Biochemical and Physiological Modifications in Seedlings of Schinus terebinthifolius Raddi. After Hardening with Salicylic Acid

Abstract

Exogenous application of stress inductors can facilitate and accelerate some biological responses that promote plant defense. The objective of the experiment was to quantify some compounds linked to nitrogen metabolism as a function of the application of salicylic acid in Schinus terebinthifolius seedlings submitted to water deficit. The experiment was constituted of four doses of salicylic acid and three periods of water deficit. Quantifications included levels of nitrate, free ammonium, total soluble amino acids, proteins, proline, glycine-betaine and relative water content. When evaluating the relative water content in seedlings of Schinus terebinthifolius at 8 days, it was observed that the dose of 200 mg L^-1. Seedlings showed physiological responses when subjected to doses of salicylic acid of 200 and 300 mg L^-1. The increase in concentration of proline and glycine are advantageous, because these substances act as osmoregulators and cell protectors against deficit hydrical.

Keywords:
Forest species; Free ammonium; Nitrate; Water deficit