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Molina, Jeanmaire; Nikolic, Dejan; Jeevarathanam, Jashvanth Raaj; Abzalimov, Rinat; Park, Eun-Jung; Pedales, Ronniel; Mojica, Elmer-Rico E.; Tandang, Danilo; McLaughlin, William; Wallick, Kyle; Adams, James; Novy, Ari; Pell, Susan K.; van Breemen, Richard B.; Pezzuto, John M.
Planta, 01/2022, Volume: 255, Issue: 1Journal Article
Main conclusion Metabolites in Rafflesia -infected and non-infected Tetrastigma were compared which may have applications in Rafflesia propagation. Benzylisoquinoline alkaloids, here reported for the first time in Vitaceae, were abundant in non-infected shoots and may be a form of defense. In Rafflesia -infected shoots, oxylipins, which mediate immune response, were elevated. Endemic to the forests of Southeast Asia, Rafflesia (Rafflesiaceae) is a genus of holoparasitic plants producing the largest flowers in the world, yet completely dependent on its host, the tropical grape vine, Tetrastigma . Rafflesia species are threatened with extinction, making them an iconic symbol of plant conservation. Thus far, propagation has proved challenging, greatly decreasing efficacy of conservation efforts. This study compared the metabolites in the shoots of Rafflesia -infected and non-infected Tetrastigma loheri to examine how Rafflesia infection affects host metabolomics and elucidate the Rafflesia infection process. Results from LC–MS-based untargeted metabolomics analysis showed benzylisoquinoline alkaloids were naturally more abundant in non-infected shoots and are here reported for the first time in the genus Tetrastigma, and in the grape family, Vitaceae. These metabolites have been implicated in plant defense mechanisms and may prevent a Rafflesia infection. In Rafflesia -infected shoots, oxygenated fatty acids, or oxylipins, and a flavonoid, previously shown involved in plant immune response, were significantly elevated. This study provides a preliminary assessment of metabolites that differ between Rafflesia -infected and non-infected Tetrastigma hosts and may have applications in Rafflesia propagation to meet conservation goals.
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