Implication of Ions and Organic Solutes Accumulation in Amaranth (<i>Amaranthus cruentus</i> L.) Salinity Resistance

Abstract

Salinity is one of the major environmental constraints limiting agricultural productivity in the world. The effects of salt stress on growth, ions and organic solutes accumulation were investigated in two amaranth (Amaranthus cruentus) cultivars: Rouge (salt-resistant) and Locale (salt-sensitive). Young plants of these cultivars were exposed, in hydroponic system, to three concentrations of NaCl: 0, 30 and 90 mM. Growth parameters, ions, free proline and soluble sugars concentrations were determined after 2 weeks of stress. NaCl effect resulted in plant growth reduction in both cultivars but plants of cultivar Rouge were less affected compared to that of cv. Locale. Na + , proline How to cite this paper: Wouyou, A., Prodjinoto, H., Zanklan, A.S., Vanpee, B., resistance in these cultivars and that soluble sugars may play an important role in salt-resistance in Amaranthus cruentus. However, proline appears as a symptom of injury in stressed plants rather than an indicator of resistance.

Response of African Basil (Ocimum gratissimum L.) to Salt Stress under Tropical Conditions in the Republic of Benin: Growth, Ions and Organic Solutes Accumulation

“…For these reasons, our research was focused on Na + . Results of this study showed that salt stress induced a significant increase in Na + content in both leaves and roots corroborating several previous reports on vegetable species [34,25]. In some genotypes of sweet basil, similar result was reported [21,19].…”

Ions and Organic Solutes as Implicated in the Ameliorative Effect of Exogenous Application of Calcium on Salt Stressed Tomato (Lycopersicon esculentum Mill.) Plants

“…Salinity caused an increase in Na content and a decrease in K content in the leaves as well as in the roots in tomato cultivar Padma plants evaluated in this study. This response of plant ion nutrition to salt stress in a common behavior as reported by several authors [40,41,42,43,28], suggesting that the NaCl detrimental effect on plant growth was due mainly to both Na toxicity and K deficiency. As revealed by our results, the exogenous application of both calcium forms improved plant mineral nutrition by reducing Na accumulation and enhancing K accumulation in both leaves and roots.…”

“…As revealed by our results, the exogenous application of both calcium forms improved plant mineral nutrition by reducing Na accumulation and enhancing K accumulation in both leaves and roots. Reducing Na accumulation and enhancing K accumulation mainly in leaves is one of the common plant strategies to tolerate NaCl salt stress as reported in several glycophyte species [44,45,46,43,28]. In okra (Abelmoschus esculentus), Habib et al [42] reported that the foliar application of both pure glycine betaine and sugarbeet extract reduced the adverse effects of salt stress on plant growth, yield and leaf K content.…”

“…Our results showed that the salinity increased the content of soluble sugars in the leaves and roots of tomato plants which is a general trend in plants submitted to salt stress as reported in several plant species such as sugarcane (Saccharum sp.) [46,47]; amaranth [43] and euphrates poplar (Populus euphratica) [48]. The exogenous application of calcium did not induce any significant change in soluble sugars content indicating that these solutes did not mediate the ameliorative effect of calcium on the growth of tomato plants submitted to NaCl salt stress.…”

Effet améliorateur d’un apport extérieur de calcium et de potassium sous différentes formes sur la tolérance à la salinité de l’amarante (Amaranthus cruentus L.)

“…Par ailleurs, plusieurs travaux ont révélé que la réduction de la croissance des plantes d'amarante sous l'effet de la salinité est principalement la conséquence de l'accumulation d'ions devenant toxiques (Na + et Cl -) pour les activités métaboliques de la plante (Omami, 2005 ;Odjegba et Chukwunwike., 2012). En effet, ces ions peuvent perturber la capacité de la plante à contrôler l'accumulation d'autres ions importants (Wouyou et al, 2019). Parmi ces ions, l'ion sodium (Na + ) occupe une place de choix.…”