Bioactive compound isolated from Conyza canadensis combined with physical treatments for the control of green mould in Orange

Abstract

Orange (Citrus sinensis L. Osbeck) plays an important role among Brazilian fruits, with a yearly yield of around 17 million tons in an area of approximately 600,000 ha, representing revenues of U$ 2 billion per year. Brazil exports 30,000 tons of fresh oranges and more than 1 million tons of fresh juice per year, placing the country as the world's leading exporter of orange juice, representing 85% of the global market (Revista Agrobrasil, 2020).Green mould, caused by Penicillium digitatum (Pers.) Sacc, is the major postharvest disease in citrus in all producing countries, and its occurrence depends on climatic conditions and fruit handling, from the orchard to the arrival at the end consumer. The onset of symptoms occurs mainly during storage and transport, reducing both the quality and quantity of marketable fruits (Terao et al., 2017).Currently, the widely used way to control these losses is through the application of fungicides in postharvest treatments, which can leave toxic residues in the fruit (Hjorth et al., 2011). Therefore, the availability of clean technologies and alternatives to the use of fungicides is essential. Among them, bioactive compounds obtained from plants, as well as physical treatments, such as hot water treatment and UV-C radiation, stand out.

(4Z)-Lachnophyllum Lactone, an Acetylenic Furanone from Conyza bonariensis, Identified for the First Time with Allelopathic Activity against Cuscuta campestris

“…Previously, (4Z)-lachnophyllum lactone isolated from Conyza canadensis showed phytotoxic activity against Lactuca sativa, Agrostis stolonifera and Lemna paucicostata [26]. Furthermore, (4Z)-lachnophyllum lactone has reported fungitoxic activity against the fungi causing postharvest diseases in strawberry, i.e., Colletotrichum acutatum, C. gloeosporioides and C. fragariae [26], and causing postharvest diseases in citrus, i.e., Penicillium digitatum [43]. Fungitoxic activity against Pyricularia oryzae was identified in lachnophyllum lactone isolated from Erigeron apiculatus [44].…”