<i>Cladosporium</i> sp. Isolate as Fungal Plant Growth Promoting Agent
Iuliana Răut | Mariana Călin | Luiza Capră | Ana-Maria Gurban | Mihaela Doni | Nicoleta Radu | Luiza Jecu
<i>Cladosporium</i> species are active in protecting plants against different biotic and abiotic stresses. Since these species produced a wide range of secondary metabolites responsible for the adaptation to new habitats, plant health and performance, they are of great interest, especially for biostimulants in agriculture. <i>Cladosporium</i> sp. produces protein hydrolysates (PHs), a class of biostimulants, by cultivation on medium with keratin wastes (feathers) as carbon and energy sources. The aim of this study was to select a <i>Cladosporium</i> isolate with potential to be used as plant growth promoting agent. The characteristics of <i>Cladosporium</i> isolates as plants biostimulants were evaluated through several tests, such as: antagonism versus plants pathogens, effect on plant growth of secreted volatiles produced by isolates, secretion of hydrolytic enzymes, production of 3-indole acetic acid, zinc and phosphorous solubilization, capacity to promote tomato seedlings growth (pot experiments). <i>Cladosporium</i> isolate T2 presented positive results to all tests. Encouraging results were obtained treating tomato seedlings with PHs from isolate <i>Cladosporium</i> T2 cultured on medium supplemented with 1% (<i>w</i>/<i>w</i>) chicken feathers, for which growth parameters, such as stem weight, stem height, and root weight were significantly higher by 65%, 32%, and 55%, respectively, compared to those treated with water.
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