Physiological and agronomical responses of common bean subjected to tryptophol

Abstract

With the increasing global demand for food, fuel and fibre, the use of plant growth regulators in agriculture has become an agricultural practice aimed to improve physiological and productive responses. Our work aimed to evaluate the effect of tryptophol (Tol), a precursor of auxin, on common bean (Phaseolus vulgaris L.). The experiment was conducted in pots under greenhouse conditions, where we evaluated the Tol effect on bean crop under two different application forms: T Soil -soil application of Tol (4.10 −4 mg L −1 ) and T Leaf -leaf tryptophol application (4.10 −4 mg L −1 ), plus a reference treatment (0 mg L −1 of Tol). We analysed the variables: shoot fresh and dry matter; root dry matter, area and volume; leaf macro and micronutrients; CO 2 net assimilation rate (A); stomatal conductance (g S ); internal CO 2 concentration (C I ); foliar transpiration (E); photosynthetic pigment content and some crop production attributes. The application of Tol through the foliar pathway proved to be more advantageous because it improved the shoot fresh and dry matter, increased the root volume and area, favoured less foliar transpiration and improved the length of pods, while the application of Tol in soil induced higher nitrogen accumulation in leaves. Our observations allow the characterization of Tol as a bioactive metabolite, suggesting an important potential for use in agricultural systems.

Waterlogging effects upon the phenological phases of common bean cultivar BRSMG-Uai

“…Gas exchange was measured utilizing an infrared gas analyzer (IRGA -LI6400XT Portable Phostosynthesis System, LI-COR, Lincoln, USA) and taking the central leaflet of the most recently expanded trifoliated leaf of the plants. All the measurements were conducted in clear days, between 9:30 a.m. and 10:30 a.m. We evaluated net photosynthesis (A), stomatal conductance (gs) and transpiration (E) with a photosynthetic active radiation (PAR) of 1,200 μmol m -2 s -1 (Nascimento et al, 2016). The mean leaf temperature in three days of measurements was 29.6 ± 1.9 ºC, the relative humidity (RH) of the chamber was 49.6 ± 7.9% and the CO 2 partial pressure was 42 ± 7 Pa.…”

Tryptophol Improves the Biocontrol Efficacy of Scheffersomyces spartinae against the Gray Mold of Strawberries by Quorum Sensing

“…Tryptophol is an indole derivative with a wide range of activities, which can promote the growth of plant roots and leaves 19 and show antimicrobial activity against food contaminants, such as Salmonella enteritidis. 20 In S. cerevisiae, tryptophol acts as a quorum-sensing molecule to increase the ethanol production.…”

Integrated Multi-Omics Analyses Reveal the Molecular Basis of Tryptophol Over-Accumulation in Saccharomyces Cerevisiae

“…For instance, TOL is able to induce apoptosis in human leukaemia U937 cells without affecting normal lymphocytes [2], and can attenuate pathogen-induced in ammation-related responses of the cytokines TNFα and IFNγ [3]. In addition to the potential bioactivity for humans, TOL is a growth promoting factor for roots and leaves of plants [4]; it can inhibit viral replication of white spot syndrome of the shrimp Marsupenaeus japonicus [5], and it possesses antimicrobial activity against the food contaminants Campylobacter jejuni [6] and Salmonella enterica [7]. Therefore, research on TOL biosynthesis and regulation has attracted widespread attention.…”