability of rainfall, combined with high evaporative demand and the reduction in the availability of water of low electrical conductivity, so the use of water resources of restrictive quality to agricultural production becomes necessary (Freire et al, 2016; Andrade et al, 2019)
Potassium fertilization should be considered as an alternative capable of alleviating the effects of salt stress on plants, due to the functions that this macronutrient performs in the plant biochemistry and physiology (Abbasi et al, 2016; Ahanger et al, 2017), acting as enzymatic activator, in osmotic adjustment and maintenance of cell turgor, as well as in the regulation of cytoplasmic homeostasis of pH (Barragan et al, 2012)
Summary
Sour passion fruit (Passiflora edulis Sims) is a species belonging to the Passifloraceae family (Bernacci et al, 2008), widely cultivated in the semi-arid region of Northeastern Brazil, due to edaphoclimatic conditions favorable to its development, standing out as a fruit crop of high profitability in family farming and guaranteed source of income throughout the year (Araújo et al, 2012). Potassium fertilization should be considered as an alternative capable of alleviating the effects of salt stress on plants, due to the functions that this macronutrient performs in the plant biochemistry and physiology (Abbasi et al, 2016; Ahanger et al, 2017), acting as enzymatic activator, in osmotic adjustment and maintenance of cell turgor, as well as in the regulation of cytoplasmic homeostasis of pH (Barragan et al, 2012) It is involved in stomatal movement, protein synthesis, photosynthesis, osmoregulation, transport in phloem and in the reduction of excessive absorption of ions such as Na+ (Ahanger et al, 2017)
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