Effect of an auxin-like herbicide 2,4-dichloro phenoxy acetic acid on proline content of mesquite (Prosopis juliflora Swarz) DC
Eltayeb Ahmed Hamad Suliman, Salah Eltom Elamin and Sayda Omer Elhewairis
2,4-dichloro phenoxy acetic acid (2,4-D), known as auxin-like herbicide or synthetic auxin, mimic the effect of the natural auxin indole-3-acetic acid (IAA). Afield and laboratory experiments were arranged to study the effect of (2,4-D) on the proline content of leaves of natural stand mesquite trees (Prosopis juliflora) treated with 2,4-D at different rates (0, 6×103, 12×103, 18×103 and 24×103 mg a. i. / L). Herbicide rates dissolved in two solvents (diesel or water), which 2,4-D mixtures sprayed around the lower part of the tree stem. The experiment designed in the factorial experiment in Randomized Complete Block Design (RCBD) with three replicates. The results showed that: High rate of 2,4-D (24×103 mg) gave a high concentration of proline, which gave 115,59 and 108,10 mg/g.: 142.25 and 145.60 mg/g in the two winter, and two rainy seasons, respectively. In both winter seasons leaves proline increased as the 2,4-D concentration increased dissolved in diesel with the three sizes, while in both rainy seasons, all 2,4-D concentrations dissolved in water or diesel increased proline content compared to the control. The results in this research confirmed that: 2,4-D herbicide led to a significant increase in leaves proline content of mesquite trees to a degree that lead to toxicity of the tree, which is one of the mechanisms of action of auxin overdose.
Eltayeb Ahmed Hamad Suliman, Salah Eltom Elamin, Sayda Omer Elhewairis. Effect of an auxin-like herbicide 2,4-dichloro phenoxy acetic acid on proline content of mesquite (Prosopis juliflora Swarz) DC. J Med Plants Stud 2023;11(1):175-179. DOI: 10.22271/plants.2023.v11.i1c.1525