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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 73, No. 3, 2013, pp. 205-212
Bioline Code: cj13031
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 73, No. 3, 2013, pp. 205-212

 en Contrasting physiological responses to high salinity between two varieties of corn 'Lluteño' (salt tolerant) and 'Jubilee' (salt sensitive)
Carrasco-Ríos, Libertad; Rojas, Carla & Pinto, Manuel

Abstract

'Lluteño' is the only one corn capable to prosper in the Valley of Lluta under saline conditions (EC = 9.1 dS m-1). This cultivar has been little studied and there is no current information about its growth and about the possible mechanisms involved in its tolerance to salts. The aim of this research was to compare the growth of young plants of corn ( Zea mays check for this species in other resources L.) 'Lluteño' to that of the bred 'Jubilee', both grown under different salt concentrations, to characterize the absorption and distribution of Na+ and other nutrients in the plant and to evaluate the effect of the saline conditions in the osmotic adjustment in both cultivars. The plants of 21 d old were subjected for 15 d to two saline treatments: 50 and 100 mM NaCl. The accumulation of DM was reduced from 5.12 to 1.80 g plant-1 in 'Jubilee' and 5.53 to 4.12 g plant-1 in 'Lluteño' (P ≤ 0.05). 'Lluteño' showed to be more tolerant to salt stress that 'Jubilee' by greatest accumulation of biomass under saline conditions, it was associated with a lower accumulation of Na+, steadiness of K+ and Ca2+ content and accumulation of osmolytes in leaves. The latter affecting positively the maintenance of relative water content and the osmotic adjustment of this cultivar in the leaves.

Keywords
Ion content; osmotic adjustment; salt stress; Zea mays

 
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