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Shah, Z.H., Rehman, H.M., Akhtar, T., Alsamadany, H., Hamooh, B., Mujtaba, T., Daur, I., Alzahrani, Y., Alzahrani, H.A.S. and Ali, S. (2018) Humic Substances: Determining Potential Molecular Regulatory Processes in Plants. Frontiers in Plant Sciences, 9, Article 263.
https://doi.org/10.3389/fpls.2018.00263

has been cited by the following article:

• TITLE: Comparative Evaluation of Humic Substances: Effect at Cell Level and Chlorophyll Retention during Accelerated Senescence

  AUTHORS: Tirichy Ganesh Prasad, Joz Liza, Bargur Jayaram Manjushree, Ramarao Nagalakshmi, Kumar Devendra

  KEYWORDS: Biostimulants, Chlorophyll, Compost, Cotyledon, Humic Substances, Hypocotyl, Sedimentary

  JOURNAL NAME: American Journal of Plant Sciences, Vol.14 No.6, June 27, 2023

  ABSTRACT: The influence of humic substances (HS) formulations derived from sedimentary and compost sources was studied on plant growth at cell level and chlorophyll retention during accelerated senescence of leaf tissue. The direct effect of HS formulations was studied on cell expansion using cucumber and radish cotyledon expansion test. The cucumber hypocotyl elongation test was used to study the effect on cell elongation. Chlorophyll pigment retention in excised leaf tissue incubated in dark with high temperature was assessed to study the effect on leaf senescence. Explant tissues were incubated directly in the solutions of the formulations at the concentration recommended for foliar application to the crop plants. HS formulations showed significant variations in their direct bio-stimulatory effects. Formulations derived from compost sources were found superior in terms of inducing a direct stimulatory effect on cell expansion and cell elongation and in maintaining chlorophyll pigment retention during accelerated senescence. HS from sedimentary sources stimulated cell expansion and delayed chlorophyll degradation to a lesser extent compared to HS from compost. However, HS formulations derived from sedimentary sources used in this study were not effective in inducing cell elongation in the cucumber hypocotyl elongation test. The direct bio-stimulatory effect of HS formulations differed significantly between the formulations that were evaluated.