Abstract
Exogenous application of organic acids in maize seedlings under salt stress.
Highlights
Maize (Zea mays L.) is sensitive to salt stress, with salinity threshold of 1.1 dS m-1 in irrigation water and 1.7 dS m-1 in soil saturation extract (Ayers and Westcot, 1985)
The maize genotypes BRS 2022 and Potiguar were subjected to low-salinity water (0.5 dS m-1), high-salinity water (7.0 dS m-1), salt stress plus gibberellic acid in post-emergence (50 μmol), salt stress plus salicylic acid in post-emergence (50 μmol) and salt stress plus ascorbic acid in post-emergence (50 μmol)
For the genotypes BRS 2022 and Potiguar, seedling length was reduced by 14.2 and 20.1% as water salinity increased from 0.5 dS m-1 to 7.0 dS m-1, respectively (Figure 1A)
Summary
Maize (Zea mays L.) is sensitive to salt stress, with salinity threshold of 1.1 dS m-1 in irrigation water and 1.7 dS m-1 in soil saturation extract (Ayers and Westcot, 1985). The maize genotypes BRS 2022 and Potiguar were subjected to low-salinity water (0.5 dS m-1) (control), high-salinity water (7.0 dS m-1) (salt stress), salt stress plus gibberellic acid in post-emergence (50 μmol), salt stress plus salicylic acid in post-emergence (50 μmol) and salt stress plus ascorbic acid in post-emergence (50 μmol). The interaction was significant (p < 0.05) between the exogenous application of organic acids and maize genotypes for the length, dry mass and root/shoot ratio of maize seedlings (Figures 1 and 2).
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