Responses of Persian walnut on foliar applications of different biostimulants

Gergely Simon; Géza Bujdosó; Miljan Cvetkovic; Ozan Tevfik Alp; Laurine Kithi; Richárd Oláh; Gitta Ficzek; György Végvári

doi:10.3389/fpls.2023.1263396

Responses of Persian walnut on foliar applications of different biostimulants

Front Plant Sci. 2023 Oct 17:14:1263396. doi: 10.3389/fpls.2023.1263396. eCollection 2023.

Authors

Gergely Simon¹, Géza Bujdosó², Miljan Cvetkovic³, Ozan Tevfik Alp¹, Laurine Kithi², Richárd Oláh⁴, Gitta Ficzek¹, György Végvári⁵

Affiliations

¹ Department of Fruit Growing, Institute of Horticultural Sciences, Hungarian University of Agriculture and Life Sciences, Budapest, Hungary.
² Research Center of Fruit Growing, Institute of Horticultural Sciences, Hungarian University of Agriculture and Life Sciences, Budapest, Hungary.
³ Faculty of Agriculture, University of Banja Luka, Banja Luka, Bosnia and Herzegovina.
⁴ Aro-Peritum Ltd., Diósviszló, Hungary.
⁵ Faculty of Natural Sciences, Institute of Viticulture and Oenology, Eszterházy Károly Catholic University, Eger, Hungary.

Abstract

Biostimulants have different effects on plants. The aim of this paper is to determine responses of the 'Alsószentiváni 117' walnut cultivar on foliar applications of different biostimulants (Wuxal Ascofol, Kondisol, Alga K Plus). The nut traits (nut length, nut diameter, nut weight, kernel weight) and some phenolic compounds of the kernel were measured and detected. In 2020, during warmer early spring weather conditions under pistillate flowering receptivity, chlorogenic acid and quercetin content of kernels treated with Kondisol were higher than in control. All biostimulants influenced positive effects on catechin and rutin content, as well as treatments made with Wuxal Ascofol and Kondisol increased the juglon content of the kernel. In 2021, when the spring weather was typical for that period, only the Kondisol treatments had increasing effects on the catechin and chlorogenic acid content, than the control. The rutin and quercetin concentrations reached the highest value in this trial by Alga K Plus applications. The juglon content decreased in this year compared to the control. The pirocathecin, cinnamic acid, and gallic acid (except Wuxal Ascofol treatment in 2021) content decreased in all treatments in both observed years. Responses of woody fruit species on biostimulants applications depend on the weather conditions. Biostimulants had positive effects on the nut size characteristics in both observed years.

Keywords: HPLC; inner content value; kernel; nut characteristics; phenolic compounds.

Grants and funding

The authors declare financial support was received for the research, authorship, and/or publication of this article. The authors are grateful for the support of the project called “Creation of more tolerate a well as effective and economic pathways in plant protection and agro technology in the mechanized walnut orchards and vineyards using different cultivars” (project number: GINOP-2.1.2.-8-1-4-16-2018-0580 - Supporting of the companies’ R+D+I activities in the frame of combined credit products).