Abstract
The objective of this research was to quantify the photosynthetic efficiency of Cedrela fissilis and Schinus terebinthifolius seedlings after application of salicylic acid for eight weeks. The experimental design was completely randomized, composed of four treatments, with five replicates of 20 seedlings each. The treatments consisted of increasing doses of the salicylic acid solution: 0, 100, 200, 300 mg L-1. The solution was composed of salicylic acid, deionized water and adjuvant and applied with hand sprayer, weekly for 2 months. The parameters evaluated after the application of the acid consisted of the rate of CO2 assimilation, leaf transpiration, stomatal conductance and internal CO2 concentration, as well as water use efficiency, intrinsic water use efficiency and instantaneous carboxylation efficiency. In seedlings of Schinus terebinthifolius there was a reduction of the photosynthetic parameters and consequently a better use of water as the doses of the plant growth regulator were increased. In the seedlings of Cedrela fissilis the dose of 200 mg L-1 resulted in greater CO2 fixation per molecule of water lost and in this sense, it can be inferred that the increase in the doses of salicylic acid improved the photosynthetic efficiency, but the use of water was lower. Thus, for both species, lower doses are more recommended because there must be a balance between the fixed amount of CO2, the plant generated from photoassimilates and the amount of water lost, in order not to generate a negative potential in the plant metabolism.
Highlights
The use of native wood species adds great commercial and social value to the environment in which they are inserted
Seedlings of S. terebinthifolius receiving Salicylic acid (SA) for eight weeks resulted in a reduction in internal CO2 concentration, stomatal conductance and transpiration, but increased water use efficiency and the intrinsic efficiency of water use, demonstrating that the doses tested favored the use of water, but reduced assimilation and production of CO2 and, the contribution of photoassimilates
It is interesting to note that photosynthetic reduction is a strategy of the terrestrial plants to avoid stressful conditions and may be advantageous provided that this situation occurs quickly, not significantly affecting the normal metabolism of the plants
Summary
The use of native wood species adds great commercial and social value to the environment in which they are inserted. In this sense, it is of great interest to increase the production of large scale and better quality seedlings. Studies focusing on the potential, uses, establishment, development, practices and management in the nursery and in the field should be developed (Gonçalves et al, 2012). Among the characteristics of the species, it is considerd a pioneer species with rusticity and great phenotypic plasticity, and has great potential of use in programs of environmental reforestation and revegetation of degraded areas (Carvalho et al, 2013). Aroeira is used for fodder of bees and goats, as raw material for fences and as an ornamental plant, as well as cosmetic, food and habitat restoration (Carvalho et al, 2015; Nickerson & Flory, 2015)
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