Hormesis and other non-monotonic growth responses in mung bean (Vigna radiata) seedlings treated with seaweed liquid extracts

Rosalba Mireya Hernández-Herrera, Gustavo Hernández-Carmona, Mauricio Muñoz-Ochoa

Research output: Contribution to journalArticlepeer-review


Hormesis and other non-monotonic growth responses have been observed in numerous plant species that are independent of biological or physicochemical agents, which may be potentially exploited to increase crop productivity. A dose–response study was performed on mung bean (Vigna radiata) by applying seaweed liquid extracts (SLEs) from Sargassum horridum (SH) and Gracilaria parvispora (GP) and blended seaweed extracts (BSEs) from these species (SHGP). Autoclave and water bath extraction were used to obtain the extracts which were applied to seedlings over a wide dose range to evaluate growth stimulation patterns. Shoot length, root length, and dry weight responded to the SLEs and BSEs in a hormetic and paradoxical manner. A biphasic dose–response confirmed the relationships between autoclave-extracted SLEs and shoot length and dry weight, which were due to the constituent properties of the SLEs. In contrast, plant roots treated with autoclave-extracted SLEs exhibited responses with maximums and/or minimums that were attributed to non-monotonic/non hormetic dose–response relationships (i.e., paradoxical effects). SLEs at all concentrations showed toxic effects (i.e., reduced root length), while the autoclave-extracted SHGP exhibited beneficial effects on root length. A physicochemical analysis indicated that the SLEs and BSEs contained significantly different amounts of different compounds. The PCA results indicated that four, clearly separate clusters were present among the mung bean plants from SLE and BSE treatments. The growth stimulation patterns found in this study will contribute to establishing safe application guidelines while providing a strong foundation for future research protocols to study the effects of SLEs and BSEs.

Original languageEnglish
JournalJournal of Applied Phycology
StatePublished - 11 Jun 2022


  • Biostimulant
  • Hormetic curve
  • Paradoxical manner
  • Plant trait


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