Effect of Salicylic Acid Synergists on Rooting Softwood Cuttings of Poinsettia (Euphorbia pulcherrima)

Abstract

The poinsettia's species name pulcherrima means "most beautiful" and that it is. Poinsettia's brilliant red floral display held against rich green foliage has made this unlikely species a holiday favorite. Its appealing presentation of the traditional Christmas colors has so endeared poinsettia that it is now second only to the Christmas tree as the most popular holiday plant. Studies have shown that rooting substrate is one of the effective factors at rooting of hard rhizogenetic plant such as poinsettia. The purpose of this study is to determine an appropriate concentration of Salicylic Acid (SA) on rooting of poinsettia. Present study showed that there was a great variation in most of the measured characters at p<0.05 percent level. The obtained results showed that salicylic acid treatments have caused the increase of percent of rooting. The use of salicylic acid caused a positive effect on rooting. The callus percentage was obtained in control and 400 treatments. This study shows that plant growth regulator salicylic acid have a profound influence on rooting of poinsettia.

Salicylic Acid in Root Growth and Development

“…The genotype specificity of SA effective concentrations may explain the wide ranges reported to increase root length in tomato (0.1-100 µM) and rice (700 µM-1 mM) and to decrease root length in Arabidopsis (3-250 µM) [9,25,26,56,73,80,81,[124][125][126][127][128][129][130]. In most species, there are only a few papers reporting only decreases or only increases in root length after an SA treatment (Table S2) and similar SA doses may enhance (1 µM-5 mM) or suppress (0.7 µM-10 mM) root growth depending on the species [42,79,83,97,[131][132][133][134][135][136][137][138][139][140][141][142]. SA controls root growth by regulating root apical meristem (RAM) activity [12,25,143].…”

Effect of Spraying with Salicylic Acid and Okra Plant Extract on the Growth and Yield of Baashiqi Olive Trees

“…The reason for the excelled of salicylic acid spray treatment may be due to the fact that this acid contributes to increasing cell division and elongation within the plant tissues at the top of the plant, which is responsible for increasing plant growth, such as the increase in the length of the main branch, and chlorophyll [10][11][12].Salicylate also works to prevent and reduce oxidative processes in endogenous hormones through its direct effect on the encouragement and stimulation of auxin, and its purpose is to stimulate and increase cell division [13]. As well as its role in stimulating meristematic cells, starting from the growth of roots, and increasing the root hairs, and thus increasing and improving the traits of the root system of the plant, which in turn is reflected positively in increasing and improving the vegetative system [14,15]. This is consistent with what [16] said about olive seedlings, [17] about palm trees, [18,19], about olives.It may explain the role of waxy solutions or plant extracts that contain mucilage and have a similar effect to waxy substances, such as okra fruit extract, in improving vegetative growth characteristics (rate of increase in branch length and carbohydrate content), and its improvement of the water condition of the plant and its reduction of the rates of transpiration in the leaves is due to the effect of these materials physiologically as a material that prevents transpiration through the formation of a thin layer film covering the stomata and lenticels partially or completely on the surface of the leaf and this leads to preventing or reducing the penetration of water molecules and its evaporation and increases the moisture within the tissues the results consisted with [20][21][22].…”

Dopamine, Chlorogenic Acid, and Quinones as Possible Cofactors of Increasing Adventitious Rooting Potential of In Vitro Krymsk 5 Cherry Rootstock Explants

“…The enhancing effects of phenolics in ARF may be attributed to the "protection" of endogenous auxin from oxidation and decarboxylation [6,7,10], to the improvement of basipetal transportation of 3-indoleactetic acid (IAA) to the rooting zone [11] or to the conjugation with auxin, forming a complex more active than the auxin per se [12]. Reduced forms of phenolic compounds, such as chlorogenic acid, caffeic acid, catechol, ferrulic acid, salicylic acid, and others, have been tested for improving rooting potential, with various results [1,2,13,14] depending on the species or variety [2,15,16], the physiological condition of the cutting [16,17], and the type of compound used [2]. On the other hand, the oxidized products of phenolics (i.e., quinones) are not well studied for their role in ARF.…”