Abstract

ORTIZ TORRES, César et al. Effect of different types of salts on the development of Pinus greggii var. australis saplings. Madera bosques [online]. 2023, vol.29, n.1, e2912490.  Epub Nov 24, 2023. ISSN 2448-7597.  https://doi.org/10.21829/myb.2023.2912490.

The effect of salts on the development of Pinus greggii var. australis samplings was studied for 172 days. Three types of salts: chloride, sulfate, and sulfate-sodium were tested along with a control treatment of distilled water. Electrical conductivities for each salt were 3 dS m-1, 6 dS m-1, 9 dS m-1, and 12 dS m-1. Trajectories of diameter and height increments were analyzed. At the end of the experiment, treatments were compared according to the total increments in diameter and height, root biomass, and the Dickson quality index, in addition to observing first-order root cross sections by scanning electron microscopy (SEM). Treatments with salinity levels of 3 dS m-1 for all types of salts were those that least affected sapling growth, while chloride salt with 12 dS m-1 was the one that most affected sapling growth. On the other hand, SEM images showed that no starch granules were present in the root section of the cortex when treated with salinity levels of 12 dS m-1, while they were present in the control treatment. These results suggest that P. gerggii var. australis tolerates salinity levels lower than 3 dS m-1 and its growth is affected when salinity levels increase, generating poor plant standards.

Keywords : starch; chloride; sulfate; microscopy; salinity; sulfate-sodium.

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